Larscom ACST-1500B Series Installation And Operation Manual

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Page 1 (217) 352-9330 | Click HERE Find the Larscom Access-T-201 at our website:...
Page 2 Access-T 100, 200, 400, & 1500 Multi-port DSU/CSU System Installation and Operation Manual ACST-0351-005 June 1996...
Page 3 NOTICE Specifications and performance characteristics described in this document are subject to change without notice. Access-T is a trademark of Larscom Incorporated. Larscom Incorporated 4600 Patrick Henry Drive Santa Clara, CA 95054 Telephone: (408) 988-6600 Customer Service: (408) 988-6627 Fax: (408) 986-8690 World Wide Web: http://www.larscom.com...
Page 4 Always return Access-T to the factory if repair is required. 7. Do not remove equipment housing unless you are a qualified installer. There are no user-servicable parts inside. The Larscom Access-T must be installed by a qualified technician.
Page 5 ACST-0351-005 Access-T June 1996 Contents Notice to Canadian Users The Industry of Canada label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational, and safety requirements. The Department does not guarantee the equipment will operate to the user’s satisfaction.
Page 6 Warning Changes or modifications to this unit not expressly approved by Larscom could void the user’s authority to operate the equipment.
Page 7 T1 CSU (and thus is equivalent to an Access-T Series 200); integral SNMP; one supervisory connection serves all modules. This manual describes the functions and capabilities of the Larscom Access-T Series 100, 200, 400, and 1500 products. Although identical in software, these two versions of the product have significant physical differences, which are noted throughout this manual as appropriate.
Page 8 Chapter 1 ACST-0351-005 Introduction June 1996 Access-T installers and operators should be familiar with the information presented in this manual, which is divided into the following 10 chapters: Chapter 1. Introduction — This chapter provides general technical information about T1 and FT1 networks and the Simple Network Man- agement Protocol (SNMP).
Page 9 Introduction Appendix C. CP01 Chain Port Expander — This appendix describes the Larscom CP01 Chain Port Expander, which can link the RS485 facilities connecting multiple Access-Ts to the supervisory master via RS232 ports. Appendix D. Access-T Operator Messages — This appendix lists all Access-T status and error messages.
Page 10: Customer Premises Equipment
Chapter 1 ACST-0351-005 Introduction June 1996 Customer Premises Equipment Various types of equipment are employed at the customer’s location. Digital Terminating Equipment (DTE) provides the source for the transmitted signal and the destination for the received signal. DTE includes such equipment as: •...
Page 11: Transmission Facilities
ACST-0351-005 Chapter 1 June 1996 Introduction Transmission Facilities T1 signals are transmitted primarily over standard twisted-pair copper wire. Signal loss on the wire is approximately 5 or 6 dB per 1000 feet. Repeaters are employed every 6000 feet along the transmission facility to compensate for the signal losses and to ensure an adequate signal level at the Network Interface (the termination of the T1 line at the customer premises).
Page 12 Chapter 1 ACST-0351-005 Introduction June 1996 Pulse Density To interpret and regenerate a T1 signal, repeaters and other T1 equipment must be able to determine time slots based on the pulses in the received signal. Since pulses occur only when ONES are transmitted, signals with too many consecu- tive ZEROS cause timing problems.
Page 13 ACST-0351-005 Chapter 1 June 1996 Introduction Clear Channel Capability The primary drawback of pulse stuffing is that it corrupts the original data. This is not a problem with voice transmissions, where the effect on the sound reproduced at the receiving end is negligible. In data transmissions, however, changing a single bit can have serious consequences.
Page 14 Chapter 1 ACST-0351-005 Introduction June 1996 8 consecutive ZEROS Received Bits Transmitted Bits Transmitted Signal Notes: Transmitted polarities are reversed if last ONE received was negative. Bipolar violations always occur at 4th and 7th bit positions. Figure 1-3. B8ZS Encoding Framing Formats Two framing formats are used in today’s T1 networks: D4 and ESF.
Page 15 ACST-0351-005 Chapter 1 June 1996 Introduction With ESF, the D4 Superframe is extended from 12 to 24 frames (4632 bits). The 8 kbps of overhead is divided into three separate channels: • A 2 kbps channel for framing. • A 2 kbps channel for CRC-6, a six-bit Cyclic Redundancy Check code for each ESF which is separately calculated by the transmitter and the receiver and then compared to detect bit errors “on the fly”.
Page 16 Chapter 1 ACST-0351-005 Introduction June 1996 1 Superframe = 12 Frames 1.5 milliseconds, 2316 bits Combined F Frame # 1 Frame 125 microseconds, 193 bits Channel # F 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 Bit 3 1 2 3 4 5 6 7 8 F 1 2 3 4 5 6 7 8...
Page 17 ACST-0351-005 Chapter 1 June 1996 Introduction Table 1-A. ESF Format Overhead Bits Bit Use, All 24 Channels Signaling Bit Use Options (1 bit per frame) (192 bits per frame) (see Notes below) Frame Traffic Signaling Number — — Bits 1-8 —...
Page 18 Chapter 1 ACST-0351-005 Introduction June 1996 The AT&T Standard for ESF AT&T Publication 54016 (revised 1989) defines the performance-monitoring and data-link requirements for ESF CSUs. Per the latest revision of Publication 54016 (September 1989), the following performance parameters must be monitored: •...
Page 19 ACST-0351-005 Chapter 1 June 1996 Introduction The ANSI Standard for ESF The ANSI T1-403 standard (informally called T1E1 after the committee involved in its formulation) defines performance-monitoring and data-link features which are significantly different than those defined by AT&T in Publication 54016.
Page 20 Chapter 1 ACST-0351-005 Introduction June 1996 Bits Word 1 Word 2 G1 = 1 1 CRC Error Event G2 = 1 2 to 5 CRC Error Events G3 = 1 6 to 10 CRC Error Events G4 = 1 11 to 100 CRC Error Events G5 = 1 101 to 319 CRC Error Events G6 = 1...
Page 21 ACST-0351-005 Chapter 1 June 1996 Introduction Fractional T1 Services In a traditional T1 network, the customer leases a T1 link between two locations. The entire T1 bandwidth of 24 DS0s is transmitted from one customer location to another. In a Fractional T1 (FT1) network, a customer can lease a subset of the 24 DS0s on a T1 link.
Page 22: Simple Network Management Protocol (Snmp)
Figure 1-7 illustrates a typical use of SNMP to manage wide-area network interfaces. In this application, the SNMP manager is managing Larscom’s Access-Ts, which provide an interface to a T1 network. The SNMP manager could be the Larscom EMS™, the HP OpenView™, or the SunNet Manager™. 1-16...
Page 23: Snmp Interface
ACST-0351-005 Chapter 1 June 1996 Introduction Access-T Access-T T1 Network RS232 RS232 (SLIP or PPP) (SLIP or PPP) Terminal Server Terminal Server Gateway LAN Segment LAN Segment Gateway SNMP Gateway Manager LAN Segment LAN Segment Gateway Terminal Server Terminal Server RS232 RS232 (SLIP or PPP)
Page 24: Snmp Operation
Chapter 1 ACST-0351-005 Introduction June 1996 SNMP Operation SNMP uses the TCP/IP protocol suite to exchange packetized messages between a management Client, the SNMP manager, and an Agent, residing in a network node, such as the Access-T. These packetized messages are transferred, as IP datagrams, over a packet-network, referred to as an internet.
Page 25: Management Information Base (Mib)
SNMP-managed device to the SNMP manager to report an event or an alarm condition. Larscom provides a DOS-formatted disk that includes the Larscom private MIB and the standard 1406 MIB. Refer to Appendices F, G, and H for more information about the different MIB components supported by Access-T.
Page 26 SNMP messages (i.e., GET or SET requests or replies) are exchanged between an SNMP manager (i.e., the client) and an SNMP-managed device (i.e., the agent, such as Larscom’s Access-T), it is helpful to know something about the TCP/IP protocol suite.
Page 27 ACST-0351-005 Chapter 1 June 1996 Introduction In the Figure 1-8, an SNMP message (i.e., a GET or SET request) from the SNMP manager to the Access-T device, is passed down through the protocol stack, across the link layer and up through the protocol stack at the Access-T. On the message’s way down through the protocol stack, each layer adds information to the message by prepending headers (and sometimes trailers).
Page 28 Chapter 1 ACST-0351-005 Introduction June 1996 IP Addressing The goal of TCP/IP is to provide a virtual network that offers a connectionless IP datagram delivery service. To understand how this is achieved, it is important to understand how a TCP/IP internet addresses each IP datagram and routes it through the network.
Page 29: Subnet Addressing
ACST-0351-005 Chapter 1 June 1996 Introduction 0 1 2 3 4 Class A netid hostid Class B netid hostid Class C netid hostid Class D multicast address Class E 1 1 0 reserved for future use Figure 1-9. Five Forms of Internet Addresses Subnet Addressing Class B addresses, for instance, can support 2 (65,536) hosts.
Page 30: Subnet Mask
Chapter 1 ACST-0351-005 Introduction June 1996 Figure 1-10 shows a subnet mask for a Class B address. In the figure, the subnetid and the hostid fields are not separated on byte boundaries. The subnetid field is 10 bits, and the hostid field is 6 bits. Dotted Decimal Notation When IP addresses are used in application programs or technical documenta- tion, they need to be written in a form users can understand.
Page 31 ACST-0351-005 Chapter 1 June 1996 Introduction Internet Routing In a packet switching system, routing refers to the process of choosing a path over which to send packets (IP datagrams), and router refers to a computer making such a choice. Both hosts and gateways participate in IP routing, which can be divided into two forms: direct routing and indirect routing.
Page 32 Chapter 1 ACST-0351-005 Introduction June 1996 20.0.0.5 30.0.0.6 40.0.0.7 Network Network Network Network 10.0.0.0 20.0.0.0 30.0.0.0 40.0.0.0 10.0.0.5 20.0.0.6 30.0.0.7 To reach hosts Route to on network this address 20.0.0.0 Deliver Directly 30.0.0.0 Deliver Directly 10.0.0.0 20.0.0.5 40.0.0.0 30.0.0.7 Figure 1-11. Using a Routing Table to Send IP Datagrams Between Networks 1-26...
Page 33 ACST-0351-005 Chapter 1 June 1996 Introduction Constraints of Operating Access-T with SNMP The following constraits exist when operating Access-T when SNMP manage- ment is implemented: • Access to the normal terminal interface screen may be denied de- pending on the type of device attached to the Supervisory port. •...
Page 34: Equipment Architecture
Access-T Functional Overview Access-T Functional Overview The Larscom Access-T combines the features of a multiplexer, a multi-port DSU, and a T1 CSU to help you take full advantage of today’s T1 and Fractional T1 (FT1) networks. A T1 network interface (and an auxiliary T1 DTE), multiplexed DTE ports (up to 4), user-controlled DS0 bundling, and integral SNMP agent make Access-T ideally suited for your continuously growing network needs.
Page 35 Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 The Access-T 1500 provides: • One chassis which can house up to two power supplies and 15 Access-T modules (cards). • Two DTE ports (per module). • Supervisory Port (per chassis). • Craft Port (per chassis).
Page 36 ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview Up to four DTE ports support equipment communicating at any multiple of 56 or 64 kbps, to a total of twenty-four 56 or 64 kbps channels. Access-T makes networking simpler and more economical in many ways: •...
Page 37: Master/Slave Operation
Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Master/Slave Operation Each Access-T is configured by the user to operate in one of two modes: • Master. • Slave. When two or more Access-Ts are “chained” (via the RS485 Chain Port, described later in this chapter), all units can be controlled from a single terminal (or NMS) connected locally or remotely to a Supervisory or Craft Port.
Page 38 ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview Command Ports and Interfaces Access-T provides a variety of command ports and interfaces to provide com- plete management control. Definitions for port and interface are as follows: • A port consists of the physical connector hardware and a minimal amount of I/O software.
Page 39: Terminal Interface
Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Terminal Interface Access-T can be controlled via a VT100 or TV 925 terminal. The ASCII Terminal Interface features a Title Bar, Main Menu Line, and Menu and Report Display Area. The Title Bar is a one-line, 80-character-wide status bar at the top of the terminal display.
Page 40: Point-To-Point Protocol (Ppp)
ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview Serial Line Interface Protocol (SLIP) The Supervisory Port can be configured as a SLIP interface. The SLIP interface, which is described in RFC 1055, is responsible for encapsulating SNMP (i.e., IP) datagrams. In other words, SLIP defines a sequence of characters that frame SNMP datagrams on an RS232 serial line.
Page 41: Supervisory Port
Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Supervisory Port The Supervisory Port supports direct or modem connection to a terminal or Network Management System (NMS). Located on the rear panel and labeled , the Supervisory Port is intended for permanent installations. SUPV PORT Operating parameters for the Supervisory Port are user-selected via the Access-T software.
Page 42: Expander Port
Access-Ts. In the latter case, the NMS must poll the slaves; there will be no master Access-T, and no alarm dialout. For these unusual applications, a Larscom CP01 Chain Port Expander can be used to convert theRS485 port to RS232. See Appendix C for more information on the Larscom CP01.
Page 43 Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 RS485 2-Wire Facilities Communicating Using TABS RS232 Access-T Series Access-T Series Access-T Series 100, 200, or 400 100, 200, or 400 100, 200, or 400 TERMINAL OR NMS MASTER SLAVE SLAVE A. Interconnecting Access-T 100, 200, and/or 400 Units Using the RS485 Chain Port RS485 2-Wire Facilities RS232 Communicating Using TABS...
Page 44: Dte Interfaces
Clock, as shown in Figure 2-3. Each port employs a female DB25 connector supporting the EIA 530 standard. Larscom offers adapter cables to convert to DC37 (RS449) or MS34 (V.35) connectors. The pulse density required for T1 transmissions can be assured in several ways: •...
Page 45 Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Pin 14 Transmit Data Access-T Pin 15 Transmit Clock (required Pin 11 Phase- External Clock DTE wiring) Locked Pin 17 Loop Receive Clock Pin 3 Receive Data V.35 or RS449 Port 1 or Port 2 Interface (V.35/RS449) In terminal timing mode, Transmit Data is clocked into the Access-T by the External Clock.
Page 46 An adapter is available to convert to an RJ48 jack. Access-T 1500 units employ two 50-pin male RJ48H connectors. Larscom offers an accessory kit that consists of two standard 50-pin female AMP CHAMP connectors. You must connect the leads for each Aux connection to support your cabling configuration.
Page 47: Network Interface
Access-T 1500 units employ two 50-pin female RJ48H connectors. Each connector provides network access for specific Access-T modules (slot positions). Larscom provides a separate RJ48C connector for each T1 line interface via a Patch Converter Panel accessory kit, as described in Appendix E.
Page 48 ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview DS0 Bundling DS0s from the DTE can be “bundled” as desired. In other words, each 56 or 64 kbps time slot from a DTE can be assigned to any DS0 from 1 to 24 on the network.
Page 49: Performance Monitoring
Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Performance Monitoring Access-T maintains several 24-hour registers, including those required by AT&T Publication 54016. Via the Access-T command interfaces, you can exam- ine the register contents for the following performance parameters: • Errored Second (ES).
Page 50 ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview In ESF mode, Access-T can obtain telco register contents from the far-end Access-T (or other ESF device) via the FDL. These register contents can be reported via the command interfaces. Alarms Access-T allows the operator to enable alarm generation individually for up to 23 conditions.
Page 51 Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Line/Aux Alarms Alarms for the Line and Aux ports are: • Bipolar Violations (BPVS): A bipolar violation occurs when con- secutive ONES pulses have the same polarity. This alarm is registered at the Access-T when the BPV threshold, defined by the operator, is exceeded.
Page 52: Chassis Alarms
ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview Chassis Alarms Chassis alarms pertain to failures that affect the overall operation of Access-T. There are three chassis alarms: • Loss of Master Clock (MSTR CLK LOSS): Access-T has lost its master clock signal.
Page 53 Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Loopbacks To help you quickly isolate problems within the network, Access-T provides several basic loopback modes illustrated in Figure 2-6. These loopbacks assist in diagnosing problems that occur along the various portions of the end-to- end communication links.
Page 54 ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview Figure 2-6. Access-T Loopback Paths 2-21...
Page 55 Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 DTE Channel Loopbacks This section describes the loopbacks available at the individual DTE channels. The circled number corresponds to the loopback path illustrated in Figure 2-6. Channel-Side DTE (CS DTE) Loopback When a CS DTE loopback is in effect, the signal from the DTE is looped back to the DTE at the Channel Interface connector.
Page 56 ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview Data-Side Line (DS Line) Loopback When a DS Line loopback is in effect, the T1 payload is re-framed and transmit- ted to the network using the recovered clock. (DS Line is often referred to as the payload loopback.) DS Line loopbacks provide for end-to-end testing, including Access-T’s line interface.
Page 57: Remote Loopbacks
Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Remote Loopbacks Remote loopbacks are commanded to the far-end through the FDL or in-band codes. Each remote loopback corresponds to a local loopback. Loopbacks com- manded via the FDL are not available in the D4 framing mode. Remote Line Loopback The Remote Line loopback corresponds to the LS Line loopback at the local Access-T.
Page 58 ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview Test Pattern Monitoring Access-T provides a framed QRSS test pattern for testing looped or end-to-end circuits. QRSS (Quasi-Random Signal Source) is a repeating pattern of 2 (1,048,575) bits which simulates “live” data. The QRSS test pattern can be transmitted over the entire T1 bandwidth, mapped into the DS0s assigned to a specified DTE port or aux port, or mapped into all idle DS0s.
Page 59: Models And Specifications
Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Service Ordering When ordering T1 service, provide the telephone company with the information given in Table 2-A. Models and Specifications Access-T model numbers and specifications are provided in Table 2-B. Table 2-A. Service Ordering Information Service Code 6.0N Facility Interface Code...
Page 60 ACST-0351-005 Chapter 2 June 1996 Access-T Functional Overview Table 2-B. Specifications Model Numbers ACST-101 Chassis with 1 DTE Port, ac power ACST-102 Chassis with 1 DTE Port, dc power ACST-111 Chassis with 1 DTE Port, with drop-and-insert, ac power ACST-112 Chassis with 1 DTE Port, with drop-and-insert, dc power ACST-201 Chassis with 2 DTE Ports, ac power...
Page 61 Chapter 2 ACST-0351-005 Access-T Functional Overview June 1996 Table 2-B. Specifications (cont’d) Supervisory Access Craft/Supervisory Port 100, 200, and 400 units RS232 ASCII, 600 to 9600 baud, TABS; DE9 connector Access-T 1500 RS232 ASCII, 600 to 9600 baud, or TABS; DB25 connector Chain Port RS485, to link up to 30 Access-Ts sharing a single TABS connection (9600 baud only);...
Page 62: Installation
ACST-0351-005 Chapter 3 June 1996 Installation Installation This chapter describes Access-T wiring connections and equipment mounting. Most system configuration is performed through the Craft, Supervisory, and/or Chain Ports as described in Chapters 6 and 8. However, Access-T also includes some user-configurable switches, which are defined later in this chapter.
Page 63 Chapter 3 ACST-0351-005 Installation June 1996 Access-T Models Access-T is available in several different hardware configurations: • Access-T 100: 1 DTE Port ac or dc power with or without Aux (drop-and-insert) port • Access-T 200: 2 DTE Ports ac or dc power with or without Aux (drop-and-insert) port •...
Page 64 ACST-0351-005 Chapter 3 June 1996 Installation PORT 4 SP11 PORT 3 PORT 2 CHAIN EXPANDER EXT CLOCK SUPV PORT LINE PORT PORT PORT 1 A. Series 400, AC Power PORT 2 CHAIN EXPANDER EXT CLOCK SUPV PORT LINE PORT PORT PORT 1 B.
Page 65 Chapter 3 ACST-0351-005 Installation June 1996 CRAFT PORT LINE 9-15 LINE 1-8 VT100 TV925 SEL ECT EXT CLOCK ALARM RELAY DTE PORTS SUPV PORT EXTERNAL DC POWER -48V -48V CRAFT PORT CHAIN PORT AUX 1-8 AUX 9-15 Figure 3-2. Access-T 1500 Chassis, Rear Panel...
Page 66: Receiving, Unpacking, And Inspection
Larscom Incorporated and the carrier immediately. Installation and Site Requirements Larscom recommends that the Access-T 100/200/400 units as well as the Access-T 1500 units be installed in a restricted access area, such as a telecommu- nications equipment room, and that the installation be performed by trained installation engineers.
Page 67 Chapter 3 ACST-0351-005 Installation June 1996 Mounting Brackets are provided for mounting Access-T in a standard 19-inch or 23-inch equipment rack. Access-T can also be wall-mounted or placed on a table top. To rack-mount Access-T: 1. Determine the desired location. Different Access-T models require different vertical clearance.
Page 68 ACST-0351-005 Chapter 3 June 1996 Installation Power Access-T can be equipped with an ac or dc power supply. To establish power, follow the procedure applicable to your unit. Precise power specifications are provided in Table 2-B. Access-T Series 100, 200, and 400 Units AC Power Access-T 100/200/400 units equipped with an ac source are powered from a standard 115, 230 V ac supply.
Page 69 To apply -48 volt dc power to the Access-T, perform the following steps: 1. Remove the three-slot black plug from connector TB1 on the Access-T rear panel. (Contact Larscom if this plug has been lost.) 2. Using #14 AWG (minimum) wire, connect the -48 volt dc power, return, and ground leads to the plug as illustrated in Figure 3-3.
Page 70 ACST-0351-005 Chapter 3 June 1996 Installation Access-T 1500 Units The Access-T 1500 supports redundant (loadsharing) dual power supplies. Any combination of 115 V ac and/or -48 V dc power supplies may be installed. If two power supplies are installed and connected to different 115 V ac and/or -48 Vdc sources, the unit will remain powered in the event of the failure of either power source.
Page 71 Chapter 3 ACST-0351-005 Installation June 1996 4. To remove an installed power supply and/or insert a new power supply into the chassis, follow these steps: a. Remove the screws and faceplate covering the power supplies. Then, grasp the extractor handle at the bottom of the faceplate and pull.
Page 72: Installer Wiring
RS449 interface and a V.35 interface, respectively. The ports are configured as DCE devices; thus, straight-through cables are required to connect to DTE devices. Larscom offers cables for connection to EIA 530, RS449, and V.35 interfaces. See Table 9-A for part numbers.
Page 73 Chapter 3 ACST-0351-005 Installation June 1996 Clear to Send Return Test Mode (to DTE) Transmit Clock Return External Clock (from DTE) External Clock Return Terminal Ready Return Data Carrier Detect Return Data Set Ready Return Receive Clock Return Data Carrier Detect (to DTE) Terminal Ready Signal Ground Request to Send Return...
Page 74 2. Install the appropriate cable between the connector and the T1 DTE connector on the DTE, making sure that each connector is oriented properly and mated securely. Refer to Table 9-A for a complete list of all Larscom cables and part numbers. 3-13...
Page 75 AUX PORT connectors. Larscom provides a separate RJ48C connector for each aux interface via an accessory kit, as described in Appendix E. Alternatively, Larscom pro- vides an accessory kit with two standard 50-pin female AMP CHAMP connec- tors which mate to the rear-panel connectors. Refer to Appendix E for pinout and connection information.
Page 76 ACST-0351-005 Chapter 3 June 1996 Installation Slot Number 1, Rcv Ring Slot Number 1, Rcv Tip Slot Number 2, Rcv Ring Slot Number 2, Rcv Tip Slot Number 3, Rcv Ring Slot Number 3, Rcv Tip Slot Number 4, Rcv Ring Slot Number 4, Rcv Tip Slot Number 5, Rcv Ring Slot Number 5, Rcv Tip...
Page 77 Chapter 3 ACST-0351-005 Installation June 1996 Slot Number 9, Rcv Tip Slot Number 9, Rcv Ring Slot Number 10, Rcv Ring Slot Number 10, Rcv Tip Slot Number 11, Rcv Ring Slot Number 11, Rcv Tip Slot Number 12, Rcv Ring Slot Number 12, Rcv Tip Slot Number 13, Rcv Ring Slot Number 13, Rcv Tip...
Page 78: Network Interface (Ni)
LINE Larscom offers cables using DA15 or RJ48 connectors, plus a DA15-to-RJ48 adapter. See Table 9-A for the part numbers of all Larscom cables and adapters. See Appendix A for the illustrations of all Larscom cable connections. NOTICE: Before connecting to a public T1 or FT1 serv- ice, read the Notice to Users (page xiv).
Page 79 LINE provides a separate RJ48C connector for each T1 line interface via an accessory kit, as described in Appendix E. Alternatively, Larscom provides an accessory kit with two standard 50-pin male AMP CHAMP connectors (A87-AK05-001) which mate to the rear-panel connectors. Refer to Appendix E for pinout and connection information.
Page 80 ACST-0351-005 Chapter 3 June 1996 Installation Plugs onto shield lug shield Another to pin 2 shield Access-T Another to pin 1 to pin 2 Access-T to pin 1 Figure 3-11. Chain Port Connections RS485 RS485 RS232 Chain Chain Chain SUPV Access-T Access-T Access-T...
Page 81 To interconnect Access-T units via the Chain Port, perform the following steps: 1. Remove the two-slot black Molex plug from the Chain Port connector on the Access-T rear panel. (Contact Larscom if this plug has been lost.) 2. Provide the required lengths of wire, preferably #22 or #24 AWG braided wire.
Page 82 RS485 chain connections from another Access-T configured as a master. Recommended Larscom cables and part numbers are listed in Table 9-A. To establish a supervisory connection to Access-T via the Supervisory Port, follow these steps: 1.
Page 83 Chapter 3 ACST-0351-005 Installation June 1996 Figure 3-13. Supervisory Port Pinouts (RS232), Access-T 100/200/400 Units Figure 3-14. Supervisory Port Pinouts (RS232), Access-T 1500 Unit 3-22...
Page 84 RS485 chain connections from another Access-T configured as a master. Recommended Larscom cables and part numbers are listed in Table 9-A. The Craft Port does not support modem hook-ups. To establish a temporary supervisory connection to Access-T via the Craft Port, follow these steps: 1.
Page 85 Chapter 3 ACST-0351-005 Installation June 1996 Figure 3-15. Craft Port Pinouts (RS232), Access-T 100/200/400 Units Figure 3-16. Craft Port Pinouts (RS232), Access-T 1500 Unit 3-24...
Page 86: Alarm Relay
ACST-0351-005 Chapter 3 June 1996 Installation Alarm Relay Access-T 1500 provides form C relays for each power supply to drive external alarm annunciation devices, such as bells or lights. The larm Relay is activated whenever a power supply loses power. The Alarm Relay is “dry”...
Page 87: Setting Dip Switches
Chapter 3 ACST-0351-005 Installation June 1996 DIP Switches Before operating Access-T, you must set the DIP switches for the hardware configu- ration, node address, and desired software operation mode. All possible configura- tion options are defined in Tables 3-A and 3-B and in the following sections. The DIP switches for the Access-T 100, 200, and 400 units are accessible through holes in the rear panel.
Page 88 ACST-0351-005 Chapter 3 June 1996 Installation Thumbscrew RP15 Figure 3-18 Access-T 1500 Module (Side View), DIP Switch Location Hardware Configuration/Operation Mode Before power-up, Access-T must be configured for the number of DTE ports and the operation mode via the DIP switches on the rear panel of the unit. The Access-T software can be configured to operate with a 1-port, 2-port, or 4-port unit in either master or slave mode.
Page 89: Node Address
Chapter 3 ACST-0351-005 Installation June 1996 Node Address Each Access-T must be given a unique node address. The node address is used to identify the nodes in the chain for polling, alarm reporting, and command forwarding. Node addresses are also used in the sending and receiving of TABS commands;...
Page 90 ACST-0351-005 Chapter 3 June 1996 Installation Table 3-B. DIP Switch Settings for Node Addresses (cont’d) Node Address Switch 1 Switch 2 Switch 3 Switch 4 Switch 5 Closed Closed Closed Open Closed Open Closed Closed Open Closed Closed Open Closed Open Closed Open...
Page 91: Modem Configuration
INTERFACE MODEM DATAKIT See Chapter 6 for instructions. Downloading Access-T Software Instructions for downloading new Access-T operation software can be found in Larscom publication: Access-T Software Downloading Instructions, ACST-6331-00x. 3-30...
Page 92: Front Panel Controls And Indicators
ACST-0351-005 Chapter 4 June 1996 Front-Panel Controls and Indicators Front-Panel Controls and Indicators The front panels of the Access-T Series 100, 200, and 400 and the Access-T Series 1500 are illustrated in Figure 4-1 and 4-2, respectively. Each unit includes the following status LEDs: •...
Page 93 Chapter 4 ACST-0351-005 Front-Panel Controls and Indicators June 1996 Figure 4-1. Access-T Series 100, 200, and 400 Front Panels...
Page 94 ACST-0351-005 Chapter 4 June 1996 Front-Panel Controls and Indicators Figure 4-2. Access-T 1500 Chassis with Modules Installed...
Page 95 Chapter 4 ACST-0351-005 Front-Panel Controls and Indicators June 1996 Table 4-A. Front-Panel Status Indicators GROUP INDICATOR COLOR CONDITION SYSTEM STATUS Self-test failure, or NIM or Main processor operating in boot mode Amber DCD active (modem connection and terminal session established) Green Normal operation NETWORK...
Page 96: Power-Up Self-Test
If Access-T does not pass the self-test, the LED will remain red. Call STATUS Larscom Customer Service. Power Supply Indicators The power supplies in Access-T 1500 are mounted behind the first panel at the right of the chassis. If one power supply fails, the other (if installed) will provide power for the entire unit.
Page 97: Automatic Baud Rate Detection
Chapter 4 ACST-0351-005 Front-Panel Controls and Indicators June 1996 Associated with the Craft Port connector are two LEDs ( ) and VT100 TV 925 one pushbutton ( ), which are used to select the type of terminal con- SELECT nected to the Craft Port and to initiate auto-bauding. Changes made using the pushbutton affect the Craft Port only;...
Page 98 ACST-0351-005 Chapter 4 June 1996 Front-Panel Controls and Indicators Using Multiple Command Ports Concurrently It is possible to use the Craft, Supervisory, and Chain Ports simultaneously. When using more than one port, take the following precautions: 1. Once the Supervisory Port has been configured via the Terminal Interface, do not change the configuration (terminal option, baud rate, stop bits, or parity).
Page 99: Terminal Display
ACST-0351-005 Chapter 5 June 1996 The Terminal Interface The Terminal Interface This chapter describes the general operation of the Terminal Interface: what appears in the display, how the menus are structured, how to move through the menus, and how to select options. Specific configuration procedures are de- scribed in Chapter 6;...
Page 100 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Node Information Alert Banner Title Bar User-Defined Name ALERT Larscom Access-T Network Access DSU/CSU m=XX n=XX SANJOSE < < << SYSTEM ALARMS LINE TEST REPORTS COMMANDS DS0 CONFIGURATION Main Menu Line MASTER CLOCK...
Page 101 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface Table 5-A. Terminal Interface Control Keys TERMINAL KEY FUNCTION ↓ Moves the cursor down one item in a drop-down menu. Moves the cursor up one item in a drop-down menu. → Moves the cursor one item to the right along the Main Menu Line. ←...
Page 102: Logging On And Off
Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Logging On and Off Access to the Terminal Interface via the Supervisory Port can be restricted with the password protection feature. When enabled, password protection prevents unauthorized users from logging on the Access-T system. Logon and logoff procedures are given at the end of Chapter 6.
Page 103 June 1996 The Terminal Interface Figure 5-2. Access-T Initial Terminal Display Larscom recommends that you use the key for the exit function unless the Access-T is being used in such a configuration. Instructions for changing from are provided in Chapter 6.
Page 104 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Figure 5-3. Access-T DTE Drop-Down Menu Moving Up and Down the Menu Paths To move up or down the menu path, press the up or down ( or ↓) arrow key. After an up or down arrow is pressed, the selection bar moves to reflect the new position and ↓...
Page 105 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface Figure 5-4. Typical Menu Path The Question Mark (?) Key Use the question mark ( ) key to redraw the screen and display the Access-T start-up menu. If Access-T is operating as a master, the key always takes you back to the master node’s initial display.
Page 106 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Table 5-B. Access-T Menus, Parameters, and Options MENU PATH OPTIONS / RESULTS SYSTEM → SNMP → MANAGEMENT NO, YES SYSTEM → SNMP → SETS DISABLED NO, YES SYSTEM → SNMP → IP ADDRESS 15 ASCII characters, 0 is the default SYSTEM →...
Page 107 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface Table 5-B. Access-T Menus, Parameters, and Options (cont’d) MENU PATH OPTIONS / RESULTS SYSTEM → SET MODEM DIALOUT → PRIMARY 36-character entry, [no entry] (ALTERNATE) → DIAL STRING SYSTEM → SET MODEM DIALOUT → PRIMARY Hour : Minute, 00:00 (ALTERNATE) →...
Page 108 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Table 5-B. Access-T Menus, Parameters, and Options (cont’d) MENU PATH OPTIONS / RESULTS ALARMS → SETUP → DTE → ALARM TYPE → ENABLE NO, YES ALARMS → SETUP → DTE → ALARM TYPE →...
Page 109 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface Table 5-B. Access-T Menus, Parameters, and Options (cont’d) MENU PATH OPTIONS / RESULTS DTE → AUX PORT → FRAMING D4, ESF DTE → AUX PORT → CODING AMI, B8ZS DTE → AUX PORT → EQUALIZATION 0-133, 133-266, 266-399, 399-533, 533- 655 OFF, ON...
Page 110 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Table 5-B. Access-T Menus, Parameters, and Options (cont’d) MENU PATH OPTIONS / RESULTS REPORTS → ONE-HOUR STATISTICS → TELCO Display showing the one-hour count REPORTS → ONE-HOUR STATISTICS → USER of the specified register type in 4 REPORTS →...
Page 111 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface Table 5-C. Glossary of Terms and Abbreviations in Menus TERM MEANING ACTIVE Configures a port’s RTS under PORT to be controlled by the DTE. ADDRESS Access-T address, used for TABS interface and node selection. AIS TO DTE Generates Alarm Indication Signal toward the Aux port when LOS or LOF occurs from the line (at least one DS0 must be dedicated to the Aux port).
Page 112 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Table 5-C. Glossary of Terms and Abbreviations in Menus (cont’d) TERM MEANING CHANGE PROTOCOL Engages Access-T’s Search Mode; Access-T waits to receive either a SLIP/PPP packet, TABS command, or Terminal escape sequence ($USERMODE$).
Page 113 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface Table 5-C. Glossary of Terms and Abbreviations in Menus (cont’d) TERM MEANING DATE The Access-T system date. DATE & TIME The Access-T system date and time. DESCRIPTION Under REPORTS, displays the description of the Access-T software and hardware.
Page 114 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Table 5-C. Glossary of Terms and Abbreviations in Menus (cont’d) TERM MEANING INACTIVITY TIMEOUT Under MODEM DIALOUT, amount of time (0 - 255 minutes) Access-T will keep a connection to an inactive line before hanging up (ending a sesion). This value applies to modem and SLIP/PPP sessions.
Page 115 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface Table 5-C. Glossary of Terms and Abbreviations in Menus (cont’d) TERM MEANING MAX CONFIGURE Maximum number of configure requests that can be sent from Access-T without receiving an acceptable ACK response. (PPP only) MAX FAILURE Maximum number of unacceptable configure requests that can be received before Access-T gives up.
Page 116 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Table 5-C. Glossary of Terms and Abbreviations in Menus (cont’d) TERM MEANING REMOTE-DOWN Clearing of a loopback at the remote Access-T, via FDL or in-band codes. REMOTE-UP Establishment of a loopback at the remote Access-T, via FDL or in-band codes. REMOTE-VERIFY Check of whether far-end Access-T is looped back to the line.
Page 117 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface Table 5-C. Glossary of Terms and Abbreviations in Menus (cont’d) TERM MEANING STOP BITS The number of stop bits per word transmitted via the Supervisory Port. STOP TIME Under SET MODEM DIALOUT, defines the stop time of the primary or alternate dial strings.
Page 118: Selecting Options
Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Table 5-C. Glossary of Terms and Abbreviations in Menus (cont’d) TERM MEANING XON-XOFF Whether XON-XOFF handshaking is used for communication via the supervisory port. YELLOW Transmission of Yellow Signal when Access-T loses sync on the T1 line signal. YELLOW Passing of Yellow Signal from D4-ESF via the auxiliary (T1 DTE) Port, only if TRANSCODING...
Page 119: Dialog Boxes
ACST-0351-005 Chapter 5 June 1996 The Terminal Interface In the display shown below, the parameter for Port 2 has been selected, RATE and the currently specified option is Nx56 To change the rate selection to , you must press the down or up arrow Nx64 followed by the key.
Page 120 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 Menu Path Example The term “menu path” refers to the course you take through the various drop-down menus available via the Terminal Interface. Navigation through the key, and the menu paths is performed primarily using the arrow keys, the Enter key.
Page 121 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface option by pressing the → key once. 2. Move the cursor to the ALARMS Notice that the markers identify the current Main Menu Line << >> selection. The display reads: 3. Use the ↓ key to move the selection bar to .
Page 122 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 4. Press the key. The display changes to show additional line Enter options: 5. Press the ↓ key until the selection bar highlights the option as LINE shown in the previous display. Press the key.
Page 123 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface 6. Press the key until the selection bar highlights the option as ↓ shown in the previous display. Press the key. The display lists Enter the possible values for this parameter. An asterisk appears next to the currently selected value, as follows: , press the ↓...
Page 124 Chapter 5 ACST-0351-005 The Terminal Interface June 1996 8. Press the key. The asterisk appears next to the , verifying the new Enter selection: 9. Press the key to return to the previous menu. 10. Press the ↓ key until the selection bar highlights the ES INTERVAL option.
Page 125 ACST-0351-005 Chapter 5 June 1996 The Terminal Interface 11. Press the key. A dialog box appears at the bottom of the display, Enter prompting the operator for input: 12. Key-in and press the key. The display responds with Enter ENTERED to verify that the new value was accepted: 13.
Page 126: Configuration Procedures
ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Configuration Procedures This chapter provides specific procedures for configuring the Access-T, including the DTE and network interfaces and the RS232 ports. Access-T retains configuration settings (except tests and certain loopbacks) in non-volatile memory. Thus, no configuration settings are lost if power is dis- connected.
Page 127 1. Connect the terminal to the Access-T Craft Port connector. For a direct connection, Larscom recommends using DE-9 interface cable 080-2383-0xx for an Access-T 100, 200, and 400 units and DB25 interface cable (080-2603-0xx) for an Access-T 1500.
Page 128 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Setting the Communication Parameters for the Supervisory Port With communications established via the Craft Port, communication options for the Supervisory Port can be configured to match the equipment (modem, terminal, NMS, or SNMP manager) that will be connected to it. CAUTION: Changing communication parameters (e.g., baud rate) can disrupt Supervisory Port communications.
Page 129 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 Note 2: An Access-T configured as a slave can only have its option set to INTERFACE TERMINAL 9. Configure the terminal for the same baud rate, data word format, and handshaking as Access-T. If the terminal is software-configured, save the configuration so that the correct communications parameters are the terminal’s start-up defaults.
Page 130 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Table 6-A. Rules for Configuring Access-Ts as Master and Slave SLAVE Access-T01/02 Access-T Series 100, Access-T 1500 DSU/CSU 200, & 400 DSU/CSU DSU/CSU System MASTER Access-T 01/02 DSU/CSU Access-T Series 100, 200, & 400 DSU/CSU Access-T 1500 DSU/CSU System An “X”...
Page 131 15-character Internet address for this Access-T. Key-in the IP address in dotted notation form (xxx.xxx.xxx.xxx). Press the key. Enter Note: Larscom recommends that you define all slaves to have the same network address as the master. 6. Select the option. A dialog box appears, prompting you...
Page 132 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures 14. Select the option. The max configure value defines the MAX CONFIGURE maximum number of unacceptable configure requests that Access-T can send without receiving an ACK. At the prompt, key-in a value between 1 and 20. Press the key.
Page 133: Setting The System Name
Chapter 6 ACST-0351-005 Configuration Procedures June 1996 21. Press the key. 22. Select the option. SET MODEM DIALOUT 23. Select the . When communicating via SLIP or PPP, INACTIVITYTIMEOUTVALUE the inactivity timer is reset each time a proper IP packet is received. When the inactivity timer expires, a logout or connect termination occurs.
Page 134: Setting The Date And Time
ACST-0351-005 Chapter 6 June 1996 Configuration Procedures To set the system name, perform the following steps: 1. Select from the Main Menu Line. SYSTEM 2. Select the option. NAME 3. Enter the name (or make no entry to retain the current name). Note: Use only alphanumeric characters (letters and numbers), punctuation marks, or spaces in the system name.
Page 135: Setting The Clock Source
“exit” function for the Terminal Interface from . Larscom recommends that you do not make this change except for communication in such a configuration. Note: All Access-Ts on the same chain must have the same EXIT key configuration.
Page 136: Network Interface Configuration
ACST-0351-005 Chapter 6 June 1996 Configuration Procedures To toggle the exit key from , and vice versa, follow these steps: 1. Select from the Main Menu Line. SYSTEM 2. Select EXIT KEY 3. Select , depending on which key you wish to activate. 4.
Page 137: Dte Port Configuration
Chapter 6 ACST-0351-005 Configuration Procedures June 1996 DTE Port Configuration To configure a DTE port, perform the following steps: 1. From the Main Menu Line, select 2. Select , or PORT1 PORT2 PORT3 PORT4 3. With the cursor on , specify whether the DTE rate is a multiple RATE of 56 or 64 kbps.
Page 138 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures DCE is used to clock data in both directions. If the cable is too long, propagation delays may cause data received by the DCE to be out of phase with the clock transmitted to the DTE. Thus, data may be corrupted.
Page 139: Press The Enter Key
Chapter 6 ACST-0351-005 Configuration Procedures June 1996 Sending the DTE Port Configuration to the Far End command ( ) lets you transmit all SEND SYSTEM–DS0 CONFIGURATION–SEND near-end DTE port configurations to the far-end Access-T. Note: The command should be used only between units SEND that have identical DTE port and aux port hardware (i.e., both ends of the link have two DTE ports and one aux port).
Page 140 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Auxiliary T1 Port Configuration To configure the auxiliary drop-and-insert port, perform the following steps: 1. From the Main Menu Line, select 2. Select AUX PORT 3. Move the selection bar to and press the key.
Page 141 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 Transcoding Yellow Signal Yellow Signal Yellow Signal Access-T Access-T T1 Line Figure 6-1. Yellow Signal Transcoding To enable Yellow Signal transcoding between the auxiliary port and the line, follow these steps: 1. From the Main Menu Line, select 2.
Page 142 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures AIS to LINE When at least one DS0 is assigned to the auxiliary port and you want Access-T to generate AIS toward the line, must be enabled. With AIS TO LINE AIS TO LINE enabled, a Loss of Sync (LOS) or Loss of Frame (LOF) event at the aux port causes Access-T to generate AIS (unframed ALL ONES) to the line and Idle code (All ONES) is returned to the aux port, as illustrated in Figure 6-3.
Page 143 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 DS0 Bundling Assigning DS0s from the DTE ports to specific DS0s in the network signal is called “bundling.” Access-T lets you define two bundling configurations, MAP1 and MAP2. Select either map to be active. The active map is displayed under SYSTEM—DS0 CONFIGURATION—CURRENT To define the DS0 bundling maps, perform the following steps: 1.
Page 144 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures 7. Verify that the appropriate bandwidths are shown on line 1 when all 24 DS0s are bundled as desired. (Besides misassignment of DS0s, a possible cause of incorrect bandwidth numbers is improper selection of DTE rates, which may be Nx56 or Nx64 kbps.) 8.
Page 145 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 Selecting the Current Map Access-T lets you activate either of the two DS0 maps, or enable automatic switching of the maps as described in the previous procedure. To select which DS0 map is currently active, follow these steps: 1.
Page 146: Alarm Configuration
ACST-0351-005 Chapter 6 June 1996 Configuration Procedures This procedure works only in ESF point-to-point applications. To send the active DS0 map and DTE port configuration to the far-end Access-T, follow these steps: 1. Select from the Main Menu Line. SYSTEM 2.
Page 147 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 Alarm Reporting Method As stated earlier, Access-T can be configured to dial-out alarms in three ways: • Alert Message: In Terminal Interface Mode, Access-T sends a one- line banner (identifying the Access-T) to an ASCII terminal. The ALERT operator must then request an alarm history to identify the particular alarm.
Page 148: Enabling Alarms
ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Enabling Alarms For each alarm type, there are two enabling options: • Alarm declaration ( ENABLE • Automatic dialout when the alarm occurs ( DIAL If alarm declaration is enabled for a specific alarm type, you can independently select whether Access-T will dial out to report the alarm.
Page 149 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 Setting the BPV and ES Thresholds Two alarm conditions, Bipolar Violations and Errored Seconds, feature user- settable thresholds. The BPV threshold is specified as a negative exponent of 10 and is monitored over 15-minute intervals. A BPV threshold of 6, for example, is exceeded when a fifteen-minute period has an average BPV rate exceeding 1 BPV per million bits (i.e., when the BPV rate exceeds 10 The Errored Seconds (ES) parameter consists of a user-specified error count...
Page 150 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Modem Dialout Configuration Access-T can dial out to report alarms automatically to an ASCII terminal, network management system (NMS), or SNMP-based manager. The type of parameter as described dialout depends on the setting of the REPORT METHOD under Alarm Reporting Method earlier in this chapter.
Page 151 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 either a connection is established or each active dialstring has been dialed 15 times. If no connection has been established following 15 attempts, Access-T will wait for 15 minutes and then begin the dialing cycle again. Three other dialport parameters are user-specified, as follows: •...
Page 152 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures 5. Enter the primary dialstring at the flashing cursor. Preface the tele- phone number with the Hayes code: ATDT. The dialstring may contain up to 36 characters. Erroneous entries can be corrected using key, spacebar, or the left and right arrow keys.
Page 153 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 13. Select INACTIVITY TIMEOUT 14. Enter the Inactivity Timeout value. (The Inactivity Timeout is the length of time, in minutes, that Access-T waits before hanging up an inactive line. Inactivity is defined as no characters received by the Access-T.) Acceptable timeout values range from 1 to 255 minutes;...
Page 154: Resetting System Defaults
ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Resetting System Defaults The Access-T Reset System Default command ( COMMANDS—RESET SYSTEM ) resets all the system configuration options. The default values are DEFAULTS listed in bold type in Table 5-B. Note 1: The command does not reset the RESET SYSTEM DEFAULTS Aux Port alarm history report or deactivate a CS DTE loopback...
Page 155 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 To invoke the protocol search mode from the Terminal Interface, perform the following steps: 1. Select from the Main Menu Line. COMMANDS 2. Select CHANGE PROTOCOL 3. Select . Access-T blanks the terminal screen, enters search mode, and waits for a Terminal/TABS Interface command or valid SLIP/PPP packet.
Page 156 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Start Modem DCD Search Enabled SLIP Password Password <PASSWORD> Terminal/TABS Prompt Enabled Protocol DCD Lost or Inactivity Timeout Expired Search Mode CHANGE TABS Command/ PROTOCOL $USERMODE$ Command TABS Command/ TABS Command/ $USERMODE$ $USERMODE$ SLIP Terminal/TABS DCD Lost or...
Page 157 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 b. a valid TABS command is processed or the user keys-in an escape sequence to return to the Terminal/TABS Interface; or c. modem connection is lost. 3. If Access-T processes a TABS command, Access-T activates the TABS/Terminal Interface.
Page 158 ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Enabling and Specifying Passwords Access-T provides password protection to limit access via the Supervisory Port. (Connections via the Craft Port and Chain Port cannot be password-protected.) Passwords can be defined, enabled, and disabled via the Terminal Interface. The password may consist of up to seven characters.
Page 159 Chapter 6 ACST-0351-005 Configuration Procedures June 1996 To enable or disable password protection, perform the following steps: 1. Select from the Main Menu Line. SYSTEM 2. Select the option. PASSWORD 3. Select the option. ENABLE 4. Select to enable password protection, or to disable password protection.
Page 160: Logging Off
ACST-0351-005 Chapter 6 June 1996 Configuration Procedures Access-T will allow only five logon attempts via the terminal or modem. After five consecutive failed logon attempts, the Access-T will hang up (if connected to a modem) and not allow any logon attempts for 5 minutes. Logging Off The Log Off command ( ) exits the Terminal Interface when...
Page 161 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Alarms, Reports, and Tests This chapter describes three features that are used to monitor and test the performance and status of the communication links. It consists of three sec- tions: • Alarms.
Page 162 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Principles of Access-T Alarm Reporting Access-T supports three types of alarm dialout reporting methods: • Terminal Interface Alert Messages. • UnsolicitedTABS Messages. • SNMP Traps. The following sections describe each of these reporting methods. Refer to Chapter 6 for instructions on enabling an alarm reporting method via the Terminal Interface.
Page 163 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests After receiving the banner, you should view the Alarm History to identify ALERT the new alarm(s). Then you should clear the Alarm History. Clearing the Alarm History prevents continued dialouts to report the alarm. Procedures for viewing and clearing Alarm History are presented later in this chapter.
Page 164: Viewing Alarms
Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Viewing Alarms This section describes how to view the alarm setup options from the terminal interface. Access-T alarms can be divided into the following types: Chassis alarms: • Loss of Master Clock (MSTR CLK LOSS). •...
Page 165: Clearing The Alarm History
ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Alarm History The Alarm History report ( ) displays the status and ALARMS—ALARM HISTORY occurrences of up to 23 Access-T alarms. Access-T can provide up to four separate alarm histories: DTE, LINE, AUX PORT, and CHASSIS. The following information is displayed for each of the alarm conditions.
Page 166 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 — USER LINE ALARM HISTORY date and time Type First Last Initial Current Count BPVS date-time date-time NORMAL ALARM YELLOW date-time date-time NORMAL NORMAL date-time date-time NORMAL ALARM date-time date-time NORMAL ALARM SIGNAL LOSS date-time date-time NORMAL...
Page 167 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Performance and Status Reports Access-T provides the following summaries of performance and status infor- mation: • Description. • Configuration. • Status. • Modem Dialout Parameters. • 24-Hour Registers. • One-Hour Statistics. •...
Page 168 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Figure 7-2. Access-T Description Display Access-T Configuration The Access-T Configuration report ( ) displays the REPORTS—CONFIGURATION Access-T’s current configuration. To display the Access-T Configuration, perform the following steps: 1. Select from the Main Menu Line. REPORTS 2.
Page 169 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests The display presents the following information: • Name: The user-defined system name. • Map: The DS0 bundling configuration for the currently active map, either MAP1 or MAP2. • Master Clk: The clocking source for Access-T, which can be one of eight sources.
Page 170 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Figure 7-3. Access-T Configuration Display (4-Port Unit with Aux T1 DTE) The following information applies to DTE Ports 1, 2, 3, and 4. • Rate: Whether the DTE baud rate is Nx56 or Nx64 kbps. •...
Page 171 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Access-T Status The Access-T Status report ( ) displays the status of the Access-T REPORTS—STATUS T1 and DTE interfaces, as illustrated in Figure 7-4. To display the Access-T Status report, perform the following steps: 1.
Page 172 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Figure 7-4. Access-T Status Display DS0 Configuration Report The DS0 Configuration report ( ), illustrated in SYSTEM—DS0 CONFIGURATION—VIEW Figure 7-5, displays the configuration for the user-defined mapping parameters, including: • The current mapping option (MAP 1, MAP 2, or TIME). •...
Page 173: Dialout Configuration
ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Figure 7-5. DS0 Configuration Display Access-T Modem Dialout Parameters The Access-T Modem Dialout Parameters report ( SYSTEM—SET MODEM DIA- ), illustrated in Figure 7-6, displays the following information: LOUT—VIEW • Primary and alternate dialstrings, with respective start and stop times.
Page 174 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Figure 7-6. Access-T Modem Dialout Parameters Display 24-Hour Registers The 24-Hour Registers report ( ) displays the contents REPORTS—24-HOUR REGISTERS of a selected 24-hour performance register. As described in Chapter 2, Access-T maintains three independent sets of 24-hour performance registers: •...
Page 175 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Access-T maintains and displays 24-hour registers for: • Errored Seconds (ES)—maximum value of 65,535. • Severely Errored Seconds (SES)—maximum value of 65,535. • Unavailable Seconds (UAS)—maximum value of 65,535. • Bursty Errored Seconds (BES)—maximum value of 65,535. •...
Page 176 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 — USER ERRORED SECONDS date and time CURRENT INTERVAL : 79 seconds VALID INTERVALS : 96 LOFC 24-HOUR TOTAL 1573 CURRENT COUNT LAST 96 INTERVALS Press EXIT Key to Continue. Figure 7-7. 24-Hour Register Display To display a 24-hour Register report, perform the following steps: 1.
Page 177 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests One-Hour Statistics The One-Hour Statistics command ( ) displays in REPORTS—ONE-HOUR STATISTICS a single report the 24-hour error count and a 1-hour error breakdown for six performance parameters: • Errored Seconds (ES)—maximum value of 65,535. •...
Page 178 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 — TELCO ONE-HOUR STATISTICS date and time CURRENT INTERVAL 251 seconds VALID INTERVALS LOFC 24-HOUR TOTAL : CURRENT COUNt : Interval 1 Interval 2 Interval 3 Interval 4 Press EXIT Key to Continue. Figure 7-8.
Page 179 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests 4. Select to confirm your request to clear the registers; select abandon this command. ESF Errors The ESF Errors report ( ) displays the count of ESF errors. In REPORTS—ESF ERRORS ESF framing mode, an ESF error is defined as either a CRC error or an Out-of-Frame event.
Page 180 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 To display an ESF Error Count, perform the following steps: 1. Select from the Main Menu Line. REPORTS 2. Select ESF ERROR COUNT 3. Select the desired register type ( , or USER TELCO FDL TELCO...
Page 181: Line Availability
ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Line Availability The Line Availability command ( ) displays the per- REPORTS—LINE AVAILABILITY centage of seconds which were not Unavailable Seconds. The percentage is based on the current interval and the valid intervals in the User 24-Hour Unavailable Seconds register.
Page 182 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Buffer Error Count The Access-T Buffer Error Count View command ( COMMANDS—BUFFER ERROR ) provides a tally of clock alignment errors at the Line, Port 1, Port COUNT—VIEW 2, Port 3, Port 4, and Aux Port interfaces. The primary use of the Buffer Error Count command is to troubleshoot the system and pinpoint where a problem is occurring.
Page 183: Snmp Parameters
ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests SNMP Parameters The SNMP Parameters report ( ), illustrated in Figure 7-12, SYSTEM—SNMP—VIEW displays the configuration for the user-defined SNMP parameters, including: • Management: Whether SNMP support is enabled or disabled. •...
Page 184 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Figure 7-12. SNMP Parameters Report • Interbyte Timeout: The number of seconds allowed between bytes when receiving a SLIP or PPP packet. • Circuit ID: User-defined text string which identifies the line. Used in trouble shooting.
Page 185 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests MIB-II Counts The MIB-II Counts report ( ) provides counts for several REPORTS–MIB-II COUNTS MIB-II variables in five different reports: • UDP Counts. • ICMP Counts. • IP Counts. • Interface Counts. •...
Page 186 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Master Mode Reports When Access-T is configured as a master, another set of reports becomes available to the operator. These reports include Node Alarm Status, Chain Port Poll History, and Chain Port View. For information on these master-mode reports, refer to Chapter 8.
Page 187 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Figure 7-14. Access-T Loopback Paths 7-27...
Page 188 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Special Loopback Configuration Conditions This section describes all the special configuration settings that must be enabled or disabled for certain loopbacks to operate properly. Other special loopback rules are also provided in this section. Remote CS Loopbacks 1.
Page 189: Activating Loopbacks
ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests , and commands require that at both ends. In T1E1P T1E1L FRAMING = ESF addition, to receive or transmit must be set to T1E1P T1E1L T1.403 3. Loopbacks established via FDL codes have priority over locally-established loopbacks (except LS DTE loopbacks, which prevent Access-T from receiving the network signal).
Page 190 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 6. Select the desired line loopback group: • selects the loopback group with options that will place LOCAL the near-end Access-T into a loopback. Go to step 7. • selects the loopback group which places the far- REMOTE-UP end Access-T into a loopback through an FDL command.
Page 191 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Remote Loop Verify Access-T provides a Remote Loop Verify command so the near end can easily determine if the far end is in loopback toward the line. The command causes Access-T to transmit QRSS for about five seconds and to monitor the received signal for QRSS;...
Page 192 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Automatic Verification of Remote Loopback Commands Access-T can be configured to execute a Remote Loop Verify test after any remote loopback command ( under REMOTE-UP REMOTE-DOWN TEST—LINE LOOP ). If this feature is enabled, a loop status message, indicating TEST—PORT LOOP the success or failure of a loopback command, will be indicated in the Header Line.
Page 193: Test Patterns
ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Test Patterns To test looped or unidirectional circuits, Access-T can transmit a framed QRSS test pattern toward the T1 line. QRSS (Quasi-Random Signal Source) is an industry-standard pattern of 2 -1 bits which simulates normal traffic. The QRSS test pattern can be inserted in the entire bandwidth (24 DS0s), in the DS0s assigned to a specified DTE channel, in the DS0s assigned to the Aux port, or in the DS0s carrying idle code (i.e., unassigned DS0s).
Page 194 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Bit Error Testing When the Access-T is transmitting a QRSS test pattern toward the network, it monitors the signal coming from the network for the QRSS pattern. If the QRSS pattern is looped back toward the Access-T (either locally, in the network, or at the far end), the Access-T will sync on the QRSS pattern and report any bit errors detected.
Page 195 ACST-0351-005 Chapter 7 June 1996 Alarms, Reports, and Tests Restarting the NIM The Restart NIM command ( ) causes the Network COMMANDS—RESTART NIM Interface Module to re-initialize without powering the Access-T down and up again. All performance registers are cleared (including telco registers). Any DS DTE, DS Line, LS DTE, or LS Line loopback will also be cleared.
Page 196 Chapter 7 ACST-0351-005 Alarms, Reports, and Tests June 1996 Restarting the Mux The Restart Mux command ( ) causes the Mux module COMMANDS—RESTART MUX to re-initialize without powering the Access-T down and up again. During re-initialization, Access-T updates its operating mode and examines all vali- dation bytes.
Page 197 ACST-0351-005 Chapter 8 June 1996 Using Access-T as a Master Using Access-T as a Master This chapter describes the operation and configuration commands and the polling capabilities that are exclusive to a master Access-T. Master commands include node configuration, node selection, and alarm history viewing and clearing. Master and Slave Modes As described in Chapter 2, each Access-T is user-configured to operate in one of two modes: master or slave.
Page 198 Chapter 8 ACST-0351-005 Using Access-T as a Master June 1996 Master Access-T Slave Access-T Polling of slaves is Node address is RS485 (TABS) enabled assigned Dialout for non- Individual alarms Polling Poll responding slaves are enabled Response is enabled Dialout is enabled Dialout parameters for individual are defined...
Page 199 ACST-0351-005 Chapter 8 June 1996 Using Access-T as a Master Node Addresses and Alert Indications in the Title Bar In master mode, the Title Bar displays two node addresses in the upper left corner, as shown in Figure 8-2. The first, , is the address of the master—i.e., m=XX the Access-T to which the terminal is attached.
Page 200 Chapter 8 ACST-0351-005 Using Access-T as a Master June 1996 Setting Node Addresses and Operating Modes When Access-Ts are chained via the RS485 Chain Ports, you must ensure that each node is configured for the proper mode and has a unique address. The mode and address must be set via DIP switches on the rear panel of the unit.
Page 201 ACST-0351-005 Chapter 8 June 1996 Using Access-T as a Master 5. Specify the slaves to be polled as follows: a. Select POLL b. Select to specify a slave to be polled (or to specify ENABLE DISABLE a slave which is no longer to be polled). c.
Page 202 Chapter 8 ACST-0351-005 Using Access-T as a Master June 1996 Selecting a Node Via the master Access-T, you can communicate with any Access-T in the chain by “selecting” its address. When you select a particular node, its address ” and its name appears at the far right, as shown appears in the Title Bar after “...
Page 203 ACST-0351-005 Chapter 8 June 1996 Using Access-T as a Master Copying a Node’s Configuration Via a master, you can copy the configuration of one node to another node over the Chain Port. When this command is requested, Access-T downloads the following configuration information: •...
Page 204 Chapter 8 ACST-0351-005 Using Access-T as a Master June 1996 Master Mode Reports Various reports which are supported only in master mode let you examine the configuration and status of the chained Access-Ts. Among other uses, these reports help you identify the node at which an alarm has occurred, so you can select that node and examine it for detailed alarm information.
Page 205 ACST-0351-005 Chapter 8 June 1996 Using Access-T as a Master Figure 8-3. Access-T Node Configuration Display Viewing Polling Status and History In master mode, Access-T lets you display a Chain Port Polling History, as shown in Figure 8-4. This report records changes in responding status (from responding to not responding, or vice versa) for all nodes in the chain.
Page 206 Chapter 8 ACST-0351-005 Using Access-T as a Master June 1996 To view the Chain Port Polling History, perform the following steps: 1. Make sure that the master Access-T is selected, and not one of the slaves. (You can do so by typing 2.
Page 207 ACST-0351-005 Chapter 8 June 1996 Using Access-T as a Master The Chain Port History is cleared when you execute the ALARMS—CLEAR command at the master Access-T (as described in HISTORY—FORCE (VIEWED) Chapter 7). Note 1: When an alert indication appears in the Title Bar, the operator should check the Chain Port Polling History first to verify that all nodes are still in communication before explor- ing other options.
Page 208 Chapter 8 ACST-0351-005 Using Access-T as a Master June 1996 - NODE ALARM STATUS - date and time ACCESS-T ALARMS DIAL ACCESS-T ALARMS DIAL Press EXIT Key to Continue. Figure 8-5. Access-T Node Alarm Status Display 8-12...
Page 209 ACST-0351-005 Chapter 8 June 1996 Using Access-T as a Master Summary of Alarm Identification in Master Mode You can learn of an alarm in an Access-T chain in several ways: • If you are directly connected to the master Access-T, you will see the ALERT indication appear in the Title Bar.
Page 210: Maintenance
Chapter 9 June 1996 Maintenance Maintenance The Access-T DSU/CSU is not field-repairable. It should be returned to Larscom Incorporated for any required repairs. Preventive maintenance is not required for the Access-T. Replacing the Fuse Access-T Series 100, 200, and 400 Units, AC Power Access-T 100, 200, and 400 units powered by an ac source come equipped with a spare fuse to be used in the event that the primary fuse blows.
Page 211 Access-T Series 100, 200, and 400 Units, DC Power Access-T 100, 200, and 400 units powered by a dc source do not have a spare fuse included within the unit. If the fuse blows, call Larscom and ask for part number 250-110-90 (2-port) or 250-110-50 (4-port).
Page 212: Replacement Parts
Verify that the power supply is securely mated to the rear of the chassis. Replacement Parts Field-replaceable parts are limited to the various cables and the fuse. When ordering spare or replacement parts, use the model/part numbers given in Table 9-A. Contact Larscom Customer Service Administrators for any other information required.
Page 213: Customer Service
When problems cannot be rectified over the telephone, on-site service is avail- able. For information about on-site service, as well as training classes at Larscom or the customer’s location, contact Larscom Customer Service. Table 9-A. Access-T Parts and Accessories...
Page 214 ACST-0351-005 Chapter 9 June 1996 Maintenance Table 9-A. Access-T Parts and Accessories (cont’d) NUMBER DESCRIPTION 080-2333-0xx DTE Cable, EIA530 to EIA530 (DB25P to DB25S), DCE-DTE, shielded * 080-2263-0xx DTE Cable, EIA530 to EIA V.35 (DB25P to M34P), DCE-DTE, shielded * DTE Cable, EIA530 to RS449 (DB25P to DC37P), DCE-DTE, shielded * 080-2273-0xx 080-2443-0xx...
Page 215: Factory Repair Service
Larscom provides factory repair service at reasonable rates. Equipment covered by the warranty is repaired at no charge. (See warranty for details.) Equipment not under warranty is subject to a nominal repair charge. Contact Larscom Customer Service for a return authorization number (RA#) to expedite handling and repair of returned equipment.
Page 216 FTP Server Customer Access You can now retrieve general product information and SNMP MIB files electroni- cally via the Larscom FTP server. Currently, you can find RFC 1406 (DS1/E1) and RFC 1407 (DS3/E3), and the Larscom private MIB under the pub/mibs directory.
Page 217: Cable Drawings
ACST-0351-005 Appendix A June 1996 Cable Drawings APPENDIX Cable Drawings This appendix provides pin-to-pin illustrations for all Larscom cables sup- ported by Access-T. DCE-DCE, Shielded (EIA530 to EIA530) DB25P (male) DB25P (male) Drain Wire Drain Wire Shield Wire Shield Wire...
Page 218 Appendix A ACST-0351-005 Cable Drawings June 1996 DCE-DCE, Shielded (EIA530 to EIA530) DB25P (male) DB25S (female) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-2. DTE Cable, #080-2403-0xx...
Page 219 ACST-0351-005 Appendix A June 1996 Cable Drawings DCE-DTE, Shielded (EIA530 to EIA530) DB25P (male) DB25S (female) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-3. DTE Cable, #080-2333-0xx...
Page 220 Appendix A ACST-0351-005 Cable Drawings June 1996 DCE-DTE, Shielded (EIA530 to EIA530) DB25P (male) DB25P (male) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-4. DTE Cable, #080-2433-0xx...
Page 221 ACST-0351-005 Appendix A June 1996 Cable Drawings DCE-DCE, Shielded (EIA530 to V.35) DB25P (male) M34S (female) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-5. DTE Cable, #080-2413-0xx...
Page 222 Appendix A ACST-0351-005 Cable Drawings June 1996 DCE-DCE, Shielded (EIA530 to V.35) DB25P (male) M34P (male) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-6. DTE Cable, #080-2353-0xx...
Page 223 ACST-0351-005 Appendix A June 1996 Cable Drawings DCE-DTE, Shielded (EIA530 to V.35) DB25P (male) M34P (male) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-7. DTE Cable, #080-2263-0xx...
Page 224 Appendix A ACST-0351-005 Cable Drawings June 1996 DCE-DTE, Shielded (EIA530 to V.35) DB25P (male) M34S (female) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-8. DTE Cable, #080-2443-0xx...
Page 225 ACST-0351-005 Appendix A June 1996 Cable Drawings DCE-DTE, Shielded (EIA530 to RS449) DB25P (male) DC37S (female) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-9. DTE Cable, #080-2453-0xx...
Page 226 Appendix A ACST-0351-005 Cable Drawings June 1996 DCE-DCE, Shielded (EIA530 to RS449) DB25P (male) DC37P (male) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-10. DTE Cable, #080-2363-0xx A-10...
Page 227 ACST-0351-005 Appendix A June 1996 Cable Drawings DCE-DCE, Shielded (EIA530 to RS449) DB25P (male) DC37S (female) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-11. DTE Cable, #080-2423-0xx A-11...
Page 228 Appendix A ACST-0351-005 Cable Drawings June 1996 DCE-DTE, Shielded (EIA530 to RS449) DB25P (male) DC37P (male) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-12. DTE Cable, #080-2273-0xx A-12...
Page 229 ACST-0351-005 Appendix A June 1996 Cable Drawings DTE-DTE Shielded Crossover DE9S (female) DB25S (female) Shield Wire Shield Wire Figure A-13. Supervisory Cable, #080-2463-0xx A-13...
Page 230 Appendix A ACST-0351-005 Cable Drawings June 1996 DTE-DCE Shielded DE9S (female) DB25P (male) Shield Wire Shield Wire Figure A-14. Supervisory Cable, #080-2313-0xx A-14...
Page 231 ACST-0351-005 Appendix A June 1996 Cable Drawings DTE-DTE Shielded Crossover DE9S (female) DB25P (male) Shield Wire Shield Wire Figure A-15. Supervisory Cable, #080-2383-0xx A-15...
Page 232 Appendix A ACST-0351-005 Cable Drawings June 1996 DE9S-DE9S Shielded Crossover DE9S (female) DE9S (female) Shield Wire Shield Wire Figure A-16. Supervisory Cable, #080-2393-0xx A-16...
Page 233 ACST-0351-005 Appendix A June 1996 Cable Drawings DA15S to DA15S, Shielded Crossover DA15S (female) DA15S (female) 3 Drain Wires 3 Drain Wires Figure A-17. Line Cable, #080-2293-0xx A-17...
Page 234 Appendix A ACST-0351-005 Cable Drawings June 1996 DA15S-DA15S, Shielded DA15S (female) DA15S (female) 3 Drain Wires 3 Drain Wires Figure A-18. Line Cable, #080-2283-0xx A-18...
Page 235 ACST-0351-005 Appendix A June 1996 Cable Drawings DA15P-DA15S, Shielded DA15P (male) DA15S (female) Figure A-19. Line/Aux Cable #080-2503-0xx A-19...
Page 236 Appendix A ACST-0351-005 Cable Drawings June 1996 DA15S-RJ-48, Keyed, Shielded DA15S (female) Keyed RJ-48 (Drain Wire) Shield Figure A-20. Line Cable #080-2523-0xx A-20...
Page 237 ACST-0351-005 Appendix A June 1996 Cable Drawings DA15P-RJ-48, Keyed, Shielded Crossover DA15P (male) Keyed RJ-48 (Drain Wire) Shield Figure A-21. Line Cable #080-2553-0xx A-21...
Page 238 Appendix A ACST-0351-005 Cable Drawings June 1996 DA15S-RJ-48, Unkeyed, Shielded DA15S (female) Unkeyed RJ-48 (Drain Wire) Shield Figure A-22. Line Cable #080-2563-0xx A-22...
Page 239 ACST-0351-005 Appendix A June 1996 Cable Drawings 50-Pin RJ-48H to RJ-48C ACCESS-T 1500 MODULE Figure A-23. Line Cable #087-2143-001 A-23...
Page 240 Appendix A ACST-0351-005 Cable Drawings June 1996 50-Pin RJ-48H to RJ-48C ACCESS-T 1500 MODULE Figure A-24. Aux Cable #087-2143-002 A-24...
Page 241 ACST-0351-005 Appendix A June 1996 Cable Drawings DB25P-DB25P, DTE-DTE, Shielded Crossover DB25P (male) DB25P (male) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-25. Supervisory Cable #080-2603-0xx A-25...
Page 242 Appendix A ACST-0351-005 Cable Drawings June 1996 DB25P-DB25S, DTE-DTE, Shielded Crossover DB25P (male) DB25S (female) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-26. Supervisory Cable #080-2613-0xx A-26...
Page 243 ACST-0351-005 Appendix A June 1996 Cable Drawings DB25P-DB25S, DTE-DCE, Shielded DB25P (male) DB25S (female) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-27. Supervisory Cable #080-2623-0xx A-27...
Page 244 Appendix A ACST-0351-005 Cable Drawings June 1996 DB25P-DB25P, DTE-DCE, Shielded DB25P (male) DB25P (male) Drain Wire Drain Wire Shield Wire Shield Wire Figure A-28. Supervisory Cable #080-2633-0xx A-28...
Page 245 ACST-0351-005 Appendix B June 1996 Glossary APPENDIX Glossary Address The node number (or TABS address) assigned to a particular Access-T. Alarm vs. Alert In the most precise usage, an alarm is an off-normal condition indi- cating a performance or equipment degradation or failure. An alert is an indication of a change from a normal to an alarm condition or vice versa.
Page 246 Appendix B ACST-0351-005 Glossary June 1996 Baud Rate The number of possible signal changes per second; sometimes equivalent to the bit-per-second rate, but not always. Bipolar 8-Zero Substitution (B8ZS) B8ZS is a data-encoding scheme which replaces any eight consecutive ZEROS with a fixed code containing two bipolar violations. Equip- ment at each end of the T1 link must perform B8ZS encoding/decod- ing, and network equipment must not correct BPVs.
Page 247 ACST-0351-005 Appendix B June 1996 Glossary Clear Channel Capability Clear channel capacity means that the 192 “information” bits in a frame are all used for data; no bits are dedicated to pulse density assurance or signaling. Clear channel capability for T1 makes 1.536 Mbps available for user data.
Page 248 Appendix B ACST-0351-005 Glossary June 1996 Errored Second (ES) Bursty Errored Severely Errored Second (BES) Second (SES) 1 or more CRC-6 Errors 2 to 319 CRC-6 Errors 320 or more CRC-6 Errors; or 1 or more OOF and no OOF or SES or 1 or more OOF 10 consecutive 10 consecutive...
Page 249 ACST-0351-005 Appendix B June 1996 Glossary Digital Access Cross-Connect Switch (DACS) A digital switching device for routing DS0s among multiple T1 ports. Digital Terminating (or Terminal) Equipment (DTE) DTEs provide the source of the transmitted digital signal and the destination for the received digital signal. DTEs includes multiplex- ers, PBXs, T1 channel banks, front-end processors, computers, termi- nals, and LAN routers.
Page 250 Appendix B ACST-0351-005 Glossary June 1996 Facility Data Link (FDL) The ESF Facility Data Link is a 4 kbps channel carrying maintenance requests and responses, plus other maintenance messages. FDL Register The term FDL register refers to telco register contents obtained from a far-end Access-T (or other interface device) via the FDL.
Page 251: Multipoint Connections
ACST-0351-005 Appendix B June 1996 Glossary Loss of Signal (LOS) An error that occurs when a device is not receiving a T1 signal. Specifically, Access-T declares Loss of Signal when it receives 175 ± 75 consecutive ZEROS. LOS ends when Access-T receives at least one ONE.
Page 252 Appendix B ACST-0351-005 Glossary June 1996 Point-to-Point Connections In a point-to-point connection, a single T1 or FT1 link connects equipment at two locations. In such a connection, the signal is not reframed and the data link is not lost. Polling The task performed by a master Access-T when it requests data from each of its enabled slave nodes.
Page 253 ACST-0351-005 Appendix B June 1996 Glossary Supervisory Port An RS232 communications port located on the Access-T rear panel. The Supervisory Port is intended for use with a far-end device and is the only Access-T port equipped for modem connection. T1 refers to a digital bipolar link with a data capacity of 1.544 Mbps, also known as Digital Signal Level 1 (DS1).
Page 254 Appendix B ACST-0351-005 Glossary June 1996 User Register The user registers record performance of the input from the T1 line. User registers are analogous to telco registers, but cannot be accessed or cleared from the network. Thus, user registers allow the user to monitor and document network performance independent of the telco.
Page 255 CP01 Chain Port Expander Access-T allows supervisory control of “daisy-chained” units via RS485 ports. With the Larscom CP01 Chain Port Expander, RS485 facilities connecting mul- tiple Access-Ts can be linked to the supervisory master via RS232 ports. This appendix includes the following sections: •...
Page 256: Indicators And Switches
Appendix C ACST-0351-005 CP01 Chain Port Expander June 1996 Indicators and Switches Figure C-3 shows the front panel of the CP01, which includes five indicators and two switches. The switches allow each of the RS232-C ports (PRIMARY and SECONDARY) to be separately selected for DCE or DTE configuration. The front-panel indicators function as follows: •...
Page 257 ACST-0351-005 Appendix C June 1996 CP01 Chain Port Expander Network Management System Up to 30 chained units RS485 RS-232 CP01 Access-T Access-T RS485 RS-232 CP01 Access-T Access-T Figure C-2. CP01 Application with Multiple RS485 Chains TNDS-CP01 Chain Port Expander POWER RS485 COLL Figure C-3.
Page 258: Wiring Connections
Appendix C ACST-0351-005 CP01 Chain Port Expander June 1996 Mounting The CP01 is equipped with adhesive-backed hook-and-loop fastener strips for mounting to any smooth, flat surface. To mount the CP01: 1. Determine the desired location for the hook-and-loop fastener strips before peeling off the protective backing.
Page 259: Specifications
ACST-0351-005 Appendix C June 1996 CP01 Chain Port Expander If a second RS232-C connection is required, make the connection to the female DB25 SECONDARY connector. Only pins 2 and 3 of the connector are used for signal tranmission. Set the SEC switch on the front panel for DCE configuration or DTE configuration as required.
Page 260 ACST-0351-005 Appendix D June 1996 Access-T Operator Messages APPENDIX Access-T Operator Messages This chapter provides a detailed listing and explanation of all the operator messages that can be genereated by Access-T. AVAILABILITY NOT CALCULABLE — EXCESSIVE ERRORS. Notification that the number of UAS errors has exceeded 65,535.
Page 261 Appendix D ACST-0351-005 Access-T Operator Messages June 1996 INVALID HOUR ENTERED. An invalid entry was made while setting the system time. INVALID INTERVAL ENTERED. An invalid entry was made while defining the system line threshold ES Interval value. INVALID MONTH ENTERED. An invalid entry was made while setting the system date. INVALID MINUTE ENTERED.
Page 262 ACST-0351-005 Appendix D June 1996 Access-T Operator Messages UNSOL AND PASSWORD SETTINGS IN CONFLICT. Unsol and passwords cannot be enabled at the same time. . Access-T is attempting to establish the requested WAITING FOR VERIFICATION loopback.fo...
Page 263 June 1996 Access-T 1500 Accessory Kits APPENDIX Access-T 1500 Accessory Kits Larscom provides six different accessory kits for use with the Access-T 1500. These accessory kits are: • 19-inch Patch Panel (A87-AK03-001): Panel/cable combination used to convert the two male 50-pin line connectors on the rear panel of the Access-T 1500 to 15 RJ-48C connectors.
Page 264 (19-inch rack and 23-inch rack models) and two for the aux interface (19-inch rack and 23-inch rack models). Larscom uses a standard cross-connect patch panel, which comes equipped with 8 wires per channel; however, the Access-T 1500 connectors require only 4 of these wires.
Page 265: Installation
ACST-0351-005 Appendix E June 1996 Access-T 1500 Accessory Kits 087-2143-00x MULTI-LINE MULTI-LINE Figure E-2. Patch Converter Panel Cable, 087-2143-00x Installation To install the Patch Converter Panel and converter cable, follow these steps: 1. Determine the desired location. The patch panel should be positioned close enough to Access-T 1500 to allow the converter cable to reach.
Page 266 Appendix E ACST-0351-005 Access-T 1500 Accessory Kits June 1996 4. Using a Phillips screwdriver, secure a retaining clip to one side of the P1 and P2 connectors. (Retaining clips can be found in the plastic bag that came attached to the Access-T 1500 chassis.) 5.
Page 267 LINE the rear panel of Access-T 1500. With these crimp connectors, you can make all wiring connections necessary to support your specific application. Larscom recommends that you use 14 AWG wire for your connections. To make wiring connections, follow these steps: 1.
Page 268 • No component of an object ID can have a value larger than 127 except for the Larscom enterprise number (555). • Row insertion in tables is not supported. MIB-II variables are divided into the following 10 functional groups: •...
Page 269: System Group
Depending on the Access-T hardware configuration, this field returns the following: “Larscom Access-T 1 Port, <MUX S/W part number>.” “Larscom Access-T 1 Port, aux, <MUX S/W part number>.” “Larscom Access-T 2 Port, <MUX S/W part number>.” “Larscom Access-T 2 Port, aux, <MUX S/W part number>.”...
Page 270 ACST-0351-005 Appendix F June 1996 Standard MIB-II Definitions sysUpTime This read-only object returns the time elapsed since Access-T was restarted. Note: System up time is based on the timestamp when the unit was powered-up. Since Access-T allows for its date and time to be user-defined, the system up time may not be accurate if the date and time values are changed after power-up.
Page 271: Interfaces Group
Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 Interfaces Group The interfaces group contains generic information about Access-T’s physical interfaces, including configuration information and statistics on the events occurring at each interface. The interface group contains the following elements: ifNumber ifTable ifIndex ifDescr...
Page 272 DTE Port 2 DTE Port 3 DTE Port 4 Note: Index value “1" is allocated for a non-existent ethernet interface to make implementation consistent with the Larscom Proxy Agent and future products that may provide such an interface. ifDescr This read-only object provides a text description of the interface, as follows:...
Page 273 Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 ifType This read-only object describes what type of interface is available: ifIndex value MIB Value other (1) ppp (23) or slip (28) ds1 (18) ds1 (18) other (1) other (1) other (1) other (1) IfMtu This read-only object provides the size of the largest datagram which can be...
Page 274 ACST-0351-005 Appendix F June 1996 Standard MIB-II Definitions ifAdminStatus This read-write object controls or describes the interface state of a particular interface. It is equivalent to Access-T’s “Current Map”, and allows DS1s to be dropped/restored to the logical channel. Writes (SETs) specifying invalid val- ues will result in a “badValue”...
Page 275: Address Translation Group
Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 Address Translation Group This group contains one table which contains the network to physical address equivalences. For Access-T, this table is empty. IP Group The IP group contains information relevant to the implementation and opera- tion of the IP layer.
Page 276: Ip Forwarding
ACST-0351-005 Appendix F June 1996 Standard MIB-II Definitions ipForwarding This read-write object indicates whether the unit forwards datagrams (via a gateway) or not. Since Access-T does not act as a gateway, this value is always not-forwarding (2). Attempts to change this value will result in a “badValue” response.
Page 277 Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 ipInUnknownProtos This read-only object provides the number of locally-addressed datagrams received successfully but discarded because of an unknown or unsupported protocol. ipInDelivers This read-only object provides the total number of input datagrams successfully delivered to ICMP and UDP layers.
Page 278 ACST-0351-005 Appendix F June 1996 Standard MIB-II Definitions ipAdEntBcastAddr This read-only value is the least-significant bit in the IP broadcast address. For Access-T, this value is always 1. ipAdEntReasMaxSize This read-only object is the same as ifMtu for PPP/SLIP, which is 1500 for a PPP interface, 1006 for a SLIP interface, and 0 for all other interfaces.
Page 279: Icmp Group
Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 ICMP Group The ICMP group contains information relevant to the implementation and operation of ICMP. Objects that are not relevant or, for simplicity have not been implemented in Access-T, have null values (i.e., 0), indicated by not supported. Access-T will only respond to echo request messages.
Page 280 ACST-0351-005 Appendix F June 1996 Standard MIB-II Definitions icmpInMsgs This read-only object provides the total number of ICMP messages that Access-T received. icmpInErrors This read-only object provides the number of ICMP messages that Access-T received but determined as having ICMP-specific errors (i.e., bad ICMP check- sums, bad length and so on).
Page 281 Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 icmpInEchos This read-only object provides the number of ICMP Echo (request) messages received by Access-T. icmpInTimestamps This read-only object provides the number of ICMP Timestamp messages received by Access-T. icmpInAddrMasks This read-only object provides the number of ICMP Address Mask Reqeust messages received by Access-T.
Page 282: Tcp Group
ACST-0351-005 Appendix F June 1996 Standard MIB-II Definitions icmpOutEchoReps This read-only object provides the total number of ICMP Echo Reply messages that Access-T attempted to send. TCP Group The TCP group is not supported for Access-T. UDP Group The UDP group contains information relevant to the implementation and operation of the UDP.
Page 283: Egp Group
Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 udpNoPorts This read-only object provides the total number of received UDP datagrams for which there was no application at the destination port. udpInErrors This read-only object provides the total number of received UDP datagrams that could not be delivered for reasons other than the lack of an application at the destination port.
Page 284: Transmission Group
ACST-0351-005 Appendix F June 1996 Standard MIB-II Definitions Transmission Group The transmission group is based on the transmission media underlying each interface on a system. For Access-T, only the DS1 MIB (RFC 1406) is attached to this group. SNMP Group The SNMP group, which is fully supported by Access-T, is a table that contains information and statistics about the SNMP Agent.
Page 285 Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 snmpInpkts This read-only object provides the total number of PDUs delivered to Access-T from the transport service. snmpOutPkts This read-only object provides the total number of SNMP PDUs which were passed from Access-T to the transport service. snmpInBadVersions This read-only object provides the total number of syntactically correct SNMP PDUs which were delivered to Access-T and were from an unsupported SNMP...
Page 286 ACST-0351-005 Appendix F June 1996 Standard MIB-II Definitions snmpInGetNexts This read-only object provides the total number of SNMP GetNext PDUs which have been accepted and processed by Access-T. snmpInGetRequests This read-only object provides the total number of SNMP GetRequests which have been accepted and processed by Access-T.
Page 287 Appendix F ACST-0351-005 Standard MIB-II Definitions June 1996 snmpOutGenErrs This read-only object provides the total number of valid SNMP PDUs which were generated by Access-T and for which the ErrorStatus component is genErr. snmpOutGetResponses This read-only object provides the total number of SNMP GetResponse PDUs which have been generated by Access-T.
Page 288 ACST-0351-005 Appendix G June 1996 Access-T DS1 MIB Support APPENDIX Access-T DS1 MIB Support This appendix describes Access-T support for the application-specific DS1 MIB. For a complete description of the DS1 MIB refer to RFC 1406. The DS1 MIB is attached to the Standard MIB Transmission Group, which is described in Appendix F.
Page 289 Appendix G ACST-0351-005 Access-T DS1 MIB Support June 1996 dsx1ConfigTable This read-only object contains various configuration-related settings for Access-T’s DS1 interface. Since Access-T only has one line interface, the table contains only one instance. dsx1LineIndex This read-only object identifies the DS1-x line interface. It is equal to “ifIndex” (3).
Page 290 ACST-0351-005 Appendix G June 1996 Access-T DS1 MIB Support dsx1LineCoding This read-write object selects or indicates the DS1 line coding. Changing this object changes the coding for the Access-T DS1 line interface. MlB Values Description dsx1B8ZS (2) B8ZS dsx1AMI (5) AM I other (6) AMI, Bit 8 Stuffed...
Page 291 Appendix G ACST-0351-005 Access-T DS1 MIB Support June 1996 dsx1LineStatus This read-only object provides the status of the local Access-T DS1 line interface: MIB Values Description dsx1NoAlarm (1 ) No alarm present dsx1RcvFarEndLOF (2) Local Access-T receiving Yellow Alarm dsx1RcvAlS (8) Local Access-T receiving AIS dsx1LossOfFrame (32) Local Access-T Loss of Frame condition...
Page 292 ACST-0351-005 Appendix G June 1996 Access-T DS1 MIB Support dsx1Fdl This read-write object selects or indicates the mode of the facility data link (FDL). MIB Values Description dsx1Ansi-T1-403 (2) ANSI T1.403 ESF framing with T1.403 enabled dsx1Att-54016 (4) AT&T 54016 ESF framing with T1.403 disabled dsx1Att-54016 (6) AT&T 54016 ESF framing with T1.403 enabled dsx1 Fdl-none (8)
Page 293 Appendix G ACST-0351-005 Access-T DS1 MIB Support June 1996 dsx1CurrentTable Statistics The dsx1CurrentTable provides the following statistics: dsx1CurrentESs read-only dsx1CurrentSESs read-only dsx1CurrentSEFSs Not applicable dsx1Current UASs read-only dsx1CurrentCSSs read-only dsx1CurrentPCVs read-only dsx1CurrentLESs Not applicable dsx1CurrentBESs read-only dsx1CurrentDMs Not applicable dsx1CurrentLCVs read-only Note: dsx1...PCVs = Access-T’s ESFs and dsx1...LCVs = Access- T’s BPVs.
Page 294 ACST-0351-005 Appendix G June 1996 Access-T DS1 MIB Support dsx1IntervalTable Statistics The dsx1 IntervalTable provides the following statistics: dsx1IntervalESs read-only dsx1IntervalSESs read-only dsx1IntervalSEFSs Not applicable dsx1IntervalUASs read-only dsx1IntervalCSSs read-only dsx1IntervalPCVs read-only dsx1IntervalLESs Not applicable dsx1IntervalBESs read-only dsx1IntervalDMs Not applicable dsx1CurrentLCVs read-only dsx1TotalTable This read-only object contains the cumulative sum of the various statistics for...
Page 295 Appendix G ACST-0351-005 Access-T DS1 MIB Support June 1996 dsx1FarEndCurrentTable This read-only object contains various performance statistics being collected for the far-end Access-T’s current 15-minute interval. dsx1FarEndCurrentlndex This read-only object identifies the DS1-x line interface. It is equal to “ifIndex”, which is equal to “dsx1LineIndex”.
Page 296 ACST-0351-005 Appendix G June 1996 Access-T DS1 MIB Support dsx1FarEndlntervalTable This read-only object contains various performance statistics being collected for the far-end Access-T’s previous 24-hour interval for the DS1 line interface. The past 24 hours are divided into 96 15-minute intervals. dsx1FarEndlntervallndex This read-only object identifies the DS1-x line interface.
Page 297 Appendix G ACST-0351-005 Access-T DS1 MIB Support June 1996 dsx1FarEndTotalTable This read-only object contains the cumulative sum of the various statistics for the far-end Access-T’s 24-hour period preceding the current interval. his table has four instances, one for each DS1 line interface. dsx1FarEndTotallndex This read-only object identifies the DS1-x line interface.
Page 298 ACST-0351-005 Appendix G June 1996 Access-T DS1 MIB Support dsx1FracIndex The dsx1FracIndex value represents the DTE interface mapped for this particu- lar DS0 channel. Possible values are: MIB Values Description DS0 channel is unmapped or idlef DS0 channel is mapped to the Aux DS0 channel is mapped to DTE Port 1 DS0 channel is mapped to DTE Port 2 DS0 channel is mapped to DTE Port 3...
Page 299: Snmp Trap Support
ACST-0351-005 Appendix H June 1996 SNMP Trap Support APPENDIX SNMP Trap Support Access-T supports both SNMP generic and enterprise-specific traps. Traps are “autonomous” (i.e., unsolicited) messages used to report specific conditions or events that occur at an SNMP agent, such as Access-T. A special code and textual description identify each alarm and status.
Page 300: Trap Messages
Appendix F in the section IP Group. • generic-trap supports the predefined trap types listed in Table H-1. • specific-trap supports the Larscom Access-T alarms listed in the section Enterprise-Specific Traps. • time-stamp provides the elapsed time between the last reinitializa- tion of Access-T and the generation of the trap.
Page 301 ACST-0351-005 Appendix H June 1996 SNMP Trap Support Table H-2. Enterprise-Specific Traps Alarm Codes Alarm Code Description 20430 Loss-of-Signal (LOS) cleared. 20431 Loss-of-Signal (LOS) detected. 20460 Loss of sync cleared. 20461 Loss of sync detected. 20470 BPV violations no longer exceeds specified rate. 20471 BPV violations exceeded specified rate.
Page 302: Alarm Code
Appendix H ACST-0351-005 SNMP Trap Support June 1996 Table H-2. Enterprise-Specific Traps Alarm Codes (cont’d) Alarm Code Description 22140 Loss of sync no longer detected on aux port. 22141 Loss of sync detected on aux port. 22150 Errored Seconds threshold no longer exceeds specified rate on aux port 22151 Errored Seconds threshold exceeds specified rate on aux port...
Page 303: Point-To-Point Protocol
ACST-0351-005 Appendix I June 1996 Point-to-Point Protocol APPENDIX Point-to-Point Protocol This appendix provides supplementary information concerning the implemen- tation of PPP as it pertains to Access-T. PPP Support PPP support for Access-T is contrained to the following: • Maximum length of data field is 1500 bytes. •...
Page 304 Appendix I ACST-0351-005 Point-to-Point Protocol June 1996 mum packet size of 50 bytes. Access-T’s maximum size is limited to 1500. • Async-Control-Character-Map: Bit map of control charac- ters (characters whose ASCII values are less than 0x20) which should be discarded if found in the data stream. If character is not to be discarded, then the sender must either perform byte stuffing (replace character with a 2-byte escape se- quence) or negotiate a compatible map.
Page 305 Access-T 1500 modules Cable drawings Removing and inserting Cables 9-4, 9-5, A-1 Accessories 9-4, 9-5, E-1 Chain port 2-8, 2-10, 3-18, 3-17, Address, Larscom 8-9, 8-10, C-1 Affidavit, T1 connection xvii, xviii Expander 2-13, 6-16, 6-17 Managing nodes AIS to DTE 6-16...
Page 306 3-11, 6-12 Wiring connections 3-11 Configuration 6-12 to 6-14 Interface protocols 6-29 to 6-32 Internal communication failure 2-19 Internet number, Larscom IP address EIA 530 3-11, 3-12, 6-12, 6-15 Equalization 6-15 Equipment architecture 2-1, 2-2 Errored seconds (ES) 1-12, 2-16, 2-18,...
Page 307 Performance monitoring 2-16, 8-13 Manual overview 1-2, 1-3 Performance reports 7-7, 7-14 to 7-22, Maps 7-24, 8-9, 8-10 See DS0 maps Phone number, Larscom Master clock 6-12 Pinouts Master mode 2-4, 3-27, 3-28, Polling 8-4, 8-10 6-4, 6-5, 8-1, Status...
Page 308 Access-T Series 100, 200, 400, & 1500 ACST-0351-005 Index June 1996 IP addessing 1-23 IP address IP addressing 1-22 Self test Subnet addressing 1-23 Send DTE configuration 6-14 Subnet mask 1-23, 1-24 Service ordering information 2-26 Table-driven IP routing 1-25, 1-26 Severely errored second (SES) 1-12, 2-16, 7-15, 7-17 Temrinal interface...
Page 309 ACST-0351-A51 Larscom Incorporated October 1996 Addendum 1, ACST-0351-005 Addendum 1 Access-T Series 100, 200, 400 & 1500 Please make notes on the appropriate manual pages referenced by this adden- dum and insert this addendum inside the front cover of the Access-T Multi- Port DSU/CSU System Series 100, 200, 400, &...
Page 310 Larscom Incorporated ACST-0351-A51 Addendum 1, ACST-0351-005 October 1996 Page 3-10 Replace the last paragraph on the page with the following: Access-T 1500 employs loadsharing power supplies. Thus, when two supplies are installed and both are powered, they share the load and both the front- panel LEDs illuminate green.
Page 311 August 1996: ACST-0351-S51, Supplement 1, released. October 1996: ACST-0351-S52 obsoletes and replaces Supplement 1. December 1996: ACST-0351-S53 obsoletes and replaces Supplement 2. Larscom now offers two new Access-T models: • Access-T 100-S: Functionally identical to the single-port Access-T 100, but housed in a half-size chassis.
Page 312 Larscom Incorporated ACST-0351-S53 Supplement 3, ACST-0351-005 December 1996 • Compatibility with Other Versions of Access-T. Provides impor- tant information relevant to using the Access-T 100-S and/or Access-T RDL with other versions of the Access-T family of products. • Disabling Span Power. Provides a procedure on how to disable span power for Access-T 100-S and Access-T RDL.
Page 313: Phillips Screwdriver
Phillips screwdriver. If you did not receive the single- or the dual-rack-mount accessory kit, please call Larscom to obtain these parts. To rack-mount a single Access-T 100-S or Access-T RDL: 1. Attach the mounting ears (found in the Accessory Kit) to the sides of the unit using a Phillips screwdriver and the screws and washers provided.
Page 314 Larscom Incorporated ACST-0351-S53 Supplement 3, ACST-0351-005 December 1996 Specifications Table A provides the electrical and environmental specifications for the Access-T 100-S and Access-T RDL units. Figures 1 and 2 illustrate the Access-T 100-S and Access-T RDL front and rear panels, respectively.
Page 315 ACST-0351-S53 Larscom Incorporated December 1996 Supplement 3, ACST-0351-005 Compatibility with Other Versions of Access-T The Access-T 100-S and Access-T RDL are compatible with other versions of Access-T. However, if you plan to use the Access-T 100-S or Access-T RDL in combination with other Access-Ts, please be aware of the following issues: •...
Page 316 Larscom Incorporated ACST-0351-S53 Supplement 3, ACST-0351-005 December 1996 Disabling Span Power Access-T 100-S and Access-T RDL are internally configured to support span power. However, there may be certain instances where span power continuity is not desired. To disable span power, perform the following steps: 1.
Page 317 ACST-0351-S53 Larscom Incorporated December 1996 Supplement 3, ACST-0351-005 Back Front Figure 1. Location of Jumper J4...
Page 318 T1. Thus, the end-to-end performance data for the individual FT1s is lost. Larscom’s Access-T RDL solves this problem by providing end-to-end perform- ance monitoring of the FT1 data path via an in-band RDL (robbed-bit data link), as illustrated in Figure 3b.
Page 319 ACST-0351-S53 Larscom Incorporated December 1996 Supplement 3, ACST-0351-005 FDL Terminated New FDL Generated at DCS by DCS FT1 DSU FT1 DSU FT1 with FT1 with 12 DS0s 12 DS0s T1 Network FT1 with FT1 with 8 DS0s 8 DS0s FT1 DSU...
Page 320 Larscom Incorporated ACST-0351-S53 Supplement 3, ACST-0351-005 December 1996 Table B. RDL Framing Format FRAME # F-BITS DATALINK CRC/ALARM DATALINK CRC-4 CRC-4 9-12 CRC-4 13-16 CRC-4 17-20 R-ALARM RDL Framing Format The RDL bit stream, shown in Table B, uses one bit per T1 frame, resulting in an 8 KHz channel.
Page 321 ACST-0351-S53 Larscom Incorporated December 1996 Supplement 3, ACST-0351-005 either 64 kbps or 56 kbps below the rate as set in the current map (depending on how the parameter is set). Both transmit and receive DTE—DTE PORT—RATE clock signals sent to the DTE port will be smooth clocks.
Page 322 Larscom Incorporated ACST-0351-S53 Supplement 3, ACST-0351-005 December 1996 • Port 1 Remote: Access-T declares a Port 1 Remote alarm when it receives a Port 1 LOF indication from the far-end device (similar to Yellow Signal). For instructions on how to set up and view alarms, refer to Chapter 6 of the Access-T Installation and Operation manual: ACST-0351-005.
Page 323 ACST-0351-S53 Larscom Incorporated December 1996 Supplement 3, ACST-0351-005 • Unavailable Second (UAS): For the RDL, this is a second that starts counting after 10 consecutive SES have occurred, and stops counting after 10 seconds in which no SES has occurred.
Page 324 Larscom Incorporated ACST-0351-S53 Supplement 3, ACST-0351-005 December 1996 For definitions and additional explanation of the standard 24-hour registers, register parameters, and one-hour statistics provided by Access-T, refer to Chapter 2, Chapter 7, and Appendix B of the Access-T Installation and Operation manual: ACST-0351-005.
Page 325 ACST-0351-S53 Larscom Incorporated December 1996 Supplement 3, ACST-0351-005 RDL Menu Options Table D lists all of the new menu paths supported by the Access-T RDL. Table D. New Access-T RDL Menu Paths Menu Path Options/Results ALARMS—SETUP—DTE—PORT 1 LOF—ENABLE NO, YES ALARMS—SETUP—DTE—PORT 1 LOF—DIAL...
Page 326 Larscom Incorporated ACST-0351-S53 Supplement 3, ACST-0351-005 December 1996 RDL DS0 Configuration Update When the configuration of DS0 bundling maps is changed and the RDL feature is turned off, the changes must be sent to the far-end Access-T. This is still done using the menu path.
Page 327 6. Limited Warranty “OEM Products” means all equipment manufactured by original Larscom warrants that its products, at the time of shipment, are equipment manufacturers other than Larscom, and may include hard- free from defects in materials and workmanship and perform in...
Page 328 ACST-6351-001 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU October 1996 Software Downloading Instructions Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU Software Downloading Instructions This document provides instructions for downloading Access-T software from a personal computer (PC), directly or via modems. Access-T software consists of two parts: Network Interface Module (NIM) software and Multiplexer Mod- ule (Mux) software.
Page 329: Required Equipment
Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU ACST-6351-001 Software Downloading Instructions October 1996 Required Equipment Downloading Access-T software requires the following equipment: • IBM PC/ AT, Tandy 1400, or compatible personal computer. Must be equipped with async card and 3.5-inch floppy disk drive.
Page 330 ACST-6351-001 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU October 1996 Software Downloading Instructions 4. Verify that each Access-T to be downloaded is configured for the appropriate hardware status and operation mode and has been given a unique node address. To verify and/or change an Access-T’s hardware status, operation mode, or node address, do the following: a.
Page 331 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU ACST-6351-001 Software Downloading Instructions October 1996 8. Using the drop-down menus as described in the Access-T manual, verify that passwords are disabled on the Access-T unit. General Downloading Procedure 1. Determine which Software Distribution Diskette is to be used. Use...
Page 332 ACST-6351-001 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU October 1996 Software Downloading Instructions when downloading to an Access-T 100-S unit. Enter when downloading to an Access-T 100-RDL unit. 6. If the port indicated in the display is not the PC COM port being used for downloading, enter and select the desired COM port as prompted.
Page 333 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU ACST-6351-001 Software Downloading Instructions October 1996 Table A. Download Program Commands (cont.) Command Description dIal Sends dial command to modem. Command prompts for dial string. In most cases the proper string is ATD followed by the number to be dialed.
Page 334 ACST-6351-001 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU October 1996 Software Downloading Instructions Specific Downloading Procedures Larscom provides five different download options. Follow the procedure for the type of download you wish to perform. Note: Do not attempt to download Access-T Series 100, 200, 400, or 1500 software to an Access-T 01/02 unit, or vice versa.
Page 335 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU ACST-6351-001 Software Downloading Instructions October 1996 The download will take approximately 15 minutes at 9600 baud for a Series 200 unit and 30 n-dnutes at 9600 for the Series 100 and 400 units.
Page 336 ACST-6351-001 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU October 1996 Software Downloading Instructions Internal Download from Flash Memory Use this procedure to download a copy of the software in flash memory to its own or another unit’s internal board(s). This download is useful if the running copy of software gets corrupted.
Page 337 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU ACST-6351-001 Software Downloading Instructions October 1996 Downloading NIM and Mux Software to Access-T 01/02 Unit Use this procedure to download the NIM and Mux code to a Access-T 01 /02 unit.
Page 338 ACST-6351-001 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU October 1996 Software Downloading Instructions If you are NOT downloading through the Chain Port, set the Chain Port address to 0. Enter and type at the prompt, followed by the key.
Page 339 Larscom Access-T 100, 200, 400, & 1500 Network Access DSU/CSU ACST-6351-001 Software Downloading Instructions October 1996 • The slaves modules’ LED blinks twice per second. STATUS When downloading to an Access-T 100-S or 100-RDL, LEDs illumi- nate and flash as follows: •...

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