Philips SOPHO Call@Net Manual

Data facilities explained

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PREFACE

This manual is valid for SOPHO Call@Net (previously known as SSW 810), running on all

ISPBX models of the SOPHO iS3000 Series. All of these systems will further be referred to as

"ISPBX".

LICENSING AGREEMENT

The licensing agreement for an ISPBX determines which facilities are available. It is therefore

possible that a facility described here will not work on a specific ISPBX, even though it has

been correctly configured. Check the relevant license agreement to determine what is

available.

GENERAL NOTE

Fully Integrated Networks (FINs) are only supported by the iS3070/3090!

Summary of Contents for Philips SOPHO Call@Net

Page 1 PREFACE This manual is valid for SOPHO Call@Net (previously known as SSW 810), running on all ISPBX models of the SOPHO iS3000 Series. All of these systems will further be referred to as "ISPBX". LICENSING AGREEMENT The licensing agreement for an ISPBX determines which facilities are available. It is therefore possible that a facility described here will not work on a specific ISPBX, even though it has been correctly configured.
Page 2 INTRODUCTION The primary function of ISPBX is to provide facilities to make voice communication between telephone sets possible. In most cases these telephone sets are normal analogue sets where the speech signal is transformed into an analogue electrical signal and transferred over a 2 wire twisted pair to the ISPBX, where it is converted into a 64 kbps digital signal.
Page 3 compatible (regarding the communication protocol) a connection between the devices can be established. The connection is circuit switched, a continuously established connection between two data parties. Without the modem higher communication speeds between two internal data parties can be obtained as the modem is often the limiting factor in data communication. In larger systems, different ISPBX units are connected using 2 Mbps digital inter-unit links and the network acts as if it is one large PBX.
Page 4 If the trunk or tie line is to be used for both voice and data then another procedure must be followed. Modems are grouped into a pool and are switched into a connection when required, i.e. when a data call is in progress. 1.1.3.
Page 5 mentioned in the concerning subjects in this manual together with an indication if it is network (NE) or local (LO) data. More information about these parameters can be found in the Second Line Maintenance Manual. The boundaries are assigned a value during the projecting of the unit via the PEuu.POM file. When the value of a boundary, timer or option must be changed, this can be effected via a new projecting with an adapted PEuu.POM file.
Page 6 DATA COMMUNICATION WITHIN THE ISPBX The ISPBX acts as a data network `infrastructure' for the interconnection of end user terminals, peripherals and host computers. Transparent analogue or digital connections are established between digital peripherals in much the same way as a voice connection is established between two telephone sets.
Page 7 DCE means Data Circuit terminating Equipment, which can be a modem or one of the range of Philips SOPHO-SET, SOPHO-LAM or LAM. A DTE can be connected to the ISPBX using one of the following connections: The DTE can be connected to an Analogue Line Circuit (ALC) via a modem. In this case the modem is the DCE.
Page 8 voice or a modulated carrier with digital information. The diagram below shows the connection of two DTEs using modems. Here a single unit configuration is illustrated (one switching network). A connection made between units uses 2 Mbps inter-unit links between the switching networks. MODEM MODEM V.24...
Page 9 set is used for call set-up then the modem is connected to the line after the connection has been established. A number of important points should be remembered to enable a modem-modem connection to be established: A modem can be connected to any type of ALC. The ALC to which the modem is connected must be allocated a DNR.
Page 10 For more information: see Hardware configuration Manual and Maintenance Manual, part 3: Board Interfaces and Strap Settings. A number of important points should be remembered when making a connection between DTEs connected to DLCs: A DTE can be connected to the DLCs as listed earlier. The DLC to which the DTE is connected must be allocated a DNR.
Page 11 DTE and the ISPBX network and is therefore used as Data Circuit Terminating Equipment (DCE). A normal flat cable can be used for the connection. The full digital connection for data communication within a FIN is illustrated in figure Figure 2- 2 Full Digital Connection between Data terminals within the ISPBX.
Page 12 64 kbps V.24 V.24 2B+D 64 kbps 2B+D DLC/ DLC/ DTX-I DTX-I DNR=5401 DNR=5402 CV=3, Data CV=3, Data 64 kbps user CV3 - CV3 : allowed channel in 2mbps CV3 - CV0 : not allowed USI / USO lines 64 kbps user channel in 2B+D line V.24 DNR=5403...
Page 13 interface between the DTE and the data port; NOT between the two DTEs. Before a data call can be established, the data port must know if the DTE is ready to send or accept data. Therefore the normal on-line operations must be performed (V.24: CT 108 and CT 107 procedure;...
Page 14 programming of the data port from the DTE keyboard, the DTE must be on-line (for instance, by setting the CT108 signal of the data port on). The microprocessor of the DCE prompts the DTE for input that can be dial information or a special command to enter programming mode.
Page 15 INTERFACE CONTROL V.24 DATA RATE ADAPTION X.21 64 kbps B-channel 2B+D 16 kbps ECHO 152 kbps µP MULTIPLEXER LAMPS CANCELLER D-channel 64 kbps B-channel MEMORY V.24 DATA RATE Keyboard dialling ADAPTION X.21 INTERFACE Data port programming CONTROL Figure 2-3 Data port configuration within LAM 308 and LAM 309. INTERFACE CONTROL V.24...
Page 16 INTERFACE CONTROL V.24 DATA RATE ADAPTION KEYPAD 64 kbps B-channel 2B+D LAMPS & 16 kbps ECHO 152 kbps µP MULTIPLEXER DISPLAY CANCELLER D-channel 64 kbps B-channel MEMORY (SOPHO-SET 308 S375 D only) ANALOGUE AUDIO HANDSET DIGITAL INTERFACE CONVERTOR Keyboard dialling AT command dialling V.25bis dialling Data port programming...
Page 17 PROPRIETARY X.30 V.110 Synchronous sampling frequency: 96kHz Bits per frame : Data : Synchronisation : Synchronisation status : State of CT105 / CT109: Speed : NIC : 600/1200 bps synchronisation adaption: State of CT108 / CT107: Flow control (CT106): Table 2-1 Rate Adaptation Methods. First the two data ports try to synchronise using a synchronisation pattern in the frame structure.
Page 18 Used in : LAM 308 SOPHO-SET S375 D340 with V.24 data port LAM 309 SOPHO-SET P375 SOPHO-SET 308 SOPHO-SET P370 SOPHO-LAM P375 Data rate adaptions Philips proprietary Philips proprietary supported: X.30 V.110 V.110 Synchronous speeds supported: 1200 1200 (bps) 2400...
Page 19 DATA OQ1505 OQ1509 Ergoline 75/1200 2400 2400 2400 3600 4800 4800 4800 7200 9600 9600 9600 12000 14400 19200 19200 19200 38400 *) 38400 48000 *) 56000 *) 64000 *) *) Speeds higher than 19200 are not supported by LAMs or SOPHO-SET Table 2-2 Summary of Data Rate Adaptors.
Page 20 SOPHO-LAM P375. Two data ports are only able to communicate correctly with each other if they use the same data port set-up. This is: Transmission mode (synchronous/asynchronous); Conversation mode (full/half duplex); Transmission speed; Data format (byte length, stop bits, parity); Terminal rate adaption method;...
Page 21 2.4. X.21 X.21 is a protocol where the data transmission between the DTE and the DCE is synchronous. The transmission speeds between the DTE and DCE can be assigned between 600 and 64000 bps. The physical interface of X.21 comprises 6 lines: T-transmit data, R-receive data, S-signal element timing, B-byte timing, C-control, I-indicator.
Page 22 The DNR of the LAM is configured as a `hot line'. When the DTE goes on-line, the LAM sends a message to the ISPBX. The ISPBX now initiates the hot line facility. The ISPBX establishes a transparent connection between the DLC related to the B-channel of the dialling X.21 party and the DLC related to the B-channel of the internal X.21 destination.
Page 23 2B+D 2B+D V.24 / X.21 64 kbps 64 kbps 64 kbps 64 kbps V.24 / X.21 GATEWAY SERVER Other interface types e.g. X.25 Data network Figure 2-7 Gateway to Data Network. The ISPBX data party dials (as for an internal data calls) the DNR of the LAM circuit which is connected to the gateway server.
Page 24 This setup can lead to the following applications: Example 1 : a voice/data terminal connected to an S0 bus: B channel 0 : - BSP-ID0=2400-95 (voice/possibly voice) - BSP-ID1=2400-96 (data) B channel 1 : - BSP-ID1=2401-96 (data) This setup is very useful for a SOPHO-SET which uses B channel 0 for voice and B channel 1 for data, if there is a follow-me from BSP-ID0 to BSP-ID1.
Page 25 DATA COMMUNICATION OVER A ROUTE In the ISPBX a DTE can be connected via a modem/ALC or via a DLC/SOPHO-SET, SOPHO- LAM or LAM as discussed in chapter 2. If the DTE requests a connection to an external DTE (i.e. one connected to another PBX or to the PSTN) then a trunk or tie-line must be used. An incoming data call, initiated by an external DTE, also uses a trunk or tie-line.
Page 26 3.1.1. Data Terminal Connected to an ALC For a DTE connected to an ALC via a modem, the situation is straightforward. Because the output of the modem is an analogue signal it is possible to connect a modem directly to an ALC as indicated in figure Figure 3-1 Analogue Connection to an Analogue Trunk..
Page 27 data connection is present. The DTEs can send any type of digital information. To make the data call with an external DTE possible the following conditions must be fulfilled: The modems must be compatible with each other. The trunk access code must be included in the applicable dialling tree for the DNR for outgoing calls and/or the DNR must be included in the applicable dialling tree for the incoming traffic over the...
Page 28 ISPBX Leased line V.24 V.24 DLC/ MODEM Leased line configuration ISPBX V.24 V.24 DLC/ MODEM Trunk line Switched line configuration DCE-SOPHO-SET, SOPHO-LAM or LAM Modulated carrier. Figure 3-2 Leased Line and Switched Line configuration. These configurations are made by using a MLU or a SOPHO-LAM P375. You can make a choice between the MLU and SOPHO-LAM convertor configuration.
Page 29 support of almost all modems (including Hayes modems); support of all current asynchronous speeds up to 19200 bits/sec; support of V.110, X.30 and Proprietary Data Rate Adaption. Disadvantages: full support of only three synchronous speeds (4800, 9600 and 19200 bits/s); automatic convertor interconnection is not possible (convertor DNR and destination DNR have to be dialled).
Page 30 route behaves like a route without DDI. A connection set-up to an operator (not very useful if digital information is directly sent over the trunk line) or permanent line extension (DTE) is possible. This configuration implies that the MLU must be treated quite differently now because the analogue interface of the MLU, which is normally connected to the Modem, is not used any more.
Page 31 V.24 64 kbps 64 kbps V.24 2B+D 2B+D DLC/ DLC/ SOPHO- DTX-I DCE-SOPHO-SET, MODEM SOPHO-LAM or LAM 2B+D,( B=64kbps, user channel. SOPHO-LAM P375 release 3 in DTE mode (!) Special cable (See appendix C) Analogue Modulated carrier. Trunk line Figure 3-4 Digital Connection to an Analogue Trunk with SOPHO-LAM Convertor (Leased Line).
Page 32 automatic convertor interconnection by Predefined Destination Dialling (PDD); automatic convertor interconnection by hotline; convertor pool selection by group DNR; individual convertor selection. Automatic convertor interconnection by PDD is used for incoming leased line calls. The predefined destination is a fixed internal destination DNR stored in the LAM convertor. When the LAM convertor detects an incoming call (for example an incoming carrier), it automatically dials the DNR which is stored in it's memory.
Page 33 done the same way as making an ordinary call. A so called `maintenance terminal' can be used to change convertor settings. This terminal must be able to make an ordinary call to an individual convertor in order to change the modem settings.
Page 34 SOPHO-LAM convertors; A convertor pool may be located anywhere in the Fully Integrated Network; Each convertor type has its own programmable data rate adaption method; Philips Proprietary, X.30 or V.110. When different data rate adaption methods are required then different convertor types have to be installed, or one SOPHO-LAM with different profiles.
Page 35 Assign a DLC/DTX board using OM command ASBRDS and the correct sub-signalling groups (ASPCTB) to operate the SOPHO-LAM in DTE mode (see Appendix C); Set the board and circuits in service condition INS using OM command SETINS; Assign DNRs to the line circuits of the DLC/DTX to which the convertors are connected using OM command CHDNRC;...
Page 36 You can set this operation using Hayes command AT&S1; Connect the SOPHO-LAM to the modem with the special cable described in appendix C. Switched Line Configuration with MLU If the analogue trunk or tie-lines are to be used for both voice and data connections, then the line cannot be directly connected to a modem.
Page 37 MLU acts as the DTE in this configuration and controls the unattended modem (DCE). For more information on the MLU and convertors: see Appendix B. Modem pools are created as follows: One MLU can handle different modem types; on one MLU, the modems can belong to different modem pools;...
Page 38 V.24 64 kbps 64 kbps DLC/ V..24 2B+D 2B+D DLC/ SOPHO- DCE-SOPHO-SET, MODEM SOPHO-LAM or LAM 2B+D,( B=64kbps, user channe)l. SOPHO-LAM P375 release 3 in DTE mode (!) 64 kbps Special cable (See appendix C) Modulated carrier. Analogue 64 kbps Trunk line Figure 3-7 Digital Connection to an Analogue Trunk with SOPHO-LAM Convertor...
Page 39 response strings (silent mode). This is not valid for outgoing calls, because then the convertor modem should send response strings to the SOPHO-LAM. So, the convertor settings for incoming and outgoing calls are different. Therefore at least two convertor pools should be created. The following selection mechanisms can be used to select the SOPHO-LAM convertor: convertor group selection by group DNR;...
Page 40 MODEM V.24 64 kbps 64 kbps V.24 2B+D DLC/ SOPHO- MODEM MAINTENANCE TERMINAL 64 kbps 2B+D,( B=64kbps, user channel. SOPHO-LAM P375 release 3 in DTE mode (!) Special cable (See appendix C) Modulated carrier. Figure 3-8 Maintenance Terminal connection for changing SOPHO-LAM settings (Switched Line).
Page 41 SOPHO-LAM convertors; A convertor pool may be located anywhere in the Fully Integrated Network; Each convertor type has its own programmable data rate adaption method; Philips Proprietary, X.30 or V.110. When different data rate adaption methods are required then different convertor types have to be installed, or one SOPHO-LAM with different profiles;...
Page 42 command CHDNRS; Assign IBSC `3, 1 kHz audio' (IBSC=2) to the DNRs of the ALC using OM command CHDNRS; Assign the correct Terminal Endpoint Identifier to the SOPHO-LAMs used (TEI=0 or TEI=1; first or second B-channel respectively). For programming the TEI value refer to the Customer Engineer Manual of the SOPHO-LAM P375.
Page 43 You can set this option using Hayes command ATQ0; Connect the SOPHO-LAM to the modem with the special cable described in appendix C. 3.2. DATA COMMUNICATION OVER A DIGITAL ROUTE Various types of Digital Trunk Units (DTUs) are used to connect ISPBX to the public network. The different types are summarised in section 3.3.
Page 44 channel in the 2B+D line to the DLC/DTX. The signalling information, such as the called number, is transferred as a message in the D-channel of the 2B+D line. If the call set-up information indicates an access code towards a destination which can be reached via a DTU/DTX route, the ISPBX searches for a free circuit (timeslot) in the route and sends a message to the external network in the signalling channel.
Page 45 The internal DTE must also use a modem. In this case the normal modem pool dialling as discussed earlier is used. The 64 kbps signal from the DLC/DTX is sent to a MLU. The digital information from the DTE is retrieved from the 64 kbps signal and sent to the modem.
Page 46 A 192 kbps digital trunk or tie-line offering 2 user channels (timeslots) of 64 kbps each. A 16 kbps channel is used for the signalling for both user channels. There is 48 kbps of overhead (synchronisation etc.). Digital links are used to connect the ISPBX to other digital public or private networks. The physical interface between the digital trunk line and the ISPBX is formed by the Digital Trunk Unit (DTU) or Digital Trunk and Extension (DTX).
Page 47 comprises an Internal Service Identification Code (ISIC) and an Internal Basic Service Category (IBSC). The ISIC is passed through to the destination port. The IBSC is used for compatibility determination. For an outgoing call, the calling port supplies an ISIC, which together with the ports IBSC form an ISI.
Page 48 connection to a private network. The signalling protocol is handled by an IPH, DTU-PH, DTU- BA, DTX-I. The DTU-VC can be used for DPNSS as well, but is only suited for voice connections. For determining if the related users in both networks are compatible, a special parameter is transferred over the DPNSS No.1 link with incoming or outgoing calls.
Page 49 For an outgoing call, the calling port supplies an ISIC, which together with the ports IBSC form an ISI. The ISI is translated into a 1TR6-SI and passed over the 1TR6 link. The translation tables used are given in appendix A. For more information on the routing aspects and on the Service Indicator Code: see Facility Implementation Manual;...
Page 50 determine if the related users in both networks are compatible. For an incoming call the fixed IBSC `3.1 kHz-audio non-ISDN' (IBSC=3) is passed to the destination port and used for conectivity checking. For more information on routing aspects: see Facility Implementation Manual; Networking and Routing.
Page 51 DATA FACILITIES A data terminal connected to a line circuit (terminal connected via modem to ALC or terminal connected via SOPHO-SET, SOPHO-LAM or LAM to DLC) is regarded by the ISPBX as a normal extension. It does not distinguish between a data party and a voice party. ISPBX facilities are available for both types voice and data extensions.
Page 52 locally either via the keypad, in the case of the SOPHO-SET or SOPHO-LAM or interactively from the keyboard of the data terminal. It is also possible to program the option from the ISPBX. As the automatic answering option is part of the V.24 parameter in the CV, this option can be set in the compatibility value and downloaded to the data port of the SOPHO-SET, SOPHO-LAM or LAM.
Page 53 activity is detected over the transmit and/or receive lines within a certain, programmable time period, the SOPHO-SET or LAM sends a message to clear the call. This facility can be offered on outgoing and on incoming data calls. 4.7. DATA PROTECTION A data connection between two data terminals uses synchronisation signals for the communication protocol.
Page 54 With the OM-command CRCVAL the compatibility can be defined as `data' and the interface parameters related to the compatibility value can be defined. Via the command CHCVAL the compatibility value and the interface parameters can be changed. The DNR of the data port of the SOPHO-SET or LAM is also assigned FCM 12 (SOPHO-SET) to indicate that the dial information is to be expected in a different way (no receiver keytone required) and the call progress information is to be sent towards the data port.
Page 55 Note: As the hot line option is also part of the V.24 parameter in the CV, this option can be set in the compatibility value and downloaded to the data port of the SOPHO-SET, SOPHO- LAM or LAM. If CT 108 is used as call request, it is advised only to use the delayed hot line facility. If the hot line call set-up is not successful and CT 108 remains active the data port immediately tries to set-up a new hot line call.
Page 56 CONNECTIVITY The ISPBX acts as an integrated services PBX: it is possible to establish a digital 64 kbps transparent connection between any two ports in the fully integrated network irrespective if the parties connected to the ports are compatible. The system does not observe what is actually transferred over the connection between the ports.
Page 57 BSPT the bundle characteristics can be filled in with the OM commands CHBNDC, The maximum number of BSPTs per route is determined by NEBOUND 235. Basic Service Profile (BSP) A Basic Service Profile (BSP) is a set of user characteristics, identified by a DNR and a Basic Service.
Page 58 BSPT IBSC PRIORITY DESCRIPTION 64 kBit/s unrestricted Speech 3.1 kHz audio 3.1 kHz audio non-ISDN * 7 kHz audio Teletex Telefax4 Mixed mode Videotex Slow scan television Fernwirken GrafikTelefon Bildschirmtext Bildtelefon Bild SOPHO speech * SOPHO modem data * X.21 X.25 Bildtelefon Ton 64 kBit/s unrestricted non-...
Page 59 BSPT IBSC PRIORITY DESCRIPTION 0, 2, 5, 6, 7, 8, Data 9, 10, 11, 12, 13, 15, 16, 17 1, 14, 18 Voice 0, 1, 2, 3, 4, 5, Any (Default) 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 All BSPTs Note: On a route only one BSPT with priority 2 is allowed.
Page 60 1TR6 1TR6-Service Indicator (1TR6-SI) VN2-Service Indicator (VN2-SI) A.3. CONNECTION ALLOWANCE BETWEEN CVs A CV can be assigned to an internal port as follows: ALC or DLC-circuits: each circuit is assigned a DNR. This DNR is assigned a CV with the OM-command CHAGCV;...
Page 61 Called party CV-B Calling party CV-A Digits inside the array: 0 = Not Possible 1 = Not Allowed 2 = Convertor Required 3 = Allowed Figure A-1 CV Connection Allowance Table. A.4. CONVERTORS (MODEMS) • ISPBX Determines Convertor Type Used ISPBX determines which type of convertor (modem) must be inserted in the data path.
Page 62 Called party CV-B Calling party CV-A Digits inside the array represents the required MODEM Pool Type (0...254) for the CV-CV Combination. Figure A-2 CV-CV Convertor Type Table. A trunk line has a CV of 4 and the internal DTE has a CV of 2. The CV connection allowance is 2, which indicates `allowed with convertor' for both incoming and outgoing data calls.
Page 63 Convertor dialling can also be used internally or from DDI (prefix+convertor type+internal DNR). A.5. CV USED FOR PROGRAMMING THE DATA PORT If the CV is assigned as data then it can be related to a number of parameters which can be downloaded to a SOPHO-SET, SOPHO-LAM or LAM.
Page 64 Refer to the Customer Engineer Manual, User Guide or Data Guide for the set required. The parameters and their ranges for the LAM 309 are given below. A.5.1. LAM 309 The X.21 interface parameters for the data port of the LAM 309 are programmed in the same way as the V.24 interface parameters.
Page 65 D. DIRECT CALL. This parameter defines if the call set-up must be performed via a hot line relation (leased line) or via the entry of dial information by the user. • If this option is set to YES, the hot line relation is used. The data port sends a call set- up request towards the ISPBX as soon as the X.21 data terminal becomes active or the terminal user presses the key on the LAM 309 (depending on the `V.24'- parameter Auto Clear).
Page 66 Note: If the timer is assigned the value 000, the timer is not used any more. The data guarding is NOT active. SSS for GUARD 2. Not used for a LAM 309. Enter 000.
Page 67 MODEM LINE UNIT A modem line unit (MLU) is a board that is used to make it possible to use a modem as a common pool resource. This board controls a maximum of 4 modems. The communication between the MLU and the modem can be synchronous or asynchronous. For each modem the MLU has two ports: one port with the V.24 interface to the modem and one port with the analogue (2 or 4 wire) interface to the same modem.
Page 68 X2.3 for the detection level for modem number 2; X2.4 for the detection level for modem number 3. The board positions of the straps and the correct settings for the detection levels are given in the Maintenance Manual. A schematic overview of the MLU is given in figure Figure B-1 Schematic Overview of MLU circuit with connected Modem., with one modem connected.
Page 69 MODEM V.24 DRIVER TSET CLOCK DATA ADAPT RATE V.24 RSET RECEIVER ADAPTOR V.24 CLOCK INPUT TIMING PORT CDSL 108.1 DSRS OUTPUT PORT CODO µP CONTROL CODI CODEC Dill Switches V.25 TONE GENERATOR V.25 TONE DETECTOR 1300 Hz CALLING TONE 2100 Hz or 2225 Hz 2100 Hz or 2225 Hz ANSWERING TONE ANSWERING TONE...
Page 70 CDSL CT108.1 MODEM DATA/VOICE CT107 CONTROL CT105 TRANS/REC CT106 CONTROL TSET CT113 *) TRANSMIT CLOCK CT103 SHIFT REGISTER DSRS CT111 CT126 CT104 SHIFT DEMOD REGISTER RSET CT115 *) RECEIVE CLOCK CT109 CARRIER DETECT CT125 RING INDICATOR CT140 TEST CT142 CONTROL CT141 *) Only used with synchronous communication.
Page 71 CT104 (RXD) received data: Digital information that is received and demodulated. CT105 (RTS) request to send: The MLU wants to send digital information and initiates a request towards the modem. CT106 (RFS) ready for sending: If the MLU initiated a send request and the modem is able to send the digital information, the ready for sending signal indicates to the MLU that the information can be transmitted.
Page 72 mode). If this signal is false the low frequency band is selected for transmitting data (calling mode). This signal must be available if the modem is used both for incoming and for outgoing calls. If the modem does not support this signal, the modem pool must be assigned a call direction: incoming calls only or outgoing calls only.
Page 73 Calling party: When the calling party has fully dialled the number of the destination party, the network control establishes the call through the network and sends ring current to the called party. Called party: The receiving modem detects the ring current and sends the signal ring indicator (CT125) to the DTE.
Page 74 V.24 + V.24 + V.25 (bis) V.25 (bis) MODEM MODEM NETWORK Calling DTE Called DTE CT108 on (CDSL) Off-hook Dial tone Transfer dial information Call establishment CT125 on (ring indicator) End-of-dialling CT108 on (CDSL) Detect off hook Off hook Send calling home Detect calling tone Detect answering tone Send answering tone...
Page 75 modem provide the generation/detection of the V.25 calling tone or the generation / detection of the V.25 answering tone, the called party will immediately send the carrier in the high band. The calling modem will detect this 2400 Hz carrier and consider it to be the indication that the called party is connected.
Page 76 Two data paths are established through the switching network: From the ATU circuit to the MLU: The analogue input signal from the trunk line is digitised (A/D convertor) on the ATU board into a standard 64 kbps signal. This digitised analogue signal is sent to the MLU, via the switching network, in the USO-line.
Page 77 Note: Depending on the projecting of the MLU it can switch the CT111 circuit (DSRS) to off or on to indicate to the modem that the low or the high speed must be used. For more information: see projecting aspects. B.2.2.
Page 78 CT108.1 (CDSL) forces the modem on-line; CT111 (DSRS) is sent to the modem to indicate if the high or the low speed must be used- depending on the projecting of the MLU-circuit; CT126 (STF) is set in the off-condition to indicate the modem must send in the low- frequency band and receive in the high-frequency band (calling mode);...
Page 79 B.3.1. Outgoing Call For an outgoing call over a leased line, the procedure is the same as the seizure of a free trunk line when making an outgoing -voice- call. Therefore the MLU-circuits with the modems connected, are assigned a line number and related to a bundle, route and destination. When an internal data party wants to have access to the external data party, only the trunk access code to the destination is enough (CV connection allowance: allowed) to seize a free line (including modem) to the external data party.
Page 80 received over this `trunk line' (not an ATU-circuit), call processing does not wait for an answer signal from the `trunk line' but immediately establishes the transparent connection between the remote and the local modem. The rest of the connection set-up must be performed by the MLU and the modem: CT111 (DSRS) is sent to the modem to indicate if the high or the low speed must be used- depending on the projecting of the MLU circuit;...
Page 81 answering mode) channel. After the incoming seizure the pool-modem is inserted into the call processing state. Over a leased line NO dialling information can be received by the modem and call processing does not receive any indialling information: the leased line behaves like a trunk line without DDI. Normally the call will be routed to an operator A-queue (incoming route option) but with digital information this will not be very useful.
Page 82 the DTE may start transmitting data. The connection between the remote party and the local party is established. B.4. DIL-SWITCH SETTINGS The mode of operation of each modem can be specified using 2 groups of 8 DIL-switches (only switches 1 to 12 are used; switches 13 to 16 are not used). Switch 8: select synchronous or asynchronous communication.
Page 83 Switch 7: select the convertor or the leased line mode of the MLU-circuit. This switch must be set the same for all circuits on the MLU: all modems on the MLU are used as leased line or as convertor. Mixed modem-use on one MLU (convertor and leased line) is not possible.
Page 84 With some modem types the activation of CT108 will initiate a protocol between the DTE and the modem for dial information. In the modem pool use this is not useful. Therefore a delayed CT108 operation is introduced. When a modem out of a pool is to be inserted in the connection, first V.25 answer tone is sent to the modem and after a time period CT108 is activated.
Page 85 The MLU does not regard a carrier signal on the line (indicated by the DCD signal from the modem) as an incoming seizure. Bit 2 (speed switching call dependent): only used when modem used as convertor This bit indicates if the transmission speed of the modem can be switched between high-speed and low-speed.
Page 86 This bit is only used when bit 5 is 0 and the modem cannot be switched between calling and answering mode. The direction is fixed to outgoing and the modem is set in the calling mode (send in the low band). The direction is fixed to incoming and the modem is set in the answering mode (send in the high band).
Page 87 BYTE VALUE HEXADECIMAL DECIMAL SPEED [bps] 1200 2400 3600 4800 7200 9600 12000 1200 / 75 14400 19200 38400 48000 56000 64000 Table B-4 Relation byte 0 - convertor speed. Because the projecting bits of the subsignalling group are not all used for both the leased line and convertor configuration, it is useful to display the relation between these bits.
Page 88 B.6. STANDARD SIGNALLING GROUPS A number of standard signalling groups are available where the projecting bits and byte are assigned the correct values for specific operation modes. See diagram Figure C-8 B.6.1. Modem used as Convertor When the modem is used in the convertor configuration, the most important bit is bit 0 which determines if the modem is used as convertor or leased line.
Page 89 - CT111 switched). The speed is switched to the high speed if the CV-speed indicates the communication speed is 2400 bps or higher. The speed is switched to the low speed if the CV-speed indicates the communication speed is less than 2400 bps. BIT 0 BIT 1 BIT 2...
Page 90 BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BYTE 0 H`FF' don't care don't care • 1612 Modem is used as a pool-modem in the leased line configuration for outgoing calls only: the MLU expects a constant carrier on the line and guards the line. When transmitting the modem uses the low band (STF - CT126 off).
Page 91 Modem is used as a pool-modem in the leased line configuration for outgoing calls only: the MLU expects a constant carrier on the line and guards the line. When transmitting the modem uses the high band (STF - CT126 on). The communication speed is fixed to high speed (DSRS - CT111 on).
Page 92 BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BYTE 0 H`FF' don't care don't care don't care • 1624 Modem is used as a pool-modem in the leased line configuration for both incoming and outgoing calls: the MLU does not expect a constant carrier on the line.
Page 93 SOPHO-LAM CONVERTOR The SOPHO-LAM P375 convertor can be used instead of the MLU convertor. This appendix describes the details of the SOPHO-LAM convertor configuration. Chapter 3 contains the general information. C.1. DTE-MODE When the SOPHO-LAM P375 (release 3) is used in a convertor configuration it has to operate in `DTE mode'.
Page 94 When the SOPHO-LAM wants to make an outgoing call, it activates CT107. The modem detects an active signal on CT108, now there are two possibilities: in CT108.1 mode (Connect Data Set to Line) the convertor modem sets up the connection with the remote modem; in CT108.2 mode (Data Terminal Ready) the modem waits for dial information (for example Hayes commands).
Page 95 PARAMETERS DEFAULT PARAMETERS DEFAULT SETTINGS SETTINGS CT108 as request: Incoming guard (sec): 60 seconds CT108 assumed on: Xon character: CT105 as request: Xoff character: CT103 as request Transmission: Asynchronous CT107 as clear: Mode: Full duplex CT107 assumed on: Speed: 1200 bits/sec Auto answer: Format (bits): 8 bits...
Page 96 specifications). This means the following: CT107 is OFF in the idle state; CT107 goes OFF when the Hang Up process is started; CT107 goes ON as soon as the connection set up is started; CT107 goes ON in the V.25(bis) dialog mode. Note: Different convertor settings are used for the leased and switched line configuration.
Page 97 CABLE CONNECTOR CABLE CONNECTOR AT SOPHO-LAM SIDE AT MODEM SIDE Circuit Circuit CT103 - A B - CT103 CT104 - B A - CT104 CT105 - C I - CT105 CT115 - D L - CT115 CT141 - E J - CT141 Seen from wiring side CT107 - F H - CT107...
Page 98 SOPHO-LAM CONNECTOR MODEM CONNECTOR CIRCUIT MNEMON CIRCUIT MNEMON CT102 Connected to 7 CT102 CT104 Connected to 2 CT103 CT103 Connected to 3 CT104 CT109 Connected to 4 CT105 CT105 Connected to 8 CT109 CT108 Connected to 6 CT107 CT107 Connected to 20 CT108 CT113 TSET...
Page 99 V.24 2B+D 64 kbps 64 kbps 2B+D V.24 DLC/ DLC/ SOPHO- DTX-I DTE-A TA-A TA-B DCE-SOPHO-SET, MODEM SOPHO-LAM or LAM MODEM - A MODEM V.24 DTE-B PSTN Leased line MODEM - B 2B+D,( B=64kbps, user channel. SOPHO-LAM P375 release 3 in DTE mode (!) Special cable (See appendix C) Modulated carrier.
Page 100 the user guide of the SOPHO-LAM P375 and the modems used. C.3.1. Incoming Call When DTE-B activates CT108, MODEM-B sends a carrier over the line to MODEM-A. When MODEM-A detects the incoming carrier, it answers the call automatically and activates both CT107 and CT109 (CT108 of MODEM-A is continously ON).
Page 101 Clear'. So, DTE-B can clear the call by sending a break sequence. When DTE-B uses Hayes command ATH0 (hang up) and the SOPHO-LAM is in the Hayes mode, then the SOPHO-LAM goes on hook and the digital connection through the switch is cleared.
Page 102 V.24 64 kbps 64 kbps V.24 2B+D 2B+D DLC/ DLC/ SOPHO- DTX-I DTE-A TA-A TA-B DCE-SOPHO-SET, MODEM SOPHO-LAM or LAM MODEM - A 64 kbps 64 kbps MODEM V.24 DTE-B PSTN Trunk line MODEM - B 2B+D,( B=64kbps, user channel. SOPHO-LAM P375 release 3 in DTE mode (!) Special cable (See appendix C) Modulated carrier.
Page 103 AT&D2). The convertor modems in a pool for outgoing calls should be configured as follows: Switched line configuration; non-silent mode (result codes enabled, Hayes command ATQ0); CT107 indicates the state of the analogue connection (according to the V.24 specification, Hayes command AT&S1); when CT108 changes from ON to OFF the modem must go on hook (Hayes command AT&D2).
Page 104 USER-A DIGITAL CONNECTION CONVERTOR ANALOGUE CONNECTION USER-B DTE-A TA-A ISPBX SOPHO-LAM MODEM-A ISPBX MODEM-B DTE-B CT108 OFF HOOK Call request RINGING CT105 CT141 CT125 SETUP when using CT107 hot line or CT108 ANSWER ANSWER CT107 CT108 CT107 CARRIER CT109 CT105 CT109 SETUP INC.
Page 105 Note that CT105 can only be used as call request provided CT108 and CT107 of the SOPHO-LAM are ON. It is useful to use CT105 as call request when the connection can not be cleared via CT107 of MODEM-A. In this case you can clear the connection via CT109 of MODEM-A. When CT103 is used as call request, DTE-B can initiate a call request by typing some characters.
Page 106 USER-A DIGITAL CONNECTION CONVERTOR ANALOGUE CONNECTION USER-B DTE-A TA-A ISPBX SOPHO-LAM MODEM-A ISPBX MODEM-B DTE-B CT108 SETUP SETUP INC. CALL CT107 OFF HOOK when modem CT108 ANSWER operates in CONNECT CT108.1 mode SYNCHRONISATION CT105 VIA FRAME BIT CT109 CT105 OFF HOOK CT108.2 mode RINGING...
Page 107 go off hook after receiving an active CT108. After the connection between DTE-A and the SOPHO-LAM is established, DTE-A can dial the number of DTE-B using one of the dial options of MODEM-A, for example Hayes commands. MODEM-B detects an incoming call and activates CT125. In return DTE-B activates CT108 and MODEM-B answeres the call.
Page 108 DTE-A clears the call by deactivating CT108 (for example). As a result TA-A goes on hook and a `Clear' message is passed through to the SOPHO-LAM. After reception of this message the SOPHO-LAM deactivates CT109 and CT107. In return MODEM-A goes on hook and deactivates CT107.
Page 109 Figure C-8...

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