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EndRun Tempus LX GPS User Manual

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Network Time Server
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  • Page 1 "Smarter Timing Solutions" Tempus LX Network Time Server User Manual...

  • Page 3: Preface

    About EndRun Technologies EndRun Technologies is dedicated to the development and refinement of the technologies required to fulfill the demanding needs of the time and frequency community. Our innovative engineering staff, with decades of experience in the research and development of receiver technology for the Global Positioning System (GPS), has created our window-mount GPS antenna and extended hold-over oscillator-control algorithms.

  • Page 4: About This Manual

    EndRun Technologies from another country. Products not manufactured by EndRun Technologies but included as an integral part of a system (e.g. peripherals, options) are warranted for ninety days, or longer as provided by the original equipment manufacturer, from date of shipment.

  • Page 5: Warranty Repair

    If the warranty period has expired, we offer repair services for equipment you have purchased from EndRun. Call and ask for a customer service agent. It is important to contact us first as many prob- lems may be resolved with a phone call. Please have the serial number of the unit and the nature of the problem available before you call.
  • Page 6 T e m p u s L X G P S U s e r M a n u a l...

  • Page 7: Table Of Contents

    ........... . i About EndRun Technologies .
  • Page 8 ..........8 Connect the RS-232 Serial I/O Port .
  • Page 9 ..........32 Traversing the Display Structure .
  • Page 10 Chapter Six - Control and Status Commands ......41 ..........41 General Linux Shell Operation .
  • Page 11 ............. 52 unlockkp .
  • Page 12 ............80 EndRun Format .

  • Page 13: Chapter One - Introduction

    "Smarter Timing Solutions" Chapter Introduction The Tempus LX is a precision server of Universal Coordinated Time (UTC) that can be connected via a 10/100Base-T ethernet port to any TCP/IP network. In its most basic operation, it sends Network Time Protocol (NTP)/Simple Network Time Protocol (SNTP) reply packets in response to NTP/SNTP request packets which it has received from clients.

  • Page 14: Where To Use It

    C H A P T E R O N E sions are monitored from ground stations located around the world and carefully measured relative to GPS time. The results of these measurements for each satellite are then uploaded to that satellite so that they may be incorporated into the data contained in its transmissions.

  • Page 15: Chapter Two - Basic Installation

    "Smarter Timing Solutions" Chapter Basic Installation This chapter will guide you through the most basic checkout and physical installation of your Tempus LX. Subsequent chapters and appendices will give you the information needed to configure your installation for the maximum performance in your operating environment. General NTP client setup instructions will also be supplied to get you started using your Tempus LX quickly.

  • Page 16: Tempus Lx Physical Description

    This amber LED illuminates when the Tempus LX is connected to the network and flashes when receiving or transmitting packets.. Alarm LED This red LED illuminates briefly at power-up, and thereafter whenever a serious fault condition exists. 100-240V~ EndRun 0.5A. 50-60 Hz TECHNOLOGIES SERIES TEMPUS LX...

  • Page 17: Performing An Initial Site Survey

    B A S I C I N S T A L L A T I O N Alarm Jack This BNC connector (or terminal strip) provides the optional alarm (Option) output, and is usually not installed. If installed, see details in Appendix H - Specifications for the Alarm Output.

  • Page 18: Installing The Tempus Lx

    C H A P T E R T W O 2. Then it will continuously light the green Sync Status LED. 3. When the unit locks onto a GPS signal and begins to decode the timing data and adjust the local oscillator, the green Sync Status LED will flash very rapidly (about a 6 Hz rate) until the data is fully decoded and the local oscillator is fully locked to the GPS frequency.

  • Page 19: Connecting And Configuring Ethernet

    B A S I C I N S T A L L A T I O N of the DC power source. Connect the “-” terminal to the negative output of the DC power source. Note that the Tempus LX has a “floating” internal power supply, therefore either the positive or nega- tive output of the DC power source can be referenced to earth ground.

  • Page 20: Configuring Ethernet With The Serial Port

    C H A P T E R T W O Configuring Ethernet with the Serial Port To configure your ethernet interface with the serial port, after logging in as the root user, you must run a simple shell script called from the shell prompt.
  • Page 21 B A S I C I N S T A L L A T I O N These lines are the Linux bootloader boot prompt. This prompt will timeout after 5 seconds and the Linux kernel and the factory default Tempus LX root file system will be loaded. When the Linux ker- nel is loaded from FLASH memory into RAM a long list of kernel-generated, informational messages is displayed as the kernel begins execution and the various device drivers are initialized: Booting Linux with FACTORY root file system...
  • Page 22 At this point, if you do not have a DHCP server configured on your network the unit will time-out and print these messages: Tempus LX GPS DHCP Client was unable to find the DHCP Server! Fix the problem and re-boot or set up static IP address by running netconfig.

  • Page 23: Using Netconfig To Set Up Your Ip

    “root” user. After correctly entering the password at this prompt, password: the sign on message is shown. It identifies the host system as Tempus LX GPS and shows the soft- ware part number, version and build date: Tempus LX GPS 6010-0042-000 v 1.00 Wed May 9 14:17:44 UTC 2002 Tempus LX GPS (root@gntp:~)->...
  • Page 24 C H A P T E R T W O This script will configure the TCP/IP network parameters for your Tempus LX GPS. You will be able to reconfigure your system at any time by typing: netconfig The settings you make now will not take effect until you restart your Tempus LX GPS, so if you make a mistake, just re-run this script before re-booting.

  • Page 25: Verify Network Configuration

    Creating /etc/networks... Creating /etc/hosts... Creating /etc/resolv.conf... ******************************************************************************* ******************************************************************************* The Tempus LX GPS network configuration has been updated. Please re-boot now for the changes to take effect. ******************************************************************************* ******************************************************************************* Verify Network Configuration If you have made changes to your network configuration using...

  • Page 26: Check Network Operation

    If you have configured a nameserver(s) for your network, you may check that by issuing this shell command: Tempus LX GPS(root@gntp:~)-> cat /etc/resolv.conf search your.domain nameserver 192.168.1.1 nameserver 192.168.1.2 Which displays the contents of the /etc/resolv.conf file containing your domain name and the nam- eserver IP address(es) to use for that domain.

  • Page 27: Using Telnet

    After correctly entering the password at this prompt, Password: the sign on message is shown. It identifies the host system as Tempus LX GPS and shows the soft- ware part number, version and build date: Tempus LX GPS 6010-0004-000 v 1.00 Wed May 16 14:17:44 UTC 2002 Tempus LX GPS(root@gntp:~)->...

  • Page 28: Configuring The Network Time Protocol

    Configuring NTP Using the Network Interface or Serial Port The following is a transcript of the question and answer configuration utility provided by ntpcon- . The user entered parameters are underlined: Tempus LX GPS(root@gntp:~)-> ntpconfig ******************************************************************************* **********************Network Time Protocol Configuration********************** ******************************************************************************* This script will allow you to configure the ntp.conf and ntp.keys files...
  • Page 29 ---NTP Broadcast/Multicast Configuration Would you like to enable broadcast/multicast server operation? ([y]es, [n]o) y Set the network broadcast/multicast address for the Tempus LX GPS to use. broadcast mode, this address is the all 1’s address on the sub-net. Example: 111.112.113.255 For multicast operation, it is this specific address: 224.0.1.1...

  • Page 30: Configuring The Tempus Lx As A Stratum 2 Server

    Otherwise clients may easily be “spoofed” by a fake NTP server. You can specify an MD5 key number that the Tempus LX GPS will use in its broadcast/multicast packets. The clients on your network must be configured to use the same key.

  • Page 31: Chapter Three - Setting Up Ntp Clients On Unix-Like Platforms

    "Smarter Timing Solutions" Three Chapter Setting Up NTP Clients on Unix-like Platforms To configure your Unix-like computer to use your Tempus LX, you must have successfully completed the Basic Installation procedures in Chapter 2. This manual is not a ‘How-To’ on installing and using NTP;...

  • Page 32: Basic Ntp Client Setup

    C H A P T E R T H R E E Basic NTP Client Setup Basic setup is relatively simple, if: • You have been able to successfully communicate with the Tempus LX on your network. • You have installed NTP on your client computer. Configure NTP You must edit the ntp.conf file which , the NTP daemon, looks for by default in the the /etc...

  • Page 33: Create The Ntp.keys File

    S E T T I N G U P N T P C L I E N T S O N U N I X - L I K E P L A T F O R M S • You have successfully performed the Basic NTP Client Setup on your client computer. Create the ntp.keys File You must create a file named ntp.keys in the /etc directory.

  • Page 34: Broadcast/Multicast Ntp Client Setup

    C H A P T E R T H R E E You can verify that authentication is being used by issuing the command associations to display the characteristics of the client server associations. In the “auth” column of the display, you should see “OK”...
  • Page 35 S E T T I N G U P N T P C L I E N T S O N U N I X - L I K E P L A T F O R M S or the authenticated version added in MD5 Authenticated NTP Client Setup: server 192.168.1.245 key 1 Re-start to have it begin using the Tempus LX as a broadcast or multicast server.
  • Page 36 C H A P T E R T H R E E T e m p u s L X G P S U s e r M a n u a l...

  • Page 37: Chapter Four - Setting Up Ntp Clients On Windows Nt 4.0/2000/Xp

    "Smarter Timing Solutions" Four Chapter Setting Up NTP Clients on Windows NT 4.0/2000/XP To configure your Windows NT 4.0/2000/XP computer to use your Tempus LX, you must have suc- cessfully completed the Basic Installation procedures in Chapter 2. This manual is not a ‘How-To’ on installing and using NTP;...

  • Page 38: Basic Ntp Client Setup

    C H A P T E R F O U R Basic NTP Client Setup Basic setup is relatively simple, if: • You have been able to successfully communicate with the Tempus LX on your network. • You have installed NTP on your client computer. Configure NTP You must edit the ntp.conf file which , the NTP daemon, looks for by default in the the...

  • Page 39: Md5 Authenticated Ntp Client Setup

    S E T T I N G U P N T P C L I E N T S O N W I N D O W S N T 4 . 0 / 2 0 0 0 / X P MD5 Authenticated NTP Client Setup MD5 authenticated setup is relatively simple, if:...

  • Page 40: Broadcast/Multicast Ntp Client Setup

    C H A P T E R F O U R Re-start to have it begin using the Tempus LX server with MD5 authentication. By de- ntpd.exe fault, the NTP installation program installs as a service called Network Time Protocol, and ntpd.exe starts it.

  • Page 41: Configure Ntp

    S E T T I N G U P N T P C L I E N T S O N W I N D O W S N T 4 . 0 / 2 0 0 0 / X P •...
  • Page 42 C H A P T E R F O U R If you are using authentication, you can verify that authentication is being used by issuing the com- mand associations to display the characteristics of the client server associations. In the “auth” column of the display, you should see “OK”...

  • Page 43: Chapter Five - Front-Panel Keypad And Display

    "Smarter Timing Solutions" Five Chapter Front-Panel Keypad and Display This section describes the Tempus LX front-panel user interface which consists of a graphic vacuum- fluorescent display (VFD) and keypad. The keypad and display provide a convenient interface that allows the user to quickly check the operation of the instrument and setup many control parameters. If desired, the Network Administrator can disable the keypad EDIT key to prevent unauthorized tam- pering with the instrument setup.

  • Page 44: Display And Keypad Operation

    C H A P T E R F I V E Display and Keypad Operation The display is organized like the inverted tree structure shown below: Time / Status Display Main Menu Receiver Clock Opt-I/O Display Faults Network Firmware About Display System Network...

  • Page 45: Keypad Edit Lockout

    F R O N T - P A N E L K E Y P A D A N D D I S P L A Y Keypad EDIT Lockout As a security feature, the Network Administrator can disable all editing processes done through the front-panel keypad.

  • Page 46: Main Menu

    C H A P T E R F I V E System Status: Indicates either OK or flashing FAULT. A fault status indicates that one or more of the built-in fault checking processes has detected an error condition. See Faults Display in this chapter for more information. An alternate Time/Status display can be viewed by pressing the right arrow key.

  • Page 47: Reference Position

    F R O N T - P A N E L K E Y P A D A N D D I S P L A Y Carrier-to-Noise: The carrier-to-noise ratio is an indicator of the GPS signal quality. This number typically ranges from 30 to 45 dB when the instrument is locked.

  • Page 48: Antenna Fault Mask

    C H A P T E R F I V E than 55,000 will set the DAC fault flag that will appear in the fault status display. The Time/Status display will also indicate a fault condition. The oscillator type indicates the oscillator that is installed. Possible oscillator types are: Temperature-compensated crystal oscillator (TCXO) Medium-stability oven oscillator (MS-OCXO) High-stability oven oscillator (HS-OCXO)

  • Page 49: Cpu I/O Menu

    F R O N T - P A N E L K E Y P A D A N D D I S P L A Y CPU I/O Menu The CPU I/O Menu is an optional menu selected from the Main Menu. It provides access to the 1PPS Pulse Width, Time Code Output Format, and Programmable TTL Output.

  • Page 50: Network Setup

    C H A P T E R F I V E under normal operation. This fault would cause erratic operation at the next power cycling since important parameters could be corrupt. The unit should be returned to the factory for repair. FPGA FPGA Configuration - This bit indicates that the microprocessor was unable to configure the FPGA.

  • Page 51: Ntp Status

    The server is unsynchronized. NTP clients will not use a Stratum 16 server. Source: The synchronization source is named here. For the Tempus LX GPS the source is GPS, IP address of upstream source, or none. Offset: The NTP offset indicates the accuracy of the NTP system clock relative to the GPS subsystem clock.

  • Page 52: Firmware

    Linux Kernel). Use UP and DOWN to toggle between the information windows. About The About display is selected from the Main Menu and provides contact information for EndRun Technologies. The website and toll-free phone number are listed. T e m p u s L X G P S U s e r M a n u a l...

  • Page 53: Chapter Six - Control And Status Commands

    "Smarter Timing Solutions" Chapter Control and Status Commands This chapter describes the Tempus LX control and status commands. The Tempus LX supports several application-specific commands for performing initialization/setup and for monitoring the performance and status of the NTP and GPS subsystems. You do not need knowledge of Linux com- mands in order to operate the Tempus LX.

  • Page 54: Available User Commands

    C H A P T E R S I X Available User Commands COMMAND FUNCTION accessconfig Interactive shell script that guides the user in configuring access to the Tempus LX that is telnet snmpd limited to specific hosts. The resulting /etc/hosts.allow and /etc/hosts.deny files are saved to the non-volatile FLASH disk.

  • Page 55: Detailed Command Descriptions

    C O N T R O L A N D S T A T U S C O M M A N D S gpsversion Prints the GPS firmware and FPGA version information to the console. help Prints help for Tempus LX commands (not Linux). inetdconfig Interactive shell script that allows the user to configure the list of protocol servers which are started by the...

  • Page 56: Antfltmask

    C H A P T E R S I X antfltmask This command displays the current setting for the Antenna Fault Mask. Query: antfltmask Tempus LX response: Antenna Fault is ENABLED cpuopts This command displays the current settings for the installed CPU Options. Query: cpuopts Tempus LX response:...

  • Page 57: Gntphwaddr

    C O N T R O L A N D S T A T U S C O M M A N D S gntphwaddr This command displays the ethernet hardware address, if the IP network is properly configured. Oth- erwise it returns nothing.

  • Page 58: Gntptimemode

    C H A P T E R S I X +S.ssssss is the offset in seconds between the NTP system clock and the GPS subsystem clock. Positive implies that the system clock is ahead of the GPS subsystem clock. TFOM = ? A detailed explanation of TFOM is in Appendix E - Time Figure-of-Merit. Briefly, TFOM indicates clock accuracy where: time error is <...

  • Page 59: Gntpversion

    Query: gntpversion Tempus LX response: Tempus LX GPS 6010-0042-000 v 1.00 Wed Jan 16 22:38:21 UTC 2004 gpsdynmode This command displays the current GPS subsystem dynamic mode of operation. It has two possible settings: ON or OFF. When it is ON, it is assumed that the Tempus LX is installed on a moving plat- form.
  • Page 60 C H A P T E R S I X TFOM = ? A detailed explanation of TFOM is in Appendix E - Time Figure-of-Merit. Briefly, TFOM indicates clock accuracy where: time error is < 1 us time error is < 10 us time error is <...

  • Page 61: Gpstrkstat

    C O N T R O L A N D S T A T U S C O M M A N D S DAC Control Over-Range: This bit indicates that the electronic frequency control DAC for the oscillator has reached either the high (55000) or low (10000) limit while locked to the GPS sig- nal.

  • Page 62: Gpsversion

    C H A P T E R S I X Query: gpstrkstat Tempus LX response: CURRENT SVs TRKD = 08 11 13 22 31 00 00 00 gpsversion This command displays the firmware and hardware versions of the GPS subsystem. Query: gpsversion Tempus LX response:...

  • Page 63: Netconfig

    C O N T R O L A N D S T A T U S C O M M A N D S netconfig This command starts an interactive shell script that will allow the user to configure the IP network subsystem of the Tempus LX.

  • Page 64: Setsigfltmask

    C H A P T E R S I X position of the Tempus LX. By default, the unit is configured to locate itself using the GPS satellites. In some situations, visibility of the sky is limited and the unit will not be able to determine its posi- tion.

  • Page 65: Upgradegps

    C O N T R O L A N D S T A T U S C O M M A N D S Set: updaterootflag 1 Tempus LX response: UPGRADE is the default root file system. Query: updaterootflag 2 Tempus LX response: UPGRADE is the default root file system.

  • Page 66: Serial I/O Port Signal Definitions

    C H A P T E R S I X RS-232 Serial I/O Port Signal Definitions The RS-232 DB9M connector on the rear panel of the Tempus LX is wired as shown below. In order to connect the Tempus LX to another computer, a null-modem adapter must be used. The serial cable provided with the shipment is wired as a null-modem adapter and can be used to connect the Tempus LX to your computer.

  • Page 67: Chapter Seven - Ipv6 Information

    Chapter IPv6 Information EndRun Technologies understands that IPv6 is still in the experimental stage with essentially no mainstream deployment. Customers who are not interested in IPv6 need not burden your system with it. You have a choice of an IPv4-only kernel (recommended) or the IPv4/IPv6-kernel. You may freely change this at any time with an easy software download from our website.

  • Page 68: Ipv6-Capable Syslog-Ng

    C H A P T E R S E V E N IPv6-Capable syslog-ng To enable remote syslogging to an IPv6 host, you will need to edit the new /etc/syslog-ng.conf file and copy it to /boot/etc. At boot time, the presence of both the daemon and the boot/ syslog-ng etc/syslog-ng.conf file will cause the new IPv6-capable...

  • Page 69: Appendix A - Security

    "Smarter Timing Solutions" Appendix Security Your Tempus LX incorporates several important security features to prevent unauthorized tampering with its operation. Many of these are standard multiple-user access control features of the underlying Linux operating system which controls the Tempus LX. Others are provided by the additional proto- col servers selected for inclusion in your Tempus LX, and the way that they are configured.

  • Page 70: Openssh

    A P P E N D I X A The last two topics are supported on the Tempus LX by a pair of shell scripts which ease configu- ration for the inexperienced user of Unix-like operating systems. These are accessconfig inetdconfig modifies two files which are used by and the standalone daemons,...

  • Page 71: Network Time Protocol

    S E C U R I T Y In the interest of conserving scarce system memory resources, only the secure shell server daemon, and the secure copy utility, , are implemented in the Tempus LX. This means that users sshd on remote hosts may log in to the Tempus LX via an client, but users logged in on the Tempus LX are unable to log in to a remote host via...
  • Page 72 A P P E N D I X A CAUTION If you are planning to make changes to the /etc/ntp.conf file, you must not restrict query access from the local host to the NTP daemon. Various system monitoring processes running on the system require this access.

  • Page 73: Appendix B - Upgrading The Firmware

    All such downloads are freely available to our customers, without charge. After you have downloaded the appropriate FLASH binary image file from the EndRun Tech- nologies website, you are ready to perform the upgrade to your Tempus LX.
  • Page 74 A P P E N D I X B If you are using to perform the upgrade, transfer the previously downloaded file using binary transfer mode from the remote host to /dev/rootfs_1 on your Tempus LX using FTP. The root file sys- tem image will be named with the software part number and version like: 6010-0042-000_3.00.gz.

  • Page 75: Recovering From A Failed Upgrade

    U P G R A D I N G T H E F I R M W A R E downloaded was corrupt or that you forgot to set your FTP download file mode to binary when down- loading the file--either from the EndRun Technologies website or when transferring it to the Tempus Recovering from a...

  • Page 76: Performing The Gps Upgrade

    A P P E N D I X B upgradekernel /tmp/6010-0041-100.bzimage The kernel upgrade utility verifies the integrity of the file, reads the kernel version information, pres- ents it to you and asks you to verify before replacing the old kernel image. If you verify, it will then erase the old image and write the new one in its place.

  • Page 77: Problems With The Gps Upgrade

    U P G R A D I N G T H E F I R M W A R E Waiting for download using XMODEM 128 or XMODEM 1K (both with CRC). Control X will abort download. After about 3 seconds, you should see a capital ‘C’ character appear. When you do, hit the <enter> key.
  • Page 78 A P P E N D I X B Recover Command Sometimes a user will attempt to download the wrong file to the GPS Subsystem. When this happens the recovery method above will not work. After issuing the command above you will not see a series of “C”...

  • Page 79: Appendix C - Simple Network Management Protocol (Snmp)

    Management Information (SMI) object tree. Enterprise Management Information Base (MIB) In addition to providing the SNMP variables contained in MIB-II as described in RFC-1213, EndRun Technologies has implemented an enterprise MIB using the syntax of the SMI version 2 (SMIv2) as described in RFC-2578:...

  • Page 80: Invocation Of The Snmp Daemon

    A P P E N D I X C TEMPUSLXUNISON-MIB Which is located on your Tempus LX in this ASCII file: /usr/local/share/snmp/mibs/TEMPUSLXUNISON-MIB.txt In addition to a complete set of NTP and GPS status objects, the MIB defines four SMIv2 notification objects: •...

  • Page 81: Configuring Snmpv1 Trap Generation

    S I M P L E N E T W O R K M A N A G E M E N T P R O T O C O L ( S N M P ) Configuring SNMPv1 Trap Generation To have your Tempus LX send SNMPv1 traps (RFC-1215) you must configure the community and destination for SNMPv1 traps by uncommenting and editing this line in /etc/snmpd.conf: trapsink...
  • Page 82 SMI object tree. The second line defines a SNMPv3 read-only user ntpuser whose minimum security level will be authenticated but not encrypted, and who will have read-only access to the entire iso(1).org(3).dod(6).internet(1).private(4).enterprises(1).endRun- TechnologiesMIB(13827) branch of the SMI object tree. After adding the user lines to /etc/ snmpd.conf, copy it to the /boot/etc directory using...
  • Page 83 S I M P L E N E T W O R K M A N A G E M E N T P R O T O C O L ( S N M P ) secret key(s) for each of the users and delete the lines from the file.
  • Page 84 A P P E N D I X C T e m p u s L X G P S U s e r M a n u a l...

  • Page 85: Appendix D - Gps Reference Position

    Many users will not feel confident in determining their own reference position via this technique. For those users, EndRun Technologies technical support will be happy to assist you. We are familiar with the procedure and can convert your street address and zipcode information to the proper WGS-84 co- ordinates for you.
  • Page 86 A P P E N D I X D surface of the WGS-84 ellipsoid is called the geoid height or separation and has been determined by literally millions of gravitational measurements performed over its entire surface. Due to variations in the distribution of mass concentration of the earth, the geoid height varies over a range of about 100 meters.
  • Page 87 Armed with coordinates in the NAD-83 datum, you can input them to the Tempus LX via the command. setgpsrefpos The following is a sample datasheet for a benchmark that is near the EndRun Technologies facility in downtown Santa Rosa, CA: DATABASE = Sybase ,PROGRAM = datasheet, VERSION = 6.57 National Geodetic Survey,...
  • Page 88 (-31.28 meters). In this case, the ellipsoid height of the benchmark is 15.99 meters. This benchmark is .4 miles from the EndRun Technologies facility. The GPS antenna at the facility is located on the rooftop of a three story office building which would place it about 15 meters above the street level.

  • Page 89: Appendix E - Time Figure-Of-Merit (Tfom)

    "Smarter Timing Solutions" Appendix Time Figure-of-Merit (TFOM) This appendix describes the Time Figure of Merit (TFOM) number. The Tempus LX displays this number on the front panel via the Receiver Status display (see Chapter 5). The TFOM is also printed out in the time-of-day fields printed by the Tempus LX commands (see gpsstat...
  • Page 90 A P P E N D I X E T e m p u s L X G P S U s e r M a n u a l...

  • Page 91: Appendix F - Serial Time Output

    57600, 19200, 9600, and 4800. Parity selections are odd, even, and none. Format selections are Sysplex, Truetime, EndRun, EndRunX, NENA and NMEA-0183. Sysplex Format “Sysplex” means SYStem comPLEX and is a term used to describe computing on clusters of comput- ers.

  • Page 92: Truetime Format

    Local Time, then select the Truetime format. EndRun Format The time contained in this string depends on the time mode of the Tempus LX. For example, if you want the time in this string to be UTC, then set the time mode of the Tempus LX to UTC.

  • Page 93: Endrunx (Extended) Format

    S Y S P L E X O R S E R I A L T I M E O U T P U T EndRunX (Extended) Format The EndRunX format is identical to the EndRun format with the addition of two fields - the cur- rent leap second settings and the future leap second settings. The following string is sent once each second: T YYYY DDD HH:MM:SS zZZ m<CR><LF>...

  • Page 94: Nmea-0183 Format

    A P P E N D I X F NMEA-0183 Format The National Marine Electronics Association (NMEA) has developed a specification that defines the interface between various pieces of marine electronic equipment. This standard defines “sentences” that contain GPS position, navigation, time, and other information. Sentences that have been imple- mented in the Tempus LX are GGA, GLL, GSA, RMC and ZDA.
  • Page 95 S Y S P L E X O R S E R I A L T I M E O U T P U T GLL (Position Data) The GLL sentence identifies the position fix, time of position fix, and status. An example is below: $GPGLL,3827.030,N,12244.020,W,173423.00,A,A*34<CR><LF>...
  • Page 96 A P P E N D I X F RMC (Recommended Minimum Specific GPS Data) The RMC sentence identifies the UTC time of fix, status, latitude, longitude, and date. An example is below: $GPRMC,173831.00,A,3827.030,N,12244.020,W,,,200508,,,A*0D<CR><LF> Msg ID $GPRMC Field 1 173831.00 UTC time of fix (hhmmss.ss) Field 2 GPS receiver warning (A=data valid, V=data not valid)

  • Page 97: Appendix G - Third-Party Software

    "Smarter Timing Solutions" Appendix G Third-Party Software The Tempus LX is running several different software products created and/or maintained by open source projects. Open source software comes with its own license. These are printed out for your information below. The license for the GNU software project requires that we provide you with a copy of all source code covered under the GNU Public License (GPL) at your request.
  • Page 98 A P P E N D I X G recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software.
  • Page 99 T H I R D - P A R T Y S O F T W A R E b) You must cause any work that you distribute or publish, that in whole or in part contains or is de- rived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License.
  • Page 100 A P P E N D I X G the executable. However, as a special exception, the source code distributed need not include any- thing that is normally distributed (in either source or binary form) with the major components (com- piler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable.
  • Page 101 T H I R D - P A R T Y S O F T W A R E 8. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded.

  • Page 102: Ntp Software License

    A P P E N D I X G Software License Information about the NTP Project, led by Dr. David Mills, can be found at www.ntp.org. The distribution and usage of the NTP software is allowed, as long as the following copyright notice is included in our documentation: The following copyright notice applies to all files collectively called the Network Time Protocol Ver- sion 4 Distribution.

  • Page 103: Appendix H - Specifications

    "Smarter Timing Solutions" Appendix H Specifications GPS Receiver: L1 Band – 1575.42 MHz 8 Channels, C/A Code Antenna: TNC jack on rear panel, Z in = 50Ω Integral +35 dB gain LNA with bandpass filter for out-of-band interference rejection. Rugged, all-weather housing capable of operation over –40°C to +85°C temperature extremes Mounting via 18”...
  • Page 104 A P P E N D I X H Synchronization Accuracy: GPS Receiver Accuracy: <30 nanoseconds to GPS Time when locked.* ΝTP Timestamp Accuracy: <10 microseconds @ 200 packets/second (200,000 clients). NTP Client Synchronization Accuracy: Network factors can limit LAN synchronization accuracy to 1/2 to 2 milliseconds, typical.
  • Page 105 Baud Rate: User Selectable to 4800, 9600, 19200 or 57600. Parity: User Selectable to Odd, Even or None. ASCII Formats: User-Selectable to Sysplex, EndRun, EndRunX, Truetime, or NENA. Connector: Rear-panel DB-9M connector. Pinout: Pin 3 is Transmit Data. Pin 5 is GND.
  • Page 106 A P P E N D I X H CE/FCC Compliance: RTTE Directive 99/5/EC Low Voltage Directive 73/23/EC EMC Directive 89/336/EC With Amendment 93/68/EC Supplementary Compliance Data: • Safety: EN 60950;1992, A1,A2: 1993, A3: 1995, A4: 1997, A11:1998 • EMC: EN 55024 (1998), EN61000-3-2 (1995 w/A1 &...
  • Page 107 S P E C I F I C A T I O N S T e m p u s L X G P S U s e r M a n u a l...
  • Page 108 A P P E N D I X H T e m p u s L X G P S U s e r M a n u a l...

  • Page 109: Appendix I - Software Release Notes For Previous Tempus Lx Users

    Freedom of Choice EndRun Technologies understands that IPv6 is still in the experimental stage with essentially no mainstream deployment. Customers who are not interested in IPv6 need not perform the Linux T e m p u s L X G P S U s e r M a n u a l...
  • Page 110 A P P E N D I X I 2.4.31-IPV6 kernel upgrade procedure, and your systems will continue to behave as before. Custom- ers buying new products may choose to have the IPv6-capable kernel installed at the factory. The default will be the previous Linux 2.4.26 IPv4-only kernel. Performing the Upgrade Performing the 2.60 RFS upgrade is identical to the current procedure (see your User Manual, Ap- pendix B, Performing the Linux/NTP Upgrade), and must be performed first if you are also planning...
  • Page 111 S O F T W A R E R E L E A S E N O T E S The 2.60 RFS now contains the Net-SNMP open source implementation, which replaces the older UCD-SNMP implementation, which did not support IPv6. There are several new directives in the /etc/snmpd.conf related to IPv6.
  • Page 112 A P P E N D I X I T e m p u s L X G P S U s e r M a n u a l...

  • Page 113: Special Modifications - Changes For Customer Requirements

    Special Modifications Changes for Customer Requirements From time to time EndRun Technologies will customize the standard Tempus LX Network Time Server for special customer requirements. If your unit has been modified then this section will describe what those changes are.
  • Page 114 S P E C I A L M O D I F I C A T I O N S T e m p u s L X G P S U s e r M a n u a l...
  • Page 116 2270 Northpoint Parkway Santa Rosa, CA 95407 TEL 1-877-749-3878 FAX 707-573-8619 "Smarter Timing Solutions" www.endruntechnologies.com...

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