Interface Modules | American Telecom AM64/128A manual

AM64/128A User Manual	Appendix B – Internal Link Settings

Interface Modules

X.21 Interface Module:

J1 – Circuit 103 Termination.

J2 - Circuit 113 Termination.

J1 - X.21 T (Transmit data) Circuit Termination – This link connects a 120 ohm load resistor across the T circuit position 1-3. This helps maintain signal rise times and minimises reflections at rates greater than 9.6 kbps over long lines. At lower rates and over short lines the termination resistor may be omitted, (link set position 1-2).

J2 – X.21 SEXT (External Signal Element Timing) Circuit Termination – This link connects a 120 ohm load resistor across the SEXT circuit in position 1-3. This helps maintain signal rise times and minimises reflections at rates greater than 9.6 kbps over long lines. At lower rates and over short lines the termination resistor may be omitted, (link set position 1-2).

V.35 Interface Module:

Removable link shown joining pins 1-2, to reverse connection of A and B wires to Circuit 113 move link to position 1-3.

J1 – V35 Circuit 113 (External Signal Element Timing) Input Polarity Selection – This aspect of the V35 interface may be implemented differently by different manufacturers. This link allows the authorised personnel to swap the polarity of the A and B wires of this differential input circuit. The factory default setting for this position 1-2.

V.36 Interface Module:

J1 – Circuit 103 Termination.

J2 – Circuit 113 Termination.

A-6

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American Telecom AM64/128A manual Interface Modules

Contents

Base Band Modem ATL Part No /203/002/610 Issue 4 September Information Contained This Document is Confidential to Contents Appendix B International Models Introduction Constructional Details Baseband ModemsInterface Modules System Overview System Overview Testing InstallationBBM to BBM Link Self Test Pass Link Mode LTU Ready No Alarm LTU Not Ready BBM to Line Card Link Network Mode Menu Operation Front Panel Features Loop back On Loop back Off Status Menu Over all StatusLoop Active No Alarm No Signal Receiving AIS No Alignment Alarm StatusLOS/CD Fail CD Fail User Rate Line RateInterface Status Link Mode Network Mode Operating Mode Local loop Test MenuLocal loop from menu Top level display shows Loc Loop Off Loc Loop On Local loop from DTE LoopbackLoopback is applied by selecting the display Loopback Off Loopback On Remote Loop from menu Remote LoopRem Loop Off Rem Loop On Binary Patterns Remote loop from DTEBin Keys Off Sending Bin Data Test Error Count Bit Error Rate BER = User Data Rate x TimeOverview Operation Errors s000001 Errors nnnnnnErrors Data Test Transparent Mode Injection ModeInjecting 0s Injecting 1s Svc Test Service TestComms Evp Rx Evp Tx Time If the count is stopped the display is Stop Self Test Lamp Test Comm Loop Off Communication Channel Loopback Rate 4.8K Rate Menu Master 64K BT Slave 4.8K 2 X.21bis Option Menu Asynchronous Mode Signalling Rate3 G.703 Char Len Character Length Configuration Menu Master SlaveLine Rate 3 X.21 Loop Control ModemSynchronisation Type for software versions below Ext Byte Clk Synchronisation Type for software version V1.3 and aboveExt Bit Clk Internal Clk 5 64k Mode Power LevelMenu Lock Glossary of Terms Band circuits General Specifications Way D type X.21 bis V.24 / V.28* Connector pin allocation Way D-type X.21 V.11 Connector pin allocationAppendix a Interface Pin Connections Way D-type V.36 Connector pin allocation Mrac Connector Pin allocation Line Connector Way D-type RS-530 Connector pin allocation Appendix B Internal Link Settings Page Interface Module Interface Modules 21bis Interface Module RS530 Interface Module Frame Structure Service Test Facilities Appendix C In Service Test TTE Network and Safety statements LVD Safety Statements 21 bit timing cable 15 way to 15 way D type plugs Appendix E 21 byte timing cable 15 way to 15 way D type plugs 24 / V.28 bit timing cable 25 way to 25 way D type plugs35 bit timing cable 34 way to 34 way Mrac plugs RS530 bit timing cable 25 way to 25 way D type plugs 21 bis V.36 bit timing cable 37 way to 37 way D type plugs Appendix F Troubleshooting Power 10dBm Slave Mode 64K RateMaster Mode C 64K Rate Rate 64K