American Telecom AM64/128A manual Introduction, International Models

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Introduction	AM64/128A User Manual

1.INTRODUCTION

This manual applies to the AM 64/128A Baseband Modem. This modem is manufactured in the U.K. by ATL Telecom Ltd.

There are six variants, each with a different physical data interface circuit. The ATL Telecom Ltd. part numbers for these variants are as follows :-

•

AM 64/128A - X.21 :

1/203/102/100

•AM64/128A - X.21bis : 1/203/202/100

•	AM64/128A - V.35 :	1/203/302/100
•	AM64/128A - V.36 :	1/203/402/100

•AM64/128A - RS530 : 1/203/502/100

•AM64/128A - G.703 : 1/203/602/100

The unit should have an identifying label carrying this number attached to the under side.

Separate interface modules can also be purchased in order to modify the units for operation with a different DTE interface at a later date.

The BBM can provide synchronous communications at user data rates between 2.4kbps and 128kbps over a 2 wire twisted pair cable. Asynchronous communication is also provided at data rates up to 19.2kbps.

The BBM can easily be configured using the front panel keys in conjunction with the Liquid Crystal Display (LCD). The display is operated in a menu type fashion with easy to understand mnemonics, which should make constant reference to this hand book unnecessary.

Once configured the operation of the BBM is totally automatic, and in the event of line disturbances the data link is immediately restored without operator intervention.

Chapter 4 (Installation) describes the basic set up procedure and this should be read prior to setting up any link.

Chapter 5 (Menu Operation) is much more detailed, but should be read to gain an understanding of the full range of menu facilities available.

The unit is approved for connection to private digital circuits adhering to the X.21 or X.21bis recommendations (PTO service categories 1 and 2, all rates). Connection of the unit to such circuits is described more fully in appendix E.

INTERNATIONAL MODELS

Modifications to line cords and power supply leads are available for country specific requirements. In such cases, line cord pin outs may be different. The basic model is the same, line cords and power cords are separate plug-in items.

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Contents Base Band Modem ATL Part No /203/002/610 Issue 4 SeptemberInformation Contained This Document is Confidential to Contents Appendix B International Models IntroductionInterface Modules Constructional DetailsBaseband Modems System Overview System Overview Testing InstallationBBM to BBM Link Self Test PassLink Mode LTU Ready No Alarm LTU Not ReadyBBM to Line Card Link Network ModeMenu Operation Front Panel FeaturesLoop back On Loop back OffLoop Active Status MenuOver all Status No Alarm No Signal Receiving AIS No Alignment Alarm StatusLOS/CD Fail CD FailInterface Status User RateLine Rate Link Mode Network Mode Operating ModeLocal loop Test MenuLocal loop from menu Top level display shows Loc Loop Off Loc Loop OnLocal loop from DTE LoopbackLoopback is applied by selecting the display Loopback Off Loopback OnRemote Loop from menu Remote LoopRem Loop Off Rem Loop OnBin Keys Off Sending Bin Binary PatternsRemote loop from DTE Data Test Error Count Bit Error Rate BER = User Data Rate x TimeOverview OperationErrors s000001 Errors nnnnnnErrors Data TestTransparent Mode Injection ModeInjecting 0s Injecting 1sSvc Test Service TestComms Evp Rx Evp Tx Time If the count is stopped the display is StopSelf Test Lamp TestComm Loop Off Communication Channel LoopbackRate 4.8K Rate MenuMaster 64K BT Slave 4.8K 2 X.21bis Option Menu3 G.703 Asynchronous ModeSignalling Rate Char Len Character LengthLine Rate Configuration MenuMaster Slave Synchronisation Type for software versions below 3 X.21 Loop ControlModem Ext Byte Clk Synchronisation Type for software version V1.3 and aboveExt Bit Clk Internal ClkMenu Lock 5 64k ModePower Level Glossary of Terms Band circuits General Specifications Appendix a Interface Pin Connections Way D type X.21 bis V.24 / V.28* Connector pin allocationWay D-type X.21 V.11 Connector pin allocation Way D-type V.36 Connector pin allocation Mrac Connector Pin allocationLine Connector Way D-type RS-530 Connector pin allocationAppendix B Internal Link Settings Page Interface Module Interface Modules21bis Interface Module RS530 Interface ModuleFrame Structure Service Test FacilitiesAppendix C In Service Test TTE Network and Safety statements LVD Safety Statements21 bit timing cable 15 way to 15 way D type plugs Appendix E35 bit timing cable 34 way to 34 way Mrac plugs 21 byte timing cable 15 way to 15 way D type plugs24 / V.28 bit timing cable 25 way to 25 way D type 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 plugsAppendix F Troubleshooting Power 10dBm Slave Mode 64K RateMaster Mode C 64K Rate Rate 64K