American Telecom AM64/128A manual Service Test, Svc Test, Comms Evp Rx Evp Tx, Abort

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AM64/128A User Manual

Test Menu

 

 

5.4.6 In Service Test

5.4.6.1 Overview

This mode allows the error performance of the line to be monitored, without interrupting data traffic. This works by monitoring the accuracy of some of the overhead bits that make up the transmission frame structure. As the data channel itself is not monitored, the figures produced cannot accurately be extrapolated to give the data error rate, but can be used as a general guide. In order to understand this feature better, an understanding of the transmission frame structure is required. This is included as Appendix C. A brief discussion on the operation is as follows.

5.4.6.2 Operation

The display to select in the test menu is

T > In Svc Test

The mode can be exited and re-entered with no effect on any other tests or data. There are four different displays within this mode:

(1)Comms framing error display

(2)Received envelope errors

(3)Transmitted envelope errors (master only)

(4)Time of test

The SELECT and SCROLL keys operate in the same manner as in Data Test.

This mode may be left running over a long period, so an abort indication has been added to the displays. The character ‘a’ is displayed prior to the count if the test has been aborted. The monitoring is aborted when the system error rates get so high that the envelope alignment pattern / comms framing word can not be locked on to, or when the system loses line sync. (The error count would be meaningless if the line had been broken in the middle of a test). Note that the different displays may abort at different times, but the clock will stop when the first abort occurs.

The error count displays appear as follows: (refer to Appendix C for greater detail)

Comms 000000

Evp Rx 000000

Evp Tx 000000

Comms word error count.

Received envelope errors.

Transmitted envelope errors (Master mode only).

The time display simply shows the time since the test has started in seconds.

For example

Time 000010

If the count is stopped the display is

T Stop 000010

 

 

 

If the count has been aborted the display is

T Abort 000010

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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 IntroductionBaseband Modems Constructional DetailsInterface Modules 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 OffOver all Status Status MenuLoop Active No Alarm No Signal Receiving AIS No Alignment Alarm StatusLOS/CD Fail CD FailLine Rate User RateInterface Status 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 OnRemote loop from DTE Binary PatternsBin Keys Off Sending Bin 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 MenuSignalling Rate Asynchronous Mode3 G.703 Char Len Character LengthMaster Slave Configuration MenuLine Rate Modem 3 X.21 Loop ControlSynchronisation Type for software versions below Ext Byte Clk Synchronisation Type for software version V1.3 and aboveExt Bit Clk Internal ClkPower Level 5 64k ModeMenu Lock Glossary of Terms Band circuits General Specifications Way D-type X.21 V.11 Connector pin allocation Way D type X.21 bis V.24 / V.28* Connector pin allocationAppendix a Interface Pin Connections 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 E24 / V.28 bit timing cable 25 way to 25 way D type plugs 21 byte timing cable 15 way to 15 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 plugsAppendix F Troubleshooting Power 10dBm Slave Mode 64K RateMaster Mode C 64K Rate Rate 64K
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