American Telecom AM64/128A manual Communication Channel Loopback, Comm Loop Off

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AM64/128A User Manual

Test Menu

 

 

However, the usage of the EEPROM (Blocks Used) is still displayed for information.

For example:

000means that the first block is in use and that there are 254 empty blocks.

254means that the last block is being used and the chip is nearly full. The failure messages have the following implications:

1.

EPROM Fail

This is a fatal error and the program will terminate.

2.

EEPROM Fail

This indicates that the internal structuring of the EEPROM data is corrupt.

If this happens an opportunity is given to reset the EEPROM.

 

To reset the EEPROM, press the select key in response to the

Reset EEPROM ?

prompt.

The consequence of resetting is that some sections of EEPROM memory may be written to more than the recommended maximum number of times, giving ultimately lower reliability of saved data.

3. EEPROM Csum Fail This indicates that data in the non-volatile memory (EEPROM) has an incorrect checksum. This can occur during normal usage if the unit was programming a new configuration when the power was turned off. Normal operation can resume, but the set up configuration must be re-entered.

5.4.9 Communication Channel Loopback

This loop is very similar to the remote loop feature in that it still applies the loopback at the remote BBM. The main difference is that the command to turn on the loop is sent via the comms channel (see Appendix C). This means there is no reliance on the status line to control the loop. The loop can therefore be applied at ALL rates. Unstructured data, or data with the status line off can be sent around this loop; whereas a normal remote loop would be cancelled as soon as the status line was turned off.

To activate this loop, press SELECT.

T > Comm Loop Off

The display should then show T > Comm Loop On

The loop should be applied and the TM LED should come on.

Note: the status menu treats this loop differently, the top level display is NOT Loop Active but Data Transfer etc.

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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 IntroductionConstructional Details Baseband ModemsInterface Modules System Overview System Overview Self Test Pass InstallationTesting BBM to BBM LinkLink Mode LTU Ready No Alarm LTU Not ReadyBBM to Line Card Link Network ModeMenu Operation Front Panel FeaturesLoop back On Loop back OffStatus Menu Over all StatusLoop Active CD Fail Alarm StatusNo Alarm No Signal Receiving AIS No Alignment LOS/CD FailUser Rate Line RateInterface Status Link Mode Network Mode Operating ModeLoc Loop On Test MenuLocal loop Local loop from menu Top level display shows Loc Loop OffLoopback On LoopbackLocal loop from DTE Loopback is applied by selecting the display Loopback OffRem Loop On Remote LoopRemote Loop from menu Rem Loop OffBinary Patterns Remote loop from DTEBin Keys Off Sending Bin Operation Error Count Bit Error Rate BER = User Data Rate x TimeData Test OverviewData Test Errors nnnnnnErrors s000001 ErrorsInjecting 1s Injection ModeTransparent Mode Injecting 0sTime If the count is stopped the display is Stop Service TestSvc Test Comms Evp Rx Evp TxSelf Test Lamp TestComm Loop Off Communication Channel LoopbackRate 4.8K Rate MenuMaster 64K BT Slave 4.8K 2 X.21bis Option MenuAsynchronous Mode Signalling Rate3 G.703 Char Len Character LengthConfiguration Menu Master SlaveLine Rate 3 X.21 Loop Control ModemSynchronisation Type for software versions below Internal Clk Synchronisation Type for software version V1.3 and aboveExt Byte Clk Ext Bit Clk5 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 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 E21 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 plugsAppendix F Troubleshooting Rate 64K Slave Mode 64K RatePower 10dBm Master Mode C 64K Rate