American Telecom AM64/128A Alarm Status, No Alarm No Signal Receiving AIS No Alignment, CD Fail

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AM64/128A User Manual	Alarm Status

5.3.2 Alarm Status

The possible messages for this item are:

S > No Alarm

S > No Signal

S > Receiving AIS

S > No Alignment

The S > No Signal display indicates that the transmission system cannot find a signal to lock on to.

Possible causes are:

(a)Broken or defective line

(b)Both ends master, or both ends slave

(c)Incorrect line rate

(d)Line attenuation / noise level too high

The

S > Receiving AIS

display indicates that an AIS (Alarm Indication Signal) pattern is being

received from the line. This should not normally occur in a BBM to BBM link, but can be generated if the master BBM is in 64k mode whilst sending binary 1’s.

If the alignment pattern from the line cannot be locked onto, the display reads:

S > No Alignment

Possible causes are :
(a) Line attenuation / noise level too high.	(b) Incorrect set up of X.50 modes.

S > LOS/CD Fail

This is a G.703 Interface message display indicating that there is loss of

synch or line break transmission fault, and there is no G.703 receive signal present.

S > CD Fail

This is a G.703 Interface message display indicating that there is no G.703

receive signal present, but that the transmission circuit is in synchronisation.

S > Line LOS This is a G.703 Interface message display indicating that there is loss of synch or a line break transmission fault, but there is a G.703 receive signal present.

If none of these conditions apply then the message is:	S > No Alarm

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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