American Telecom AM64/128A Installation, BBM to BBM Link, Testing, Self Test Pass, LTU Not Ready

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Installation

AM64/128A User Manual

 

 

4.INSTALLATION

This chapter describes the basic steps that are required to set up a system involving the Baseband Modems (BBM's). There are two basic systems that will be considered:

(1)BBM connected to BBM

(2)BBM connected to Line Card

When considering the installation general pointers to the configuration of the BBM's are given. It should be noted that there are many BBM parameters which may be set differently and prevent the results from being as expected. If any results are not as discussed then chapter 5 on menu operation should be consulted. If this still fails to resolve the problem then the internal links can be checked, see appendix B.

N.B. : The mains input voltage selector switch on the back panel of the BBM is set as default to 230V. Dependant on the mains supply voltage, this may need to be reset to 120V.

If the BBM is set to 230V working and is plugged into a 120V supply, then the front panel LED’s will light but no front panel display message will appear. The BBM will stay in this state until the selector switch is correctly set.

If the BBM is plugged into a 230V supply but set to 120V working, it will not work. There is an auto- resetting thermal fuse incorporated into the unit which will trip. In order to reset the fuse the BBM should be unplugged and left to stand for thirty seconds. If the voltage selector switch is then set to 230V the BBM will operate normally.

4.1 BBM to BBM Link

With no DTE or line connected to the BBM, plug the mains cord into the IEC connector, and the mains plug into the 230V ac supply. On power up the following messages will be displayed:

Testing

for 2 seconds, all LEDs will be on

Self Test Pass

for 2 seconds, all LEDs will be on

* STATUS MENU *

for 3 seconds, all LEDs reflect status

S > LTU Not Ready

Fault LED lit, (Assuming no line connection at this point)

If the self test fails an error message will be displayed. These are explained in section 5.4.8.

The mnemonic LTU stands for Line Terminating Unit, and this should be understood (in all cases) to be the Baseband Modem itself.

For a point to point link to work, one BBM must be set to master mode, while the other BBM is set to slave mode (section 5.7.1). If the link is self contained, ie. there is a DTE at both ends and no other links are involved then it makes little difference which end is which. If another link is driven then the master modem must be connected to the external modem, (see section 5.7.3.).

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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 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 OffStatus Menu Over all StatusLoop Active No Alarm No Signal Receiving AIS No Alignment Alarm StatusLOS/CD Fail CD FailUser Rate Line 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 OnBinary Patterns Remote loop from DTEBin 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 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 Ext Byte Clk Synchronisation Type for software version V1.3 and aboveExt Bit Clk Internal 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 Power 10dBm Slave Mode 64K RateMaster Mode C 64K Rate Rate 64K
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