Black Box ME759C-RJ45, ME758C-RJ45, May-95, ME759C-RJ11 manual Using the V.52 Bert Test Independently

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CHAPTER 5: Operation and Diagnostics

4.If the BERT test indicates no errors are present, move the “511/E—511” toggle switch to the left-hand position to activate the “511/E” test with periodic errors. If this test is working properly, the Error LED will blink regularly. A successful 511/E test will confirm that the loop is in place, and that the Multi-Function LD Card’s built-in 511 generator and detector are working properly.

5.If the remote BERT test indicates that errors are present, but the local analog loopback BERT tests showed that both Multi-Function LD Cards were functioning properly, there is probably a problem with the twisted- pair communication line connecting the two modems. A common problem is improper crossing of the pairs. Also, check the cable’s pinning (see Section 4.5) and continuity. If you still get errors and can’t find the cause, call your supplier for technical support (see Section 6.1).

5.4.3USING THE V.52 BERT TEST INDEPENDENTLY

The Multi-Function LD Card can perform its V.52 BERT test independently of the V.54 loopback tests. This requires two operators: one to initiate and monitor the test at the local Card, and one to do the same at the remote Card. To use the V.52 BERT test by itself, both operators should simultaneously follow these steps:

1.Move the lower front-panel toggle switch labeled “511/E—511” to the “511” (right-hand) position. This will activate the V.52 BERT test mode and transmit a 511 test pattern to the other unit. If any errors are present, the receiving modem’s Error LED will blink sporadically.

NOTE

For this independent test to work properly, the “511/E—511” switch on both Multi-Function LD Cards must be set the same way (that is, moved to the “511” position for this step and to the “511/E” position for the next step).

2.If the BERT test indicates no errors are present, move the “511/E—511” toggle switch to the left-hand position to activate the “511/E” test with periodic errors. If this test is working properly, the receiving modem’s Error LED will blink regularly. A successful 511/E test will confirm that the link is in place, and that the Multi-Function LD Cards’ built-in 511 generators and detectors are working properly.

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Contents Multi-Function LD Cards FCC Statements MULTI-FUNCTION LD Card NOM Statements Contents Specifications Indicators DiagnosticsConnectors Power TemperatureWeight FuseFeatures IntroductionOverview Introduction Setting the Switches on the Main Module Main-module switchesOn and OFF settings of the DIP switches Switch S1 SummaryS1 Positions 1 through 4 Data-Rate Setting S1 Positions 5 and 6 Clock SourceS1 Position 7 Protocol Switch S2 Summary S2 Position 2 2-Wire vs -Wire OperationS1 Position 8 Carrier-Control Method S2 Position 3 V.52 and V.54 Diagnostic Testing S2 Positions 4 and 5 RTS/CTS DelayS2-6 Signaling-Rate Range S2-7 and S2-8 Word LengthSwitch S3 Summary S3-1 and S3-2 Input ImpedanceRecommended Impedance Settings S3-4 Mode SelectionS3-5 DTE RS-232 Initiation of Local Loopback Test S3-6 DTE RS-232 Initiation of Remote Loopback TestSetting the Jumpers on the Interface Module S3-7 and S3-8 Antistream ControlFour interface modules Jumper locations Summary of Interface-Module Jumper Functions Line Interface Line Shield Connection to Frame Ground JB2Serial Interface Signal Ground and Frame Ground JB4 JB5Installation MicroRacks An OverviewMicroRacks’ Power Supply Installing the Multi-Function LD Card in the MicroRack RS-232 Serial Cables and Connectors Pinout of the RS-232 InterfacePinout of the 10-Pin RJ Interface Modem-to-Modem Line Cables and Connectors Line-Cable Pinouts AT&T standard modular color codesTwo-pair star wiring for host and slave Cards Multipoint ApplicationsOperation and Diagnostics Status LEDsRTS and CD Indicators Diagnostic Testing Using the Error LED Power-Up V.54 and V.52 Diagnostic Tests Remote Digital Loopback RDL Using the V.52 Bert Test Independently Troubleshooting Calling Your SupplierShipping and Packaging Wire Gauge Capacitance Resistance Appendix Cable RecommendationsMULTI-FUNCTION LD Card Copyright 1995. Black Box Corporation. All rights reserved
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