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Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics

ASM-40CD Ver. 1.0 Loopback Tests 4-3

DTE 2

DTE 1

XMT

RCV

Data

XMT

RCV

Clock

Data

Clock

SM-40CD

Figure 4-1. ASM-40CD Local Analog Loopback (LLB)

After testing the DTE connection, repeat the LLB test using BERT equipment. If

the BER test indicates an error-free data stream, but the test using DTE indicates

a fault, verify that the cable between the DTE and ASM-40CD is correctly

connected. If the problem persists follow the DTE manufacturer’s test

procedures.

To pinpoint a line problem, perform the LLB loopback at the opposite end. If both

LLB tests are error-free, the fault is in the line that is part of the LRSI-F-XX

interface modules.

After completing the test or correcting the fault, deactivate the LLB loopback.

Remote Digital Loopback (RLB)

The remote digital loopback (RLB) tests the performance of each local ASM-40CD

modem with its respective remote ASM-40 unit, as well as the line link. The

remote digital loopback sets a loop at the remote ASM-40 modem from the

terminal coupled to the local unit.

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RAD Data comm LRS-24 Spezifikationen Seite 39