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Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual

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

Figure 4-2. ASM-40CD Remote Digital Loopback (RLB)

RLB is activated from a local DTE, RADview, or an ASCII terminal

When running

this test the TEST LED on the front panel of both the local and remote units is lit

up.

If the RLB test indicates a fault, but the LLB was successful for both local and

remote modems, then the line or G.703 interface on either side of the line is not

functioning properly.

Local Digital Loopback (DIG)

Local digital loopback test (DIG) determines the performance of both local

ASM-40CD and remote ASM-40, as well as the line link. The DIG loopback sets a

loop at the local modem from the terminal that is completed through the remote

unit (see

Figure 4-3

). The local digital loopback path is similar to that of the

remote digital loopback initiated from the remote unit.

DIG is activated either from RADview or an ASCII terminal. When running this test

the TEST LED on the front panel of the local unit is lit up.

Figure 4-3. ASM-40CD Local Digital Loopback (DIG)

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RAD Data comm LRS-24 Dokumentacja Strona 40