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Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual
6-20 Testing ASMi-52 ASMi-52 Ver. 2.5
Figure 6-20. Loopback with Multiplexer Units
Running the Local Loopback
The local loopback (LLB) checks the performance of the local ASMi-52 modem,
the local DTE and the connection between them (see Figure 6-21). The LLB can be
performed separately on the local and remote modems.
ASMi-52 allows you to set the loopback timeout causing the LLB to deactivate
automatically after the required period of time.
Timeout set to 0 (zero) is forever. Avoid setting timeout to 0 as the local control is
lost during LLB.
Local
DTE
Data
Local ASMi-52
Data
Clock
Clock
Line
Interface
Glue
Logic
Transmit
Receive
Figure 6-21. Local Loopback
Note