
Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual
4-2 Loopback Tests ASM-40CD Ver. 1.0
While a loopback connection is set, the TEST LED is lit up on the front panel of
both local and remote units.
Activating Loopback Tests
V.54 loopback connections are set from:
• An ASCII terminal or from an SNMP management tool
• Local or remote DTE (except for the X.21 and Ethernet digital interfaces).
For V.54 loopback settings using an ASCII terminal connected to the local unit,
refer to
Section 4.3.
Running Loopback Tests
To run a loopback test:
• Configure the modem to enable tests (see
Section 4.3
)
.
Check any alarms and alarm messages (see
Section 4.4
).
Loopback tests are best performed in the order presented here.
For details on troubleshooting ASM-40CD malfunctions using loopback tests, see
Using Loopbacks for Troubleshooting.
Before running the loopback tests:
• Verify that the data terminal is operating properly and can be used for a test.
• Do not perform tests with faulty equipment.
Ensure that all units are powered on and are configured correctly.
Local Analog Loopback (LLB)
The local analog loopback (LLB) checks the performance of the local ASM-40CD
modem, the local data terminal, and the connections between them
(see
Figure 4-1
).
LLB is activated from the DTE, RADview, or an ASCII terminal. When LLB is
initiated, the TEST LED lights up.
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