Specifications

Chapter 5 Troubleshooting and Diagnostics Installation and Operation Manual
5-6 Testing ASMi-31 ASMi-31 Ver. 3.0
Data
Local ASMi-31 Remote ASMi-31
Data
Clock
Clock
Line
Interface
Line
Interface
Transmit
Receive
Receive
Transmit
Remote
DTE
Local
DTE
Figure 5-4. Remote Digital Loopback
 To activate the remote digital loopback:
1. Initiate remote loopback via TESTS > RLB > ON (see
Figure 5-5 ).
The TST LED on each ASMi-31 front panel lights up. The receive output of
the remote modem is looped back to the transmitter.
You can also activate the remote digital loopback via the appropriate pin of the
DTE interface. The loopback activation via the DTE pins is not available for the
X.21, G.703 and Ethernet interfaces.
2. Perform the RLB test as explained above for the local analog loopback test.
If an error occurs, but the local analog loopback test was successful for both
the local and remote modems, it can be assumed that the line of the local or
the remote unit is not operating properly.
3. After completing the test or correcting the fault, deactivate the remote
loopback.
TESTS
LOC
RLB *ON
LLB
RLB
REM
LLB+BERT
LOC
RLB+BERT
BERT
LEDS TEST
Figure 5-5. Initiating Remote Loopback
Note