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Monitoring and Testing
4-23
3166-A2-GB20-10
November 1998
Starting a Data Channel Loopback
The Data Channel Loopback command (DCLB) loops the data received from the
network interface, for all DS0 channels allocated to Port 1, back to the network.
The loopback occurs after the data passes through the port circuitry but before it
is sent out the data port.
98-16103
CSUDSU
NETWORK
INTERFACE
DCLB
" Procedure
To perform a Data Channel loopback:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
F1
Test:
Rlpbk Lpbk Ptrns
F2
F3
3. From the Loopback screen, press the key until the DCLB selection
appears on the screen.
4. Select DCLB.
F1
Loopback:
PLB RLB DCLB
F2
F3
Test Started appears on Line 2. If a Data Channel loopback is already in
progress, the Already Active message appears. If an invalid combination of
loopbacks is in progress, the error message Invld Test Combo appears (see
Table 4-7 for valid loopback test combinations).