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Monitoring and Testing
Starting a Data Terminal Loopback
"
4-24
The Data Terminal Loopback command (DTLB) loops the data received from
Port 1, for all DS0 channels allocated to the port, back out of the port. This
loopback occurs after the data passes through the port circuitry but before it
reaches the T1 framer.
DSU
CSU
ALL 1s
DTLB
PORT 1
Procedure
To perform a Data Terminal loopback:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
Test:
Rlpbk Lpbk
F1
3. From the Loopback screen, press the
appears on the screen.
4. Select DTLB.
Loopback:
RLB
DCLB
F1
Test Started appears on Line 2. If a Data Terminal 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).
March 1999
NETWORK
INTERFACE
98-15950
Ptrns
F2
F3
key until the DTLB selection
DTLB
F2
F3
3166-A2-GB20-20
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