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4. Maintenance
4-28
February 2001 3160-A2-GB21-90
5. From the DCLB screen, press the Function key for the port for which you want
to perform the data channel loopback. Use the scroll keys, if necessary.
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 4-8, Valid Loopback Combinations, for valid loopback test
combinations).
Starting a Data Terminal Loopback
The Data Terminal Loopback command (DTLB) loops the data received from the
selected port, 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.
Procedure
To perform a Data Terminal loopback:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
3. From the Loopback screen, press the key until the DTLB selection appears
on the screen.
F1
F2
F3
Loopback: DCLB
Prt1 Prt2 Prt3
496-14314-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
ALL 1s
DTLBDTLB
PORT 1PORT 2
F1
F2 F3
Test:
Rlpbk Lpbk Ptrns