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4-28
3160-A2-GB21-80
March 1999
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.
F1
Loopback: DCLB
Prt1 Prt2 Prt3
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 4-8 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.
496-14314-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
ALL 1s
DTLBDTLB
PORT 1PORT 2
" Procedure
To perform a Data Terminal 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 DTLB selection
appears on the screen.