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4-23
3160-A2-GB21-80
March 1999
Starting a Line Loopback
The Line Loopback command (LLB) loops the received signal on the network
interface back to the network without change.
496-14319-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
ALL 1s
LLB
PORT 1PORT 2
ALL 1s
ALL
1s
" Procedure
To perform a Line 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, select LLB.
F1
Loopback:
Abort LLB PLB
F2
F3
Test Started appears on Line 2. If a line 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).