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4. Maintenance
4-20
February 2001 3160-A2-GB21-90
Sending a Line Loopback Up or Down
Procedure
To send a Line Loopback Up or Down sequence on the network to a far-end
DSU/CSU:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Rlpbk.
3. From the Rem Loopback screen, press F1 to select LLBUP (Line Loopback
Up), or press F2 to select LLBDN (Line Loopback Down).
The Line Loopback sequence is sent up or downstream to the far-end
DSU/CSU for 10 seconds. During this time,
Sending
appears on Line 2 of the
LCD, followed by
Command Complete
when 10 seconds have elapsed.
You can press any function key to restore the Rem Loopback screen without
affecting transmission of the loopback code.
F1
F2
F3
Test:
Rlpbk Lpbk Ptrns
F1
F2
F3
Rem Loopback:
LLBUP LLBDN 54UP