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Testing
5-3
7975-A2-GB20-40
December 1998
Line Loopback
Line Loopback (LLB) loops the received signal on the network interface back to
the network without change.
98-15931
NTU/LTU
Network
Interface
All 1s
Port
Interface
Framer
EIA-530
Port
CAP
" Procedure
To run a Line Loopback:
1. Position the cursor at the Start command next to Line Loopback on the
Network Tests screen.
2. Press Enter.
The Start command is changed to Stop.
3. To manually stop the test, verify that the cursor is positioned at the Stop
command.
4. Press Enter.
Line Loopback cannot be started when a Repeater Loopback, Data Channel
Loopback (DCLB), Remote DCLB, or network-initiated Line Loopback is in
progress.