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Testing
8-4
8700-A2-GB20-00
April 2000
Network Line Loopback
Network Line Loopback (LLB) loops the received signal on the network interface
back to the network without change. Also, for DSX-1 models:
H If the DSL port is in a DS0 cross-connection, corresponding DSX-1 time slots
are sent all ones.
H If the DSL port is in Bypass mode or a DS1 cross-connection, an AIS is sent
to the corresponding DSX-1 port.
CAP
DSL
Port
DSX-1
or G.703
Port
CAP T1/E1
LIU
FramerFramerTransceiver
AIS
99-16612
" Procedure
To run a Line Loopback:
1. Position the cursor at the Start command next to Network Line Loopback on
the Network & DSX-1 or Network & G.703 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.
Network Line Loopback cannot be started when another loopback or pattern test
is in progress.