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Testing
5-9
7975-A2-GB20-40
December 1998
Data Channel Loopback
Data Channel Loopback (DCLB) loops the data from the network interface back
to the network. This loopback is located as closely as possible to the user data
port (DTE) interface.
98-15934
NTU/LTU
Network
Interface
Port
Interface
Framer
EIA-530
Port
CAP
All 1s
" Procedure
To run a Data Channel Loopback:
1. Position the cursor at the Start command next to Data Channel Loopback on
the SYNC Data Port 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.
Data Channel Loopback cannot be started when any of the following tests is
active: Send and Monitor 511, Line Loopback, or Repeater Loopback on the
network interface, or a Data Terminal Loopback on the data port.