Testing
5-10
7110-A2-GB20-00
June 1997
Data Channel Loopback
Data Channel Loopback (DCLB) loops the data from all network DS0 channels
assigned to the port back to the network. This loopback is located as closely as
possible to the User Data Port (DTE) interface.
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.
3. The Start command is changed to Stop. If you want to manually stop the test,
verify that the cursor is positioned at the Stop command.
DSU
CSU
Network
Port
97-15403
DTE
Port
DCLB
Data Channel Loopback cannot be started when any of the following tests are
active: Line, Payload, or Repeater Loopback on the network interface, or a DTE
Payload loopback on the data port.