Troubleshooting
9-30 9161-A2-GH30-30
April 1998
Data Channel Loopback (DCLB)
The Data Channel Loopback (DCLB) loops the data for a particular synchronous
data port back to the interface after the information has passed all the way
through the device (i.e., just before it is sent to the Customer Premises
Equipment). Use DCLB to verify the end-to-end integrity of a circuit for a
particular port.
496-15212
Network
Interface
DSX
Port DCLBDCLB
DCE
Port 1
DCE
Port 2
All 1sAll 1s
The following tests cannot be running when a DCLB test is initiated:
HA Line Loopback, Payload Repeater Loopback or Send Pattern Test on the
same interface
HSend Pattern Test or DTE Payload Loopback on the same port
V. 54 Remote Loopback
The V.54 remote loopback commands a device to go into the data channel
loopback on the associated port.
"Procedure
To send a V.54 Remote Loopback:
1. Follow this menu selection sequence:
Main Menu
→
Test
→
Sync Data Port Tests
2. Enter the desired slot and port number.
3. Select the code Up or Down in the Send V.54 Loopback field.
4. Highlight Send under Command in the Send V.54 Loopback row. Then, press
Return to start the test. The code will be sent for up to 10 seconds, or until an
acknowledgement is received from the remote end.
5. View the length of time that the test has been running in the Results column.
6. Send the Down code to stop the remote loopback.