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Troubleshooting
6-29
9124-A2-LB20-00
March 2000
Send Remote Line Loopback
The remote Line Loopback (LLB) up and down codes are in-band codes that
allow control of a remote device. The LLB Up code invokes a line loopback in the
remote unit while the LLB Down code terminates the remote line loopback.
Network loopbacks are defined in AT&T TR 62411.
A remote LLB cannot be started when one of the following tests is active:
H Any Loopback on the same interface.
H Send Pattern Test on this network interface or any synchronous data port
(Port Use set to Synchronous) assigned to this interface.
H Send V.54 or FT1 Loopback, or Data Channel Loopback on any synchronous
data port (Port Use set to Synchronous) and assigned to this network
interface.
H Data Channel Loopback on the frame relay link on this network interface.
" Procedure
To start and stop a Remote Line Loopback:
1. Follow this menu selection sequence:
Main Menu →Test →Network Physical Tests
2. Select the desired Network interface (shown in the screen title).
3. Select the code Up or Down in the Send Line Loopback field.
— Up – Puts a remote device in loopback.
— Down – Takes the remote device out of loopback.
4. Highlight Send and press Enter to start the test. The code is sent for
10 seconds.
5. View the length of time that the test has been running in the Result column.