Troubleshooting

Send 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.

Main Menu Test Network Physical Tests

A remote LLB cannot be started when one of the following tests is active:

HAny Loopback on the same interface.

HSend FT1 Loopback or Data Channel Loopback on the synchronous data port.

HData Channel Loopback on the frame relay link on this network interface.

"Procedure

To start and stop a remote Line Loopback:

1.Select Network Physical Tests.

Main Menu Test Network Physical Tests

2.Select the code Up or Down in the Send Line Loopback field.

ÐUp ± Puts a remote device in loopback.

ÐDown ± Takes the remote device out of loopback.

3.Highlight Send and press Enter to start the test. The code is sent for 10 seconds.

4.View the length of time that the test has been running in the Result column.

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July 2000

9123-A2-GB20-10

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Paradyne 9123 manual Send Line Loopback