Network Device User's Guide

Monitoring and Testing

4-22

3166-A2-GB20-10

November 1998

Starting a Repeater Loopback

The Repeater Loopback command (RLB) loops the signal being sent to the

network back to the data port. The signal is looped back as close to the network

interface as possible (after it has passed through the framing circuitry of the

DSU/CSU). Framing CRCs and BPVs are corrected.

98-15948

CSUDSU

NETWORK

INTERFACE

RLB

PORT 1

ALL 1s

 Procedure

To perform a Repeater loopback:

1. From the top-level menu screen, select Test.

2. From the Test screen, select Lpbk.

Test:

Rlpbk Lpbk Ptrns

3. From the Loopback screen, press the key until the RLB selection

appears on the screen.

4. Select RLB.

Loopback:

LLB PLB RLB

Test Started appears on Line 2. If a Repeater loopback is already in

progress, the Already Active message appears. If an invalid combination of

loopbacks is in progress, the error message Invld Test Combo appears (see

Table4-7 for valid loopback test combinations).