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.
F1
Test:
Rlpbk Lpbk Ptrns
F2 F3
3. From the Loopback screen, press the key until the RLB selection
appears on the screen.
4. Select RLB.
F1
Loopback:
LLB PLB RLB
F2 F3
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).