4. Maintenance

Starting a Payload Loopback

The Payload Loopback command (PLB) loops the received signal on the network interface back to the network. The signal is looped back as close to the DTE Drop/Insert (DSX-1) port as possible (after it has passed through the framing circuitry of the DSU/CSU). Framing CRCs and BPVs are corrected.

DSU

DTE ALL (DSX-1) 1s

CSU

PLB INTERFACENETWORK

 

 

 

 

 

 

 

 

 

 

ALL 1s

 

ALL 1s

 

 

 

 

 

496-14316-02

PORT 2

 

PORT 1

Procedure

To perform a Payload loopback:

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

2.From the Test screen, select Lpbk.

Test:

Rlpbk Lpbk Ptrns

F1 F2 F3

3. From the Loopback screen, select PLB.

Loopback:

Abort LLB PLB

F1 F2 F3

Test Started appears on Line 2. If a Payload 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 Table 4-8, Valid Loopback Combinations, for valid loopback test combinations).

4-24

February 2001

3160-A2-GB21-90

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Paradyne 3160-A3, 3165-A2, 3164-A2, 3161-B3 manual Starting a Payload Loopback