Starting A Payload Loopback - Paradyne 3160-A3 Operator's Manual

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.
Procedure
To perform a Payload loopback:
4-24
DSU
DTE
ALL
(DSX-1)
1s
ALL 1s ALL 1s
PORT 2 PORT 1
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
Test:
Rlpbk Lpbk
F1
3. From the Loopback screen, select PLB.
Loopback:
Abort LLB
F1
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).
February 2001
CSU
NETWORK
PLB
INTERFACE
496-14316-02
Ptrns
F2 F3
PLB
F2
F3
Combinations, for valid loopback test
3160-A2-GB21-90