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8. Testing
8-10
March 2001 3160-A2-GB24-10
Payload Loopback (PLB)
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:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
3. From the Loopback screen, select PLB.
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 8-2, Valid Loopback Combinations, for valid loopback test
combinations).
496-14316-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
ALL 1s
PLB
PORT 1PORT 2
ALL 1s
ALL
1s
F1
F2 F3
Test:
Rlpbk Lpbk Ptrns
F1
F2
F3
Loopback:
Abort LLB PLB