Monitoring and Testing
4-21
3166-A2-GB20-20
March 1999
Starting a Payload Loopback
The Payload Loopback command (PLB) loops the received signal on the network
interface back to the network after it has passed through the framing circuitry of
the DSU/CSU. Framing CRCs and BPVs are corrected.
98-15947
CSU
DSU
NETWORK
INTERFACE
ALL 1s
PLB
PORT 1
Procedure
To perform a Payload 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, select PLB.
F1
Loopback:
Abort
LLB
PLB
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 4-7
for valid loopback test combinations).
Содержание 3166 DSU
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