Paradyne 3166 CSU, User Manual

Page: 89 / 207

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).