Paradyne 3166 CSU - Manual (Page 87)

Monitoring and Testing
4-21 3166-A2-GB20-10 November 1998
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).