Paradyne 3163, User Manual

Page: 64 / 155

ACCULINK 3163 DSU/CSU
4-12 March 1999 3163-A2-GB20-10
Starting a Line Loopback
The Line Loopback command (LLB) loops the
received signal on the network interface back to the
network without change.
98-15946
CSU DSU
NETWORK
INTERFACE
ALL 1s
LLB
PORT 1
"
Procedure
To perform a Line 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 LLB.
F1
Loopback:
Abort
LLB PLB
F2 F3
Test Started appears on Line 2. If a line 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 4-5 for valid
loopback test combinations).
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 4-5 for
valid loopback test combinations).