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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
CSUDSU
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
CSUDSU
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).