Valid loopback combinations, Starting a line loopback – Paradyne ACCULINK 316x User Manual
Page 122
ACCULINK 316x DSU/CSU
4-6
December 1996
3160-A2-GB22-10
Table 4-2
Valid Loopback Combinations
LLB
PLB
DLB
RLB
DCLB
DTLB
LLB
N/A
NO
YES
YES
NO
YES
PLB
NO
N/A
YES
NO
NO
YES
DLB
YES
YES
N/A
NO
YES
YES
RLB
YES
NO
NO
N/A
NO
YES
DCLB
NO
NO
YES
NO
YES
(on separate
ports)
YES
(on separate
ports)
DTLB
YES
YES
YES
YES
YES
(on separate
ports)
YES
(on separate
ports)
Starting a Line Loopback
The Line Loopback command (LLB) loops the
received signal on the network interface back to the
network without change.
To perform a Line loopback,
1. Press F2 to select Test from the top-level display
screen.
F1
DSU ESF
Stat
Test
Cnfig
F2
F3
2. From the Test screen, press F2 to select Lpbk.
F1
Test:
Rlpbk Lpbk
Ptrns
F2
F3
3. From the Loopback screen, press F2 to 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
Invalid Test Combo appears (see Table 4-2 for
valid loopback test combinations).