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ACCULINK 317x E1 DSU/CSU
4-16 December 1996 3170-A2-GB20-20
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 T
est from the top-level display
screen.
2. From the T
est 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
Alr
eady Active
message appears. If an invalid combination of
loopbacks is in progress, the error message
Invld
Test Combo
appears (see T
able 4-8 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. The signal is looped back as close to the DTE
Drop/Insert port as possible (after it has passed through
the framing circuitry of the E1 DSU/CSU). Therefore,
framing CRCs and BPVs are corrected.
To perform a Payload loopback,
1.
Press F2 to select T
est from the top-level menu
screen.
2. From the T
est screen, press F2 to select Lpbk.
F1
Test:
Rlpbk Lpbk Ptrns
F2
F3
3.
From the Loopback screen, press F3 to 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 T
est Combo
appears (see T
able 4-8 for
valid loopback test combinations).