
ACCULINK 3172 and 3174 E1 DSU/CSU
4-18
March 1999
3170-A2-GB20-30
3. From the Loopback screen, press
twice to
display the RLB selection on the screen.
F1
Loopback:
Abort
LLB
PLB
F2
F3
4. Press F3 to select RLB.
F1
Loopback:
PLB
DLB
RLB
F2
F3
Test Started appears on Line 2. If a Repeater
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 4-8
for
valid loopback test combinations).
Starting a Data Channel Loopback
The Data Channel Loopback command (DCLB) loops
the data received from the network interface, for all DS0
channels allocated to the selected port, back to the
network. The loopback occurs after the data passes
through the port circuitry but before it is sent out the data
port.
To perform a Data Channel loopback:
"
Procedure
1. Press F2 to select Test from the top-level menu
screen.
2. From the Test screen, press F2 to select Lpbk.
F1
Test:
Rlpbk Lpbk
Ptrns
F2
F3
3. From the Loopback screen, press
three times
to display the DCLB selection on the screen.
F1
Loopback:
Abort
LLB
PLB
F2
F3
4. Press F3 to select DCLB.
F1
Loopback:
DLB
RLB
DCLB
F2
F3
5. From the DCLB screen, press the Function key for
the port for which you want to perform the data
channel loopback. Use the scroll keys, if
necessary.
F1
Loopback: DCLB
Prt1
Prt2
Prt3
F2
F3
Test Started appears on Line 2. If a Data Channel
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 4-8
for
valid loopback test combinations).
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