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ACCULINK 317x E1 DSU/CSU
4-18 December 1996 3170-A2-GB20-20
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 T
est Combo
appears (see T
able4-8 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,
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 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 T
est Combo
appears (see T
able 4-8 for
valid loopback test combinations).