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ACCULINK 316x DSU/CSU
4-8 December 1996 3160-A2-GB22-10
To perform a DTE loopback,
1.
Press F2 to select T
est from the top-level menu
screen.
F1
DS
U E
SF
Stat Test Cnfig
F2
F3
2. From the T
est screen, press F2 to select Lpbk.
F1
Test:
Rlpbk Lpbk Ptrns
F2
F3
3. From the Loopback screen, press
once to
display the DLB selection on the screen.
F1
Loopback:
Abort LLB PLB
F2
F3
4.
Press F3 to select DLB.
F1
Loopback:
LLB PLB DLB
F2
F3
Test Started appears on Line 2. If a DTE
loopback is already in progress, the
Already
Active
message appears. If an invalid combination
of loopbacks is in progress, the error message
Invalid T
est Combo
appears (see T
able 4-2 for
valid loopback test combinations).
Starting a Repeater Loopback
The Repeater Loopback command (RLB) loops the
signal being sent to the network and back to the DSX-1
Drop/Insert and data ports. The signal is looped back as
close to the network interface as possible (after it has
passed through the framing circuitry of the DSU/CSU).
Therefore, framing CRCs and BPVs are corrected. If bit
stuf
fing is enabled, pulse density is enforced.
To perform a Repeater loopback,
1.
Press F2 to select T
est from the top-level menu
screen.
F1
DS
U E
SF
Stat Test Cnfig
F2
F3
2. From the T
est screen, press F2 to select Lpbk.
F1
Test:
Rlpbk Lpbk Ptrns
F2
F3
3. From the Loopback screen, press twice to
display the RLB selection on the screen.
F1
Loopback:
Abort LLB PLB
F2
F3