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4. Maintenance
4-26
February 2001 3160-A2-GB21-90
Starting a Repeater Loopback
The Repeater Loopback command (RLB) loops the signal being sent to the
network back to the DTE Drop/Insert (DSX-1) 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). Framing CRCs and BPVs are corrected.
Procedure
To perform a Repeater loopback:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
3. From the Loopback screen, press the key until the RLB selection appears
on the screen.
4. Select RLB.
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, Valid Loopback Combinations, for valid loopback test
combinations).
496-14318-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
RLB
PORT 1 PORT 2
ALL 1s
F1
F2 F3
Test:
Rlpbk Lpbk Ptrns
F1
F2 F3
Loopback:
PLB DLB RLB