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Monitoring and Testing
5-21
3162-A2-GB20-40
August 2000
Table 5-10. Valid Loopback Combinations
LLB PLB DLB RLB DCLB DTLB
LLB
N/A NO YES YES NO YES
PLB
NO N/A YES NO NO YES
DLB
YES YES N/A NO YES YES
RLB
YES NO NO N/A NO YES
DCLB
NO NO YES NO YES
(on
separate
ports)
YES
(on
separate
ports)
DTLB
YES YES YES YES YES
(on
separate
ports)
YES
(on
separate
ports)
Starting a Line Loopback
The Line Loopback command (LLB) loops the received signal on the network
interface back to the network without change.
496-14319-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
ALL 1s
LLB
PORT 1PORT 2
ALL 1s
ALL
1s
" Procedure
To perform a Line loopback:
1. From the Main Menu screen, select Test.
2. From the Test screen, select Network & DTE Tests.
3. For the Line Loopback command (under Local Loopbacks), select Start.