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Monitoring and Testing
4-18
3162-A2-GB20-30
March 1999
Starting a Payload Loopback
The Payload Loopback command (PLB) loops the received signal on the network
interface back to the network. The signal is looped back as close to the DTE
Drop/Insert (DSX-1) port as possible (after it has passed through the framing
circuitry of the DSU/CSU). Framing CRCs and BPVs are corrected.
496-14316-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
ALL 1s
PLB
PORT 1PORT 2
ALL 1s
ALL
1s
" Procedure
To perform a Payload loopback:
1. From the Main Menu screen, select Test.
2. From the Test screen, select Network & DTE Tests.
3. For the Payload Loopback command (under Local Loopbacks), select Start.
Starting a DTE Loopback
The DTE Loopback command (DLB) loops the received signal on the DTE
Drop/Insert (DSX-1) port back to the DTE without change.
496-14317-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
DLB
PORT 1PORT 2
ALL 1s
" Procedure
To perform a DTE loopback:
1. From the Main Menu screen, select Test.
2. From the Test screen, select DTE Tests.
3. For the DTE Loopback command (under Local Loopbacks), select Start.