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Monitoring and Testing
4-21
3162-A2-GB20-30
March 1999
Starting a Data Terminal Loopback
The Data Terminal Loopback command (DTLB) loops the data received from the
selected port, for all DS0 channels allocated to the port, back out of the port. This
loopback occurs after the data passes through the port circuitry but before it
reaches the T1 framer.
496-14314-02
CSUDSU
NETWORK
INTERFACE
DTE
(DSX-1)
ALL 1s
DTLBDTLB
PORT 1PORT 2
" Procedure
To perform a Data Terminal loopback:
1. From the Main Menu screen, select Test.
2. From the Test screen, select Sync Data Port Tests.
3. In the Port field (near the top of the screen), enter either 1 or 2 depending on
the synchronous data port that you want to test.
4. For the Data Terminal Loopback command (under Local Loopbacks), select
Start.
Aborting Loopbacks
Use the Abort Tests command to stop all loopback tests or any selected loopback
test currently active on the DSU/CSU.
" Procedure
To abort one or more loopback tests:
1. From the Main Menu screen, select Test.
2. From the Test screen, select Abort Tests.
NOTE:
To verify the abort procedure, use the System and Test Status screen in the
Status branch.