Starting A Data Terminal Loopback - Paradyne 3172 Operator's Manual

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 E1 framer.
To perform a Data Terminal loopback:
"
Procedure
1. Press F2 to select Test from the top-level menu
screen.
2. From the Test screen, press F2 to select Lpbk.
Test:
Rlpbk Lpbk
F1
3. From the Loopback screen, press
to display the DTLB selection on the screen.
4. Press F3 to select DTLB.
Loopback:
RLB
F1
3170-A2-GB20-30
Ptrns
F3
F2
four times
DCLB DTLB
F2 F3
5. From the DTLB screen, press the Function key for
the port for which you want to perform the data
terminal loopback. Use the scroll keys, if
necessary.
Test Started appears on Line 2. If a Data
Terminal 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 for valid loopback test combinations).
Aborting Loopbacks
The Abort Loopback command stops all loopback tests
or any selected loopback test currently active on the E1
DSU/CSU.
To abort one or more loopback tests:
"
Procedure
1. Press F2 to select Test from the top-level menu
screen.
2. From the Test screen, press F2 to select Lpbk.
3. From the Loopback screen, press F1 to select
Abort.
March 1999
Loopback: DTLB
Prt1 Prt2 Prt3
F1 F2 F3
Test:
Rlpbk Lpbk Ptrns
F1 F2 F3
Loopback:
Abort LLB PLB
F3
F1 F2
Maintenance
4-19