Paradyne 3166 DSU, User Manual

Page: 92 / 207

Monitoring and Testing
4-24
3166-A2-GB20-20 March 1999
Starting a Data Terminal Loopback
The Data Terminal Loopback command (DTLB) loops the data received from
Port 1, 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.
98-15950
CSU DSU
NETWORK
INTERFACE
ALL 1s
DTLB
PORT 1
Procedure
To perform a Data Terminal loopback:
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
F1
Test:
Rlpbk Lpbk
Ptrns
F2 F3
3. From the Loopback screen, press the key until the DTLB selection
appears on the screen.
4. Select DTLB.
F1
Loopback:
RLB
DCLB DTLB
F2 F3
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 4-7 for valid loopback test combinations).