Sending A Line Loopback Up Or Down; Remote Loopback Tests - Paradyne ACCULINK 316x Operator's Manual

ACCULINK 316x DSU/CSU
When you select T1 Interface Loopbacks and
Patterns, the subsequent screen displays the Remote
Loopback, Local Loopback, Send, Monitor, and Abort
operations that are available to run on the T1 interface, as
shown in Figure 4-2. Likewise, from one of the port
selections, a similar screen appears with the same
operations that can run on the selected port, also shown in
Figure 4-2. All the local loopback tests are mutually
exclusive with the send pattern and remote loopback tests.
If you attempt to run a test that is already active or an
invalid local loopback test or test pattern combination (see
Tables 4-2 and 4-3), an error message is displayed.
The Lamp test is not available from the async terminal
interface.

Remote Loopback Tests

The Remote Loopback tests allow you to troubleshoot
your circuit by sending to a far-end DSU/CSU the
following:
For Networks,
Line loopback up code for 10 seconds (LLBUP)
Line loopback down code for 10 seconds (LLBDN)
For Channels,
V.54 activation sequence to initiate a V.54 Loop 2
(54UP)
V.54 deactivation sequence to terminate a
V.54 Loop (54DN)
ANSI T1.403 (Annex B) activation sequence to
initiate a DCLB on the remote device (FT1UP)
ANSI T1.403 (Annex B) deactivation sequence to
terminate a DCLB on the remote device (FT1DN)
You cannot perform remote loopbacks if any of the
local loopbacks are active. If you attempt to do so, the
error message Invalid Test Combo appears.
4-4

Sending a Line Loopback Up or Down

To send a Line Loopback Up or Down code on the
network to a far-end DSU/CSU,
1. Press F2 to select Test from the top-level menu
screen.
2. From the Test screen, press F1 to select Rlpbk.
3. From the Rem Loopback screen, press F1 to select
LLBUP (Line Loopback Up), or press F2 to select
LLBDN (Line Loopback Down).
The Local Loopback code is sent up or
downstream to the far-end DSU/CSU for
10 seconds. During this time, Sending appears on
Line 2 of the LCD, followed by Command
Complete when 10 seconds have elapsed.
You can press any function key to restore the Rem
Loopback screen without affecting transmission of
the loopback code.
December 1996
DSU ESF
Stat Test Cnfig
F3
F1 F2
Test:
Rlpbk Lpbk Ptrns
F3
F1 F2
Rem Loopback:
LLBUP LLBDN 54UP
F1 F2 F3
3160-A2-GB22-10