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Maintenance
4-153360-A2-GB20-20 December 1996
Test Commands
The test commands enable you to run loopbacks and
test patterns on the E1 NTU, and to test the front panel
LEDs. These tests can help you isolate areas of trouble if
you are having problems with your E1 NTU.
To access all Test commands from the Test branch,
press F2 to select Test from the top-level menu screen.
F1
E1 HDSL NTU
Stat Test Cnfig
F2
F3
NOTE
The following procedures are
examples only. Screen displays
may vary depending on the
model and configuration of the
E1 NTU.
Remote Loopback Tests
The Remote Loopback tests enable you to troubleshoot
your circuit by sending the following to a far-end device:
• Data channel loopback up (DCLBUP) activation
sequence to initiate a V.54 Loop 2
• Data channel loopback down (DCLBDN)
deactivation sequence to terminate a V.54 Loop 2
You cannot perform remote loopbacks if any of the
local loopbacks are active. If you attempt to do so, the
error message Invld Test Combo (Invalid Test
Combination) appears.
To send a Data Channel Activation or Deactivation
loopback sequence to the far-end device,
1. From the top-level menu screen, select Test.
2. From the Test screen, select Rlpbk.
F1
Test:
Rlpbk Lpbk Ptrns
F2
F3
3. From the Rem Loopback screen, press the
Function key that corresponds to the specific
loopback test you want to perform.
F1
Rem Loopback:
DCLBUP DCLBDN
F2
F3
The Rem Loop screen appears, where Type is
either DCLBUP or DCLBDN.
F1
Rem Loop:
Type
Prt1 Prt2 Prt3
F2
F3
The DCLBUP and DCLBDN commands send the
requested sequence out the network interface on
the DS0 channels allocated to the port you select
here.
4. From the Rem Loop screen, press the desired
Function key to select the specific port. Use the
scroll keys, if necessary.
After you select a port, the sequence is sent to the
far-end device. During this time, Sending appears
on Line 2 of the LCD, followed by Command
Complete when the sequence is complete.
During the Sending message, you can press the
and keys without affecting transmission
of the loopback sequence.