5-10
Issue 9 October 1998
363-206-204
Release 6 Installation Tests
!
WARNING:
Unterminated optical connector may emit laser radiation. Do not view
beam with optical instruments. Avoid direct exposure to beam.
NOTE
:
After completing the shelf test, isolate and replace any failed units. If any
units are replaced, repeat the LED test and local equipment test until both
tests pass without failures.
NOTE
:
If the shelf is not fully equipped, move circuit packs around and repeat the
test. Test all circuit pack positions.
Preparation Procedure
1. If the DDM-2000 OC-3 is in an RT, change the timing mode on the BBF2/
BBF2B (TGS) circuit packs from loop timed to free running. If the timing
mode is changed, press the UPD/INIT pushbutton on the SYSCTL after the
change is completed.
2. Fully insert the OLIUs into the shelf.
3. Connect the OLIU OUT to the OLIU IN of each OLIU (loopback), using opti-
cal fiber cable. Refer to Figure 5-1.
NOTE
:
The optical fiber cable required are listed under "Tools, Test Sets, and
Accessories".
4. During the loopback test the far-end communications must be disabled.
Issue the command
set-fecom
and set the
address=dcc-all
and
communications=disabled
(far-end communications).
5. After a few moments, check that no alarms are present (that is, no FAULT
LED lighted on any circuit packs). If alarms are present, press the UPD/
INIT pushbutton on the SYSCTL. If alarms do not clear, refer to the "Trou-
bleshooting" section of this manual.
NOTE
:
If BBG6 (STS-1E) circuit packs are present ‘INC. EC-1 LOS’ alarms will
exist until EC-1 loopback connections are made as the BBG6 transmits an
internal test signal at all times. When EC-1 loopbacks are present, ‘INC.
STS AIS’ alarms may exist at the far-end for low speed applications utiliz-
ing VT cross-connects.
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