Lucent Technologies DDM-2000 OC-3, Руководство по установке

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363-206-204
Release 8 Installation Tests
Issue 9 October 1998 7-11
2. Remove all the DSX cross-connect, BNC connectors or Internal loopbacks
for DS1 and DS3 service. The loopbacks for EC-1 interfaces should
remain, as the BBG6 transmits an internal signal at all times and an ‘inc.
EC-1 LOS’ alarm will result if loopbacks are removed.When EC-1 loop-
backs are present, ‘Inc. STS AIS’ alarms may exist at the far-end for low
speed applications utilizing VT cross-connects.
3. If DS1 circuit packs without loopbacks at the DSX-1 were removed to
speed up testing, reinstall them.
4. Press the UPD/INIT pushbutton on the SYSCTL.
End-To-End System Test
Description
This test verifies proper fiber optic cabling and OLIU circuit packs.
On initial installation/turn-up of a Release 8 System default cross-connects exist.
For applications as in Figure 7-3 or 7-4 the default cross-connects may have to be
deleted and reentered to fit the individual application.
An EC-1 interface composed of DS1 services should be cross-connected at the
VT level as opposed to the STS-1 level. Thus in the event of one VT (or more)
failure the channel protection switch would occur. An EC-1 interface composed of
DS3 services should be cross-connected at the STS-1 level.
Preparation
1. Verify that each shelf in the system is set for the correct timing option. Typi-
cally, a CO is set for either external or free running and the other sites are
set for loop timed.
NOTE
:
Timing selection is a switch option setting on the BBF2/BBF2B (TGS) cir-
cuit pack.
2. If the shelf is optioned for external, make sure it is connected to an external
clock through J37 on the shelf backplane; the line code and the frame
selection must be set for the attributes of the clock.
NOTE
:
In the absence of engineering records, set the line code for AMI and the
frame selection for superframe.
3. If the timing mode selection on any TGS circuit pack is changed, press the
UPD/INIT pushbutton on the SYSCTL.