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

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4-10 Issue 9 October 1998
363-206-204
Powering, Verification, and Circuit Pack Installation
BBF1B (DS1) and BBF3 (DS1PM) Circuit Packs
The BBF1B and BBF3 (DS1PM) circuit packs requires that the function unit slots
in the same function group be equipped with BBG2 (MXRVO) or BBG6 (EC-1)
circuit packs set to high speed option.
The BBF1B (DS1) and BBF3 (DS1PM) circuit packs has one option switch for
assigning the following:
■
Line build out (distance to DSX)
■
DS1 line code [alternate mark inversion (AMI) or bipolar with eight zero
substitution (B8ZS)].
■
Switch 1, Section 8, must be set to OFF for the BBF3.
NOTE
:
When a BBF3 circuit pack is used anywhere within a low speed group and
DS1 protection is desired, the DS1 circuit pack occupying the protection
slot of that group must be a BBF3.
NOTE
:
Each DS1 channel’s line code can be individually set. In the absence of
DS1 line coding information, coding should be set for AMI.
1. Set the DS1 circuit pack option switch as required. Refer to Figure 4-12.
2. Place, but do not fully install, the DS1 circuit pack(s) into the shelf.
NOTE
:
If the function group is equipped for low speed protection, a 177A retainer
MUST be inserted in all vacant low speed service slots in a partially
equipped function group.
3. If 177As are required, place but do not fully install, the 177As into the shelf.
BBF2/BBF2B (TGS) Circuit Packs
The BBF2 circuit pack has one option switch for assigning the following:
■
DS1 line code (AMI or B8ZS)
■
Frame format (superframe or extended superframe)
■
Timing format (external, free running, or loop-timed).
1. Set the BBF2 circuit pack option switch per office timing source as shown in
Figure 4-13.
2. Place, but do not fully install, the BBF2 circuit packs into the shelf.
The BBF2B circuit pack has two option switches for assigning the following: