Lucent Technologies DDM-2000 OC-3, User & Service Manual

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363-206-285
Shelf Descriptions and Configurations
3-8 Issue 3 June 2001
DDM-2000 OC-3 Shelf Capacity 3
The DDM-2000 OC-3 Multiplexer provides multiplexing and transport for up to three
STS-1 signals in a terminal, add/drop, or ring configuration. In a ring configuration,
the drop capacity of 3 STS-1s may be utilized in any combination of low-speed
inputs as follows:
■
84 DS1s
■
56 DS1s and 1 DS3 (or EC-1 or OC-1 or 2 partially filled OC-1s)
■
28 DS1s and 2 DS3s (or EC-1s or up to 4 partially filled OC-1s)
■
3 DS3s (or EC-1s or up to 6 partially filled OC-1s)
■
3 (partially filled) OC-3s
■
6 single-homed or 12 dual-homed OC-1 extensions or a mix with other
services not to exceed the OC-3 shelf capacity.
In a linear add/drop configuration, this capacity may be utilized in any combination
of low-speed inputs as follows:
■
56 DS1s
■
28 DS1s and 1 DS3 (or EC-1)
■
2 DS3s (or EC-1s)
■
2 OC-3s.
System growth proceeds in a modular fashion. Capacity can grow in increments of
4 DS1 signals, up to 28 DS1s per STS-1. The DDM-2000 OC-3 Multiplexer can also
provide transport of a single STS-3c signal from one OC-3 interface to another.
In many instances, the OC-3 capacity may be sufficient for many years of growth.
Should network needs grow beyond the OC-3 capacity, the facility can be upgraded
while in service to the OC-12 capacity using the 24G-U OLIUs.