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COMSPHERE 3000 Series Carrier
3-2 December 1994 3000-A2-GA31-80
Overview
A COMSPHERE 72-inch cabinet is available for
mounting the COMSPHERE 3000 Series Carriers. Up to
six carriers can be mounted into a single cabinet. The
COMSPHERE 3000 Series Carriers can also be mounted
into other commercial EIA standard 19-inch and 23-inch
cabinets.
The COMSPHERE 3000 Series Carrier, Figure 3-1, is
designed to house T1 CSUs, T1 DSU/CSUs, DSUs,
DBM-Vs, DBM-Ss, DBM-Ds, TDMs, MCMPs, and
dial/lease modems. The carrier is a metal enclosure that
contains slots for installation of 17 circuit cards. The slot
labeled SDU (Slot 0) is reserved for the Shared Diagnostic
Unit (SDU); Slots 1 through 16 are for T1 CSUs, T1
DSU/CSUs, DSUs, DBM-Vs, DBM-Ss, DBM-Ds, TDMs,
MCMPs, or dial/lease modems. Under each slot number
(on the cover plate or SDCP) is a small area in which to
write the circuit channel identification numbers.
The carrier’s backplane contains connectors which
automatically engage mating connectors on the devices as
they are being installed. Filler panels (which must be
ordered separately) are required for unfilled slots.
Two 50-pin connectors (P21 and P22) at the rear of the
carrier (each serving eight carrier slots) provide an
interface between the carrier and the digital line for DSUs
and the carrier and the leased line for dial/lease modems.
Above these are connectors for the dial network
connections (P23 and P26). One or two network interface
modules (each serving eight carrier slots) can be ordered,
as needed, to establish dial network connections.
Figure 3-1. COMSPHERE 3000 Series Carrier Assembly