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COMSPHERE 3000 Series Carrier
1-2 December 1994 3000-A2-GA31-80
Figure 1-1. COMSPHERE 3000 Series Carrier
An optional fan module for the ac carriers is available
to provide forced air cooling to dissipate heat generated
within the carrier. It is recommended that fully configured
carriers and cabinets be installed with fan modules to
extend the life of the equipment. Guidelines for fan
module provisions are listed in Table 3-1 of the Fan
Module Installation section in Chapter 3.
An SDCP is required for initial installation and for
testing of 3600 Series DSUs, 3151 T1 CSUs, and 3161 T1
DSU/CSUs and their options. Models 3811 and 3911
dial/lease modems can be installed using the SDCP or AT
commands from the attached DTE. The SDCP, in
conjunction with the SDU, allows up to eight
COMSPHERE 3000 Series Carriers to be managed from
one control panel. Models 3551, 3611, and 3616 DSUs
and Models 3811 and 3911 dial/lease modems are
managed by either the COMSPHERE 6700 or 6800 Series
Network Management System (NMS).
Within the carrier, the first slot (Slot 0) is reserved for
the SDU. The SDU provides the required interface that
daisy chains carriers together for NMS and/or SDCP
control. In a cabinet configuration, connectivity between
the DSUs in the individual carriers allows control of
compatible units in the cabinet through a single NMS
interface, a single SDCP, or both.
On the rear of the carrier is a pair of 50-pin connectors
(P21 and P22) that provide the following network
interfaces:
• Digital line interface for DSUs.
• Analog leased-line interface for dial/lease modems.