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COMSPHERE 3600 Series Data Service Units
3-2 March 1999 3610-A2-GB41-60
Non-Modular DSU with a TDM or MCMP
The non-modular Model 3611 DSU-TDM or
DSU-MCMP has connectors mounted directly onto the
circuit cards. With this type of unit, the DTE cables must
be disconnected before the unit can be removed from the
carrier.
A 60-pin high-density connector is mounted onto the
TDM or MCMP circuit card. This connector requires
either a TDM Interface Cable (feature number
3600-F2-500, part number 035-0101-0631) or a Digital
Bridge Interface Cable (feature number 3600-F2-501, part
number 035-0102-0631), depending upon the application.
These cables must be ordered separately.
These cables provide fan-out cabling to five individual
EIA-232 25-pin connectors. Each cable is six feet long
and connected to the unit’s dedicated DBM-Vs, DBM-Ss,
or DBM-Ds. The fan-out section is one foot long.
Appendix C shows each cable and its pin assignments,
as well as the TDM’s or MCMP’s 60-pin high-density
connector. To order cables, refer to Equipment Lists,
Appendix L, of the COMSPHERE 3600 Series Data
Service Units, Models 3610 and 3611, Operator’s Guide.
Modular DSU with a TDM or MCMP
The modular DSU-TDM or DSU-MCMP has “gold
finger” contacts for connectors, which plug into a 6-port
connector module (delivered with the unit) that is
mounted onto the rear of the carrier. With this type of unit,
the DTE cables do not have to be disconnected before
removing the unit from the carrier.
Each port on the 6-port connector module is a 25-pin
connector that provides the EIA-232 DTE interface. All
port connectors are individual with this type of unit, and a
separate crossover cable is required for each connector
that is attached to a DBM-V, DBM-S, or DBM-D.
In addition to the six ports on the 6-port connector
module, a 26-pin high-density D-type connector is located
at the top of the connector module to provide a V.35
interface for either Port 1 or an aggregate data path. To
use the V.35 interface, the 6-port V.35 Interconnect Cable
(feature number 3600-F3-500, part number
035-0174-0031) is required. The cable provides an
interface between the high-density D-type connector and a
DTE cable’s V.35 connector.
Appendix C shows the 6-port connector module and
provides the port pin assignments. Cables must be ordered
separately.
DBM-Vs/DBM-Ss/DBM-Ds
DBM-Vs, DBM-Ss, and DBM-Ds are dial backup units
that are used for multipoint dial backup. Each DBM-V,
DBM-S, or DBM-D occupies a slot in the COMSPHERE
3000 Series Carrier, and is connected to a TDM or MCMP
circuit card through cables. Up to five DBM-Vs, DBM-Ss,
or DBM-Ds can be connected to a DSU-TDM or
DSU-MCMP. The TDM or MCMP option is configured to
operate as a digital bridge; the digital bridge and its
DBMs are dedicated to a single DSU within the carrier.
Typical configurations for various applications can be
found in the Digital Bridge/DBM-V/DBM-S/DBM-D
Interface section of Chapter 4. Various configurations for
digital bridge and DBM-V, DBM-S, and DBM-D
applications are shown in Appendix D. Installation
procedures for connecting DBMs are included in the
Adding the TDM or MCMP Option to an Installed Model
3611 DSU section in this chapter.