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ADCP-80-353 • Issue 2 • August 2002 • Section 1: Description
2 FEATURES AND BENEFITS
2.1
Modularity
The DSX-3 (DSX-4U-24) Rear Cross-Connect System is modular for easy expansion at the
user's site, and may provide any number of bi-directional cross-connects in multiples of 120 (up
to 240 equipment terminations) per 2.13 meter (7 foot) bay. This allows for installation of a
minimal system configuration to meet the immediate needs of a site, and then expanding it as
necessary by adding individual DSX-4U circuit modules. Each cross-connect system consists of
up to 240 DSX-4U circuit modules (two per cross-connect) plugged into a 2.13 m × 48.26 cm ×
30.48 cm (7 foot × 19 inch × 12 inch) equipment bay.
2.2
Connectors
The DSX-3 (DSX-4U-24) Rear Cross-Connect System has BNC connectors for terminating
coaxial cross-connect (XO and XI) and equipment IN/OUT (O and I) cabling, and pin jacks for
interconnecting of tracer lamps. Patching and monitoring is accomplished by means of standard
or midsize coaxial jacks located on the front of the module.
2.3
Tracer Lamps
A red flashing light emitting diode (LED) tracer lamp is located at the top of each DSX-4U
circuit module for quick and easy identification of cross-connected circuits.
2.4
Cable Management
Unequal flange (duct type) racks and spacers provide space for routing office/equipment cables
to and from the various shelves in the cross-connect system bay. Cable brackets are provided on
each side at the rear for fastening of the cables to the bay. Vertical and horizontal rings are
provided at the rear of the bay for orderly routing of cross-connect cables between circuit
modules on the bay, and cable troughs at the top and bottom allow for orderly cross-connect
cabling between bays.
Note: ADC recommends spacing of 25.4 cm (10.0 inches) between bays to avoid the
possibility of cable congestion.
3 FUNCTIONAL DESCRIPTION
The DSX-3 (DSX-4U-24) Rear Cross-Connect System consists of up to 240 individual DSX-
4U circuit modules, two of which are shown schematically in
accommodates the input and output of one digital equipment unit, and two circuit modules are
required for each cross-connect.
Page 1-2
© 2002, ADC Telecommunications, Inc.
Figure
1-1. Each circuit module
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