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Technical Reference: DSX-3 Technical Reference Guide

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Attached Document Summary
A digital signal cross-connect (DSX) is a central terminal for digital equipment at a particular digi- tal signal bit rate, providing both permanent and temporary connections. DSX test ports provide bridged and series access for test or patching.
A DSX-3 is a high-density device for cross-connecting the DS3, STS-1, STS-3, and E3 signal types from broadband equipment, such as digital radio, fiber-optic multiplexers, and 3:3 or 3:1 DCS.
This document also describes:
  • Digital Signal (DS)—One of several transmission rates in the time-division multiplex hierarchy.
  • DS3 (T3)—The digital signal rate of 44.736 Mbps (45 MBps, generically), accommodating 672 voice channels (28 T1s). This is the signal rate handled by DSX-3 equipment.
  • DS Equipment—System/network elements, not including DSX-3 panels.
  • DSX-3 Panel—The individual cross-connect panel or shelf equipment, installed in a bay or mounted on a wall.
  • DSX-3 Bay—The individual rack structure that contains DSX-3 panels, associated communication panels, terminal strips, blocks, and test and maintenance equipment required for DSX-3 frame support. Cable and wire management are included with the bays.
  • DSX-3 Frame—A generic term for one or more DSX-3 bays equipped with all necessary equipment to perform all DSX-3 functions.
  • DSX-3 Network—Includes one or more interlinked DSX frames, at a single location, that perform all DSX-3 functions in common. A single bay could comprise the entire network.
  • DSX-3 System—A DSX-3 network that includes all operating equipment terminated at the DSX- 3 frames, cabling, support services, planning, engineering records, assignment, and operations support.
  • Digital Multiplexers (MUX)—Equipment that interfaces different bit rates to a single transmit path in the digital network. Multiplexing combines individual channels into common bit streams. De-multiplexing separates the channels out again.
  • Tie Frames—Provide electrical access and connection points between physically separated DSX-3 frames within an office environment.
  • Span—A digital line between two offices or between an office and a remote site, run through repeater equipment.
  • Distributing Frame—Interconnection points that provide telecommunications services to customers. Distributing frames provide termination for facilities and equipment, cross-connection, support for electrical protection devices, and test access.
  • Decibel (dB)—A unit of measure that expresses the ratio of two voltages, currents, or powers. The dB specifies transmission loss, gain, or relative level of the digital signal.
  • Relay Rack—A generic term for the mounting structure that contains telecommunications operating equipment. The relay rack is the base structure for the physical DSX-3 frame.
  • Churn—A common term for connection, disconnection, and rearrangement activities at a DSX-3 frame.
  • Roll—Move an in-service circuit to another termination with minimal effect to signal transmission.
  • Tracer—An LED, usually called a “lamp,” that gives the user a visual indication of a successful cross-connect (completed circuit). The terms tracer, lamp, and LED, in connection with this function, are used interchangeably in this reference guide.
  • Line-up—A frame of bays, side-by-side, in a straight line.
  • Jumper—Cross-connect wire.
  • STS—Sonet transport signal.
  • STM—Synchronous transport mode.
Attached document Part No.: 
119178 A0.1
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