GENERAL DESCRIPTION

The DS2149 is a fully integrated LIU for long haul or short-haul T1 applications over twisted

pair installations. It interfaces to two twisted-pair linesóone pair for transmit and one pair for

receive through an appropriate network interface. The device can be configured for control through software or hardware mode. Software control is accomplished over a serial port, in hardware mode; individual pin settings allow standalone operation. The device provides a precise, crystal-less jitter attenuator that can be placed in either the transmit or receive path.

FEATURES


Fully Integrated Line Interface Unit (LIU)


Pin Compatible with LevelOne LXT362


Supports Both Long Haul and Short Haul


Crystal-Less Jitter Attenuator


Jitter Attenuator Programmable for Transmit or Receive Path


Meets ANSI T1.102, T1.403, T1.408, and AT&T 62411


Usable Receive Sensitivity of 0dB to -36dB That Allows the Device to Operate on 0.63mm (22AWG) Cables Up to 6k Feet in Length


Five Line Build-Out Settings for Short-Haul Applications


Four CSU Filters from 0dB to -22.5dB


Transmit/Receive Performance Monitors with Driver-Fail, Monitor-Open, and Loss of-Signal Outputs


Bipolar or NRZ Interface


Programmable B8ZS Encoder/Decoder


QRSS Generator/Detector


Local, Remote, and Analog Loopbacks


Generates and Detects In-Band Loop-Up and Loop-Down Codes


Serial Interface Provides Access to Control Registers

APPLICATIONS

Routers

Data Service Units (DSUs)

Channel Service Units (CSUs)

Muxes

Switches

Channel Banks

T1/E1 Test Equipment