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