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REV: 113004

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

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

lines—one 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.

APPLICATIONS

Routers

Data Service Units (DSUs)

Channel Service Units (CSUs)

Muxes

Switches

Channel Banks

T1/E1 Test Equipment

PIN CONFIGURATION

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

ORDERING INFORMATION

PART

TEMP RANGE

PIN-PACKAGE

DS2149Q

0°C to +70°C

28 PLCC

DS2149QN

-40°C to +85°C

28 PLCC

5

6

7

8

9

10

11

25

24

23

22

21

20

19

12 13 14 15 16 17 18

4 3 2 1 28 27 26

DS2149

TOP VIEW

PLCC

www.maxim-ic.com

DS2149

5V T1/J1 Line Interface Unit

DEMO KIT AVAILABLE