DS21349

NOT RECOMMENDED FOR NEW DESIGNS

3.3V T1/J1 Line Interface Unit

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • 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 buildout 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

The DS21349 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

  • Channel Banks
  • Channel Service Units (CSUs)
  • Data Service Units (DSUs)
  • Muxes
  • Routers/Switches
  • Routers/Switches
  • T1/E1 Test Equipment
DS21349
3.3V T1/J1 Line Interface Unit
DS21349: Block Diagram
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 2

Technical Articles 1

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Hardware Ecosystem

Parts Product Life Cycle Description
Interface Transceivers 5
DS2149
NOT RECOMMENDED FOR NEW DESIGNS 5V T1/J1 Line Interface Unit
DS21348
NOT RECOMMENDED FOR NEW DESIGNS 3.3V E1/T1/J1 Line Interface
DS2148
NOT RECOMMENDED FOR NEW DESIGNS 5V E1/T1/J1 Line Interface
DS21Q48
Obsolete 5V E1/T1/J1 Line Interface
DS21Q348
3.3V E1/T1/J1 Line Interface
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Evaluation Kits

DS2149DK

T1/J1 Line Interface Unit Design Kit

Buy Now View Details

Features and Benefits

  • PLCC 28-pin socket for multiple part evaluation
  • Bantam and RJ48 connectors, transformers, and termination passives for LIU
  • Two separate and controllable transmit paths for TTIP and TRING for evaluating multiple transformers
  • Equipment-side connector for external data source/sink or external remote loopback
  • On-board T1 crystal oscillator
  • On-board 8051 microprocessor for software mode access
  • Connector accesses to CS, SCLK, SDI, and SDO for firmware development
  • Controllable 5V and 3.3V for VCC and IO pins to support the DS2149 and DS21349 LIUs

Product Details

The DS2149DK/DS21349DK is a fully integrated design kit for the DS2149 and the DS21349 T1/J1 line interface units (LIUs). It contains the necessary circuitry to evaluate the device in all operation modes, including running the device in hardware and software mode.

DS21349DK

T1/J1 Line Interface Unit Design Kit

Buy Now View Details

Features and Benefits

  • PLCC 28-pin socket for multiple part evaluation
  • Bantam and RJ48 connectors, transformers, and termination passives for LIU
  • Two separate and controllable transmit paths for TTIP and TRING for evaluating multiple transformers
  • Equipment-side connector for external data source/sink or external remote loopback
  • On-board T1 crystal oscillator
  • On-board 8051 microprocessor for software mode access
  • Connector accesses to CS, SCLK, SDI, and SDO for firmware development
  • Controllable 5V and 3.3V for VCC and IO pins to support the DS2149 and DS21349 LIUs

Product Details

The DS2149DK/DS21349DK is a fully integrated design kit for the DS2149 and the DS21349 T1/J1 line interface units (LIUs). It contains the necessary circuitry to evaluate the device in all operation modes, including running the device in hardware and software mode.
DS2149DK
T1/J1 Line Interface Unit Design Kit
DS21349DK
T1/J1 Line Interface Unit Design Kit

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