5V T1/J1 Line Interface Unit

Complete 5V, T1 Line Interface Unit (LIU) for Short-Haul and Long-Haul Applications
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This product is Not Recommended for New Designs. Some versions may be No Longer Available or being discontinued and subject to Last Time Buy, after which new orders can not be placed.


The DS2149 is a complete T1 line interface unit (LIU) for short-haul and long-haul applications. Receive sensitivity adjusts automatically to the incoming signal and can be limited to -18dB, -26dB, or -36dB. The device can generate the necessary DSX-1 line build-outs or CSU line build-outs of 0dB, -7.5dB, -15dB, and -22.5dB. The on-board crystal-less jitter attenuator requires a 1.544MHz reference clock. The jitter attenuator FIFO is selectable to either 32 bits or 128 bits in depth and can be placed in either the transmit or receive data paths. The DS2149 has diagnostic capabilities such as loopbacks and QRSS pattern generation and detection. The device can also generate and detect the in-band loop-up and loop-down codes specified in AT&T 62411. The device can be configured for control using a serial interface, or for hardware mode. The device fully meets all of the latest T1 specifications including ANSI T1.102-1999, ANSI T1.403-1999, ANSI T1.408, and AT&T 62411.

Data Sheet

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Key Features

  • Fully integrated line interface unit (LIU)
  • Pin compatible with 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, AT&T 62411
  • Usable receive sensitivity of 0dB to -36dB, which 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


  • Channel Banks
  • Channel Service Units (CSUs)
  • Data Service Units (DSUs)
  • Muxes
  • Routers/Switches
  • Routers/Switches
  • T1/E1 Test Equipment


DS2149: Block Diagram
Block Diagram

More Information

New Product Press Release   2002-04-24 ]

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Rev 2; 2004-12-01
This page last modified: 2009-10-14