DS2149

NOT RECOMMENDED FOR NEW DESIGNS

5V T1/J1 Line Interface Unit

Complete 5V, T1 Line Interface Unit (LIU) for Short-Haul and Long-Haul Applications

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • 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

    • 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.

    Applications

    • Channel Banks
    • Channel Service Units (CSUs)
    • Data Service Units (DSUs)
    • Muxes
    • Routers/Switches
    • Routers/Switches
    • T1/E1 Test Equipment
    DS2149
    5V T1/J1 Line Interface Unit
    DS2149: Block Diagram
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    Documentation

    Data Sheet 1

    Reliability Data 1

    Application Note 2

    Design Note 1

    Technical Articles 1

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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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