GENERAL DESCRIPTION

The XRT75L03 is a three-channel fully integrated Line Interface Unit (LIU) with Jitter Attenuator for E3/DS3/STS-1 applications. It incorporates 3 independent Receivers, Transmitters and Jitter Attenuators in a single 128 pin LQFP package.

FEATURES

RECEIVER:

? On chip Clock and Data Recovery circuit for high input jitter tolerance

? Meets E3/DS3/STS-1 Jitter Tolerance Requirement

? Detects and Clears LOS as per G.775

? Receiver Monitor mode handles up to 20 dB flat loss with 6 dB cable attenuation

? On chip B3ZS/HDB3 encoder and decoder that can be either enabled or disabled

? On-chip clock synthesizer provides the appropriate rate clock from a single 12.288 MHz Clock

? Provides low jitter output clock

TRANSMITTER:

? Compliant with Bellcore GR-499, GR-253 and ANSI T1.102 Specification for transmit pulse

? Tri-state Transmit output capability for redundancy applications

? Each Transmitter can be turned on or off

? Transmitters provide Current Output Drive

JITTER ATTENUATOR:

? On chip advanced crystal-less Jitter Attenuator for each channel

? Jitter Attenuator can be selected in Receive or Transmit paths

? Meets ETSI TBR 24 Jitter Transfer Requirements

? Compliant with jitter transfer template outlined in ITU G.751, G.752, G.755 and GR-499-CORE,1995 standards

? 16 or 32 bits selectable FIFO size

? Jitter Attenuator can be disabled

CONTROL AND DIAGNOSTICS:

? 5 wire Serial Microprocessor Interface for control and configuration

? Supports optional internal Transmit driver monitoring

? Hardware Mode for control and configuration

? Each channel supports Local, Remote and Digital Loop-backs

? Single 3.3 V ± 5 power supply

? 5 V Tolerant digital inputs

? Available in 128 pin LQFP Package

? - 40°C to 85°C Industrial Temperature Range

APPLICATIONS

? E3/DS3 Access Equipment

? DSLAMs

? Digital Cross Connect Systems

? CSU/DSU Equipment

? Routers

? Fiber Optic Terminals