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