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