GENERAL DESCRIPTION
The XRT75L00D is a single-channel fully integrated Line Interface Unit (LIU) with Sonet Desynchronizer for E3/DS3/STS-1 applications. It incorporates an independent Receiver, Transmitter and Jitter Attenuator in a single 52 pin TQFP package.

FEATURES
RECEIVER:
• On chip Clock and Data Recovery circuit for high input jitter tolerance.
• Meets E3/DS3/STS-1 Jitter Tolerance Requirements.
• Detects and Clears LOS as per G.775.
• Meets Bellcore GR-499 CORE Jitter Transfer Requirements.
• Receiver Monitor mode handles up to 20 dB flat loss with 6 dB cable attenuation.
• Compliant with jitter transfer template outlined in ITU G.751, G.752, G.755 and GR-499-CORE,1995 standards.
• Meets ETSI TBR 24 Jitter Transfer Requirements.
• 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
• Transmitter can be turned on or off.

JITTER ATTENUATOR:
• On chip advanced crystal-less Jitter Attenuator.
• Jitter Attenuator can be selected in Receive or Transmit paths.
• 16, 32 or 128 bits selectable FIFO size.
• Meets the Jitter and Wander specifications described in T1.105.03b,ETSI TBR-24, Bellcore GR-253 and GR-499 standards.
• Jitter Attenuator can be disabled.
• De-Synchronizer for SONET STS-1 to DS-3 demapping.

CONTROL AND DIAGNOSTICS:
• 5 wire Serial Microprocessor Interface for control and configuration.
• Supports optional internal Transmit Driver Monitoring.
• PRBS error counter register to accumulate errors.
• Hardware Mode for control and configuration.
• Supports Local, Remote and Digital Loop-backs.
• Single 3.3 V ± 5% power supply.
• 5 V Tolerant I/O.
• Available in 52 pin TQFP.
• -40°C to 85°C Industrial Temperature Range.

APPLICATIONS
• E3/DS3 Access Equipment.
• DSLAMs.
• Digital Cross Connect Systems.
• CSU/DSU Equipment.
• Routers.