GENERAL DESCRIPTION The XRT75L00 is a single-channel fully integrated Line Interface Unit (LIU) with Jitter Attenuator 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 or 32 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. 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. • Fiber Optic Terminals.
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