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XRT75R03DIV Datasheet(PDF) 1 Page - Exar Corporation |
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XRT75R03DIV Datasheet(HTML) 1 Page - Exar Corporation |
1 / 134 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XRT75R03D THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER DECEMBER 2003 REV. 1.0.2 GENERAL DESCRIPTION The XRT75R03D is a three-channel fully integrated Line Interface Unit (LIU) featuring EXAR’s R3 Technology (Reconfigurable, Relayless Redundancy) 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. Each channel of the XRT75R03D can be independently configured to operate in the data rate, E3 (34.368 MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz). Each transmitter can be turned off and tri- stated for redundancy support or for conserving power. The XRT75R03D’s differential receiver provides high noise interference margin and is able to receive the data over 1000 feet of cable or with up to 12 dB of cable attenuation. The XRT75R03D incorporates an advanced crystal- less jitter attenuator per channel that can be selected either in the transmit or receive path. The jitter attenuator performance meets the ETSI TBR-24 and Bellcore GR-499 specifications. The XRT75R03D provides both Serial Microprocessor Interface as well as Hardware mode for programming and control. The XRT75R03D supports local, remote and digital loop-backs. The device also has a built-in Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error for diagnostic purposes. FEATURES RECEIVER: • R3 Technology (Reconfigurable, Relayless Redundancy) • 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: • R3 Technology (Reconfigurable, Relayless Redundancy) • 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 independently turned on or off • Transmitters provide Voltage 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 • 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 I/O • Available in 128 pin LQFP • - 40°C to 85°C Industrial Temperature Range APPLICATIONS • E3/DS3 Access Equipment • STS1-SPE to DS3 De-Synchronizing • DSLAMs • Digital Cross Connect Systems • CSU/DSU Equipment • Routers • Fiber Optic Terminals |
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