XRT75L03D Datasheet, PDF (1/134 Pages) Exar Corporation – THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

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XRT75L03D
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
JUNE 2003
GENERAL DESCRIPTION
The XRT75L03D 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.
Each channel of the XRT75L03D 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 XRT75L03D’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 XRT75L03D 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 XRT75L03D provides both Serial Microprocessor
Interface as well as Hardware mode for programming
and control.
The XRT75L03D 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
TRANSMITTER:
REV. 1.0.0
• 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 Drive Output
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
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
• 5 V Tolerant I/O
• Available in 128 pin Thermally enhanced LQFP
Package
• - 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
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com