xrt75l04d Exar Corporation, xrt75l04d Datasheet

xrt75l04d

Manufacturer Part Number

xrt75l04d

Description

Xrt75l04d -four-channel Ds3/e3/sts-1 Line Interface Unit With Sonet Desynchronizer

Manufacturer

Exar Corporation

Datasheet

1.XRT75L04D.pdf (98 pages)

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NOVEMBER 2003

GENERAL DESCRIPTION

The XRT75L04D is a four-channel fully integrated

Line Interface Unit (LIU) with Sonet Desynchronizer

for E3/DS3/STS-1 applications. It incorporates four

independent Receivers,

Attenuators in a single 176 pin QFP package.

Each channel of the XRT75L04D can be configured

to operate in E3 (34.368 MHz), DS3 (44.736 MHz) or

STS-1 (51.84 MHz) rates that are independent of

each other. Each transmitter can be turned off and tri-

stated for redundancy support and for conserving

power.

The XRT75L04D’s differential receivers provide high

noise interference margin and are able to receive the

data over 1000 feet of cable or with up to 12 dB of

cable attenuation.

The XRT75L04D 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

Telcordia GR-499, GR-253 specifications. Also, the

jitter attenuator can be used for clock smoothing in

SONET STS-1 to DS3 de-mapping.

The XRT75L04D provides both Serial Microprocessor

Interface as well as Hardware mode for programming

and control.

The XRT75L04D supports local, remote and digital

loop-backs. The XRT75L04D also contains an on-

board Pseudo Random Binary Sequence (PRBS)

generator and detector with the ability to insert and

detect single bit error.

FEATURES

RECEIVER:

Exar

On chip Clock and Data Recovery circuit for high

input jitter tolerance.

Meets the jitter tolerance requirements as specified

in ITU-T G.823_1993 for E3 and Telcordia GR-499-

CORE for DS3 applications.

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

either be enabled or disabled.

On-chip

appropriate rate clock from a single frequency

XTAL.

FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

Corporation 48720 Kato Road, Fremont CA, 94538

clock

synthesizer

Transmitters

generates

and Jitter

the

•

(510) 668-7000

TRANSMITTER:

JITTER ATTENUATOR:

CONTROL AND DIAGNOSTICS:

APPLICATIONS

Provides low jitter clock outputs for either DS3,E3

or STS-1 rates.

Compliant with Telcordia GR-499, GR-253 and

ANSI T1.102 Specification for transmit pulse

Tri-state Transmit output capability for redundancy

applications

Transmitters can be turned on or off.

On chip advanced crystal-less Jitter Attenuator.

Jitter Attenuators can be selected in Receive or

Transmit paths.

Compliant with jitter transfer template outlined in

ITU G.751, G.752, G.755, GR-253 and GR-499-

CORE,1995 standards.

Meets ETSI TBR 24 Jitter Transfer Requirements.

16 ,32 or 128 bits selectable FIFO size.

Meets the Wander specifications described in

T1.105.03b.

Jitter Attenuators can be disabled.

Serial Microprocessor Interface for control and

configuration.

Supports

Monitoring.

PRBS error counter register to accumulate errors.

Supports Local, Remote and Digital Loop-backs.

Single 3.3 V ± 5% power supply.

5 V Tolerant I/O.

Maximum Power Dissipation 1.8W.

Available in 176 pin QFP package

- 40°C to 85°C Industrial Temperature Range.

E3/DS3 Access Equipment.

STS1-SPE to DS3 Mapper.

DSLAMs.

Digital Cross Connect Systems.

CSU/DSU Equipment.

Routers.

•

FAX (510) 668-7017

optional

XRT75L04D

internal

•

www.exar.com

Transmit

REV. 1.0.1

Driver

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