XRT75R12_07 EXAR [Exar Corporation], XRT75R12_07 Datasheet

XRT75R12_07

Manufacturer Part Number

XRT75R12_07

Description

TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER

Manufacturer

EXAR [Exar Corporation]

Datasheet

1.XRT75R12_07.pdf (90 pages)

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JUNE 2007

GENERAL DESCRIPTION

The XRT75R12 is a twelve channel fully integrated

Line Interface Unit (LIU) featuring EXAR’s R

Technology (Reconfigurable, Relayless Redundancy)

for E3/DS3/STS-1 applications. The LIU incorporates

12 independent Receivers, Transmitters and Jitter

Attenuators in a single 420 Lead TBGA package.

Each

independently configured to operate in 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 XRT75R12’s differential receiver provides high

noise interference margin and is able to receive data

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

attenuation.

The XRT75R12 incorporates an advanced crystal-

less jitter attenuator per channel that can be selected

either in the transmit or receive path. The jitter

Exar

IGURE

Corporation 48720 Kato Road, Fremont CA, 94538

1. B

channel

Pmode

RESET

XRT75R12IB

RRing_n

TRing_n

ART

MRing_n

Addr[7:0]

RTIP_n

TTIP_n

ICT

MTIP_n

DMO_n

LOCK

PCLK

D[7:0]

RDY

INT

UMBER

IAGRAM OF THE

TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER

the

LoopBack

Local

µProcessor Interface

Monitor

Device

Equalizer

Driver

AGC/

Line

XRT75R12

Peak Detector

XRT 75R12

Shaping

ORDERING INFORMATION

Control

Pulse

Slicer

can

Detector

LOS

Clock & Data

420 Lead TBGA

Control

Timing

Recovery

XRT75R12

•

ACKAGE

Channel 0

(510) 668-7000

Channel n...

attenuator performance meets the ETSI TBR-24 and

Bellcore GR-499 specifications.

The XRT75R12 provides a Parallel Microprocessor

Interface for programming and control.

The XRT75R12 supports analog, 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.

APPLICATIONS

•

Channel 11

Attenuator

E3/DS3 Access Equipment

DSLAMs

Digital Cross Connect Systems

CSU/DSU Equipment

Routers

Fiber Optic Terminals

Synthesizer

Attenuator

Jitter

Clock

Jitter

•

LoopBack

Remote

FAX (510) 668-7017

MUX

Encoder

Decoder

HDB3/

B3ZS

HDB3/

B3ZS

PERATING

XRT75R12

-40

•

www.exar.com

EMPERATURE

C to +85

RxNEG/LCV_n

CLKOUT_n

RLOL_n

SFM_en

DS3Clk

E3Clk

STS-Clk/12M

TxClk_n

TxPOS_n

TxNEG_n

RxClk_n

RLOS_n

RxPOS_n

TxON

REV. 1.0.3

ANGE

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