Datasheet > PE-68629

PE-68629

更新时间： 2024-11-25 22:44:31

品牌	Logo	应用领域
艾科嘉 - EXAR		变压器
页数	文件大小	规格书
55页	574K
描述
E3/DS3/STS-1 LINE INTERFACE UNIT

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数据手册

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PE-68629 数据手册

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XRT7300

E3/DS3/STS-1 LINE INTERFACE UNIT

FEBRUARY 2002

REV. 1.1.1

FEATURES

GENERAL DESCRIPTION

• Meets E3/DS3/STS-1 Jitter Tolerance Require-

ments

The XRT7300 DS3/E3/STS-1 Line Interface Unit is

designed to be used in DS3, E3 or SONET STS-1 ap-

plications and consists of a line transmitter and re-

ceiver integrated on a single chip.

• Full Loop-Back Capability

• Transmit and Receive Power Down Modes

• Full Redundancy Support

XRT7300 can be configured to support the E3

(34.368 Mbps), DS3 (44.736 Mbps) or the SONET

STS-1 (51.84 Mbps) rates.

• Contains a 4-Wire Microprocessor Serial Interface

• Uses Minimum External components

• Requires Single +5V Power Supply

• -40°C to +85°C Operating Temperature Range

• Available in a 44 pin TQFP package

In the transmit direction, the XRT7300 encodes input

data to either B3ZS (for DS3/STS-1 applications) or

HDB3 (for E3 applications) format and converts the

data into the appropriate pulse shapes for transmis-

sion over coaxial cable via a 1:1 transformer.

APPLICATIONS

In the receive direction the XRT7300 performs equal-

ization on incoming signals, performs Clock Recov-

ery, decodes data from either B3ZS or HDB3 format,

converts the receive data into TTL/CMOS format,

checks for LOS or LOL conditions and detects and

declares the occurrence of line code violations.

• Interfaces to E3, DS3 or SONET STS-1 Networks

• CSU/DSU Equipment

• PCM Test Equipment

• Fiber Optic Terminals

• Multiplexers

The XRT7300 also contains a 4-Wire Microprocessor

Serial Interface for accessing the on-chip Command

registers.

NOTE: This Device is Protected by US Patent # 6,157,270

FIGURE 1. BLOCK DIAGRAM OF THE XRT7300

STS-1/DS3

Host/(HW)

RLOL EXCLK

ICT

RCLK2INV

RTIP

RCLK1

AGC/

Equalizer

Clock

Recovery

Slicer

Invert

RRING

LCV/(RCLK2)

Peak

Detector

REQDIS

Data

Recovery

RPOS

RNEG

HDB3/

B3ZS

Decoder

LOS Detector

LOSTHR

SDI

DECODIS

RLOS

SDO/(LCV)

SClk

Serial

Processor

Interface

LLB

Loop MUX

RLB

ENCODIS

TAOS

REGRESET

TPDATA

TNDATA

TClk

TTIP

HDB3/

B3ZS

Encoder

Transmit

Logic

Pulse

Shaping

Duty Cycle Adjust

TRING

TXLEV

TXOFF

Control

MTIP

MRING

DMO

Device

Monitor

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

12 3 4 5 6 7...55

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