MC145650 Просмотр технического описания (PDF) - Motorola => Freescale

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MC145650

Copper Gold Asymmetric Digital Subscriber Line(ADSL)Transceiver

Motorola => Freescale 

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The MC145650 is a single integrated circuit transceiver device for ANSI

(American National Standard Institute) T1.413 category 2 ADSL modems1,

based on the Discrete Multi-tone (DMT) line code. The category 2 specification

requires payload rates of (6.144 Mbps + 640 kbps) downstream and 640 kbps

upstream, with crosstalk, over carrier serving area (CSA) range loops, and to

achieve (1.544 Mbps + 176 kbps) downstream and 176 kbps upstream with

crosstalk, over selected ANSI integrated services digital network (ISDN) loops.

The payload makeup is flexible thereby allowing multiple data streams to be

multiplexed and demultiplexed.

The MC145650 is capable of data rates up to 8 Mbps downstream and 1

Mbps bi-directionally, however actual rates obtained in any system are depen-

dent on loop length, impairments, and transmitted power. The ADSL and DMT

techniques are adaptive, changing system parameters based on loop charac-

teristics in order to optimize the data rate.

This device combined with a microcontroller and a line interface may be

configured as either a central office ADSL transceiver unit (ATU-C) or as a

remote terminal ADSL transceiver unit (ATU-R).

An ADSL system could be configured to provide the user with high speed

Internet access with POTS, or two 3 Mbps MPEG2 (or four 1.5 Mbps MPEG1)

video channels, a 640 Kbps bi-directional data channel, along with POTS (Plain

Old Telephone Service), all over existing copper telephone wire.

• Designed for ANSI Standard ANS T1.413 Category 2 modems (ETSI

DTR/TM-03050)

• Single Chip Integrated Transceiver for Reduced System Cost

• Single 3.3V ±5% Power Supply

• Estimated 2 Watt Power Dissipation

• Flexible Channel Multiplexing and Demultiplexing

• Framing and Deframing

• Central Office or Remote Configurable

• Maintenance Facilities

• Initialization Control

• CRC and Scrambling

• Interleaving

• Reed-Solomon Forward Error Correction

• Wei 4D Trellis Encoding and Decoding

• DMT Modulation and Demodulation

• DMT Echo Cancellation for ADSL

• A/D Conversion and Receive Path Filtering

• D/A Conversion and Transmit Path Filtering

• Adaptive Rate Mode (N x 32 kbps Channel Programmability)

1Without 26 dBm transmit power boost

144 PIN CQFP

This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.

REV 1.4

01/97 TN97011000

© Motorola, Inc. 1997

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