Transcription of DATA COMMUNICATIONS AND NETWORKING
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data COMMUNICATIONSANDNETWORKING Second Edition FM Page i Wednesday, February 23, 2000 2:30 PM FM Page ii Wednesday, February 23, 2000 2:30 PM data COMMUNICATIONSANDNETWORKING Second Edition Behrouz A. Forouzan DeAnza College with Catherine Coombs and Sophia Chung FeganBoston Burr Ridge, IL Dubuque, IA Madison, WI New York San Francisco StBangkok Bogot Caracas Lisbon London MadridMexico City Milan New Delhi Seoul Singapore Sydney Taipei Toronto FM Page iii Wednesday, February 23, 2000 2:30 PM data COMMUNICATIONS AND NETWORKINGP ublished by McGraw-Hill, an imprint of the McGraw-Hill Companies, Inc. 1221 Avenue of the Americas, New York, NY, 10020. Copyright 2001, 1998 by The McGraw-Hill Companies, Inc. All rights reserved. No part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written consent of The McGraw-Hill Companies, Inc.
Data Circuit–Terminating Equipment (DCE) 144 Standards 145 EIA-232 Interface 145 6.3 OTHER INTERFACE STANDARDS 152 EIA-449 153 EIA-530 157 X.21 158 6.4 MODEMS 159 Transmission Rate 160 Modem Standards 164 6.5 56K MODEMS 171 Traditional Modems 171 56K Modems 172 Why Only 56 Kbps? 174 6.6 CABLE MODEM 174 Downloading 174 Uploading 175 6.7 KEY ...
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