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`"ILLUSTRATED"
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`DICTIONARY
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`3175 HANOVER
`PALQ ALTO. 01.94304
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`McGraw—Hill Illustrated
`
`Telecom Dictionary
`
`COOLEY GODWAFiD LLP
`LIBRARY
`3175 HANOVER
`_PALO ALTO, CA 94304
`
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`Other McGraw-HIII Telecommunications Books of Interest
`
`ALI - Digital Switching System
`
`ASH - Dynamic Routing in Tielecommunications Networks
`BENNER - Fibre Channel
`
`BEST 0 Phase-Locked Loops, Third Edition
`FEIT - TOP/IR Second Edition
`
`GALLAGHER 0 Mobile ilelecommunications Networking with [8—41
`GOLDBERG 0 Digital Tochniques in Frequency Synthesis
`GORALSKI - Introduction to ATM Networking
`HARTE 0 Cellular and PCS: The Big Picture
`HELDMAN 0 Information Tblecommunications
`
`HELDMAN 0 Competitive Tblecommunications
`KESSLER - ISDN, Third. Edition
`KURUPILLA - Wireless PCS
`LACHs 0 Fiber Optic Cemmunications
`
`LEE - Mobile Cellular Elecommunications, Second Edition
`LEE 0 Mobile Communications Engineering, Second Edition
`LINDBERG - Digital Broadband Networks and Services
`LOGSDON - Mobile Communication Satellites
`MACARIO 0 Cellular Radio, Second Edition
`
`PA’I'I‘AN 0 Satellite-Based Global Cellular klecommunications
`RODDY 0 Satellite Communications, Second Edition
`
`ROHDE ET AL. 0 Communications Receivers, Second Edition
`SIMON ET AL. 0 Spread Spectrum Communications Handbook
`SMITH 0 Cellular Design and Optimization
`TSAKALAKIS - PCS Network Deployment
`WINCH - Telecommunication Transmission Systems, Second Edition
`
`In order to receive‘additional information on these or any other
`McGraw~Hill titles, in the United States please call 1300—8238158.
`In other countries, contact your local McGraw~Hill representative.
`
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`McGraw-Hill Illustrated
`
`Telecom Dictionary
`
`Jade Clayton
`
`McGraw-HIII
`New York San Francisco Washington, DC. Auckland Bogota’
`Caracas Lisbon London Madrid Mexico City Milan
`Montreal New Delhi San Juan Singapore
`Sydney Tokyo Toronto
`
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`Library of Congress Cataloging-in—Publication Data
`
`Clayton, Jade.
`McGraw—Hill illustrated telecom dictionary / Jade Clayton.
`p.
`cm.
`Includes index.
`
`ISBN 0-07-012063~3 (paperback)
`1. Telecommunication—Dictionaries.
`TK5102.C57 1998
`384'.03-—~dc21
`
`I. Title.
`
`McGraw-Hill
`
`A Division of WMchw-Hill Companies
`
`98-7686
`CIP
`
`32
`
`Copyright © 1998 by The McGraw—Hill Companies, Inc. All rights reserved. Printed
`in the United States of America. Except as permitted under the United States
`Copyright Act of 1976, no part of this publication may be reproduced or distributed
`in any form or by any means, or stored in a data base or retrieval system, without
`the prior written permission of the publisher.
`'
`
`567890 FGR/FGR 9032109
`
`ISBN 0-07-012063-3
`
`The sponsoring editor for this book was Steve Chapman, the editing supervi-
`sor was Andrew Yodei; and the production supervisor was ’Ii'ha Cameron. It
`was set in 1'TC Century Light by Lisa M. Metlott through the services ofBar-ry
`E. Brown (Broker—Editing, Design and Production).
`-
`
`Printed and bound by Quebecor Printing, Fairfield.
`
`McGraw—Hill books are available at special quantity discounts to use as premiums
`and sales promotions, or for use in corporate training programs. For more informa-
`tion, please write to the Director of Special Sales, McGraw—Hill, 11 West 19th
`Street, New York, NY 10011. Or contact your local bookstore.
`'
`
`Information contained in this work has been obtained by The McGraw—Hill
`Companies, Inc. (“McGraw~Hill”) from sources believed to be reliable. However,
`neither McGraw—Hill nor its authors guarantees the accuracy or completeness of
`any information published herein and neither McGraw—Hill nor its authors shall be
`responsible for any errors, omissions, or damages arising out: of use of this infor—
`mation. This work is published with the understanding that McGraW-Hill and its
`authors are supplying information but are not attempting to render engineering
`or other professional services. If such services are required, the assistance of an
`
`appropriate professional should be sought.
`
`This book is printed on recycled, acid-free paper containing a minimum
`of 50% recycled de-inked fiber.
`
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`254 Make Busy
`
`out the bad line, which makes it look busy to the network. Your calls then
`start coming in on the other three lines. When a repair technician fin-
`ishes repairing the problem on the badfiline, he has it unbusied. Another
`temporary fix is to call forward the line from the central office. The
`phone company can do this at the customer's request.
`
`Malicious can Trace A feature offered ’by local telephone companies.
`Even though all calls are kept in an archived database, it is sometimes
`difficult to locate a single call—even if an accurate time is given. The ma-
`licious call trace or annoyance call trace “flags” a call when a customer
`hangs up and dials the call-trace feature code after receiving an annoy-
`ance call. Usually, the charge is $2.00'per trace. After the trace or “flag”
`has been made, telephone company security officials investigate the
`source of the call. If there are multiple occurrences, then the telephone
`company will press charges against the malicious caller. The person re
`ceiving the malicious calls will never find out who the caller is unless
`they are summoned to a court hearing.
`
`MAN (MetrOpolitan Area Network) See Metropolitan Area Network.
`
`Manchester Encoding A digital transmission technique that uses voltage
`change instead of voltage levels to represent bits. A zero to positive
`change indicates a “1” and a positive to zero change indicates a “."0 The
`advantage to Manchester encoding is that itis self timing. Its disadvan-
`tage is that it is very susceptible to noise, so it is only used in very spE-
`cialized applications.
`
`Manual Ring—Down Line Not really a phone line, but two phones con—
`nected together via a pair of wires and a talk battery (9 V to 24 V)-
`Signaling, such as ringing, is performed manually, by flipping a switch on
`and off rapidly, which disconnects and connects the battery. The chang-
`ing voltage imitates a weak ring voltage. Rescue teams use manual ring'
`down lines in cave and mine—shaft rescue operations because their radio
`range is very limited in underground tunnels.
`
`Map A reference to -“mapping”—— a Virtual tributary though an 0105i?“
`Carrier Circuit (00-3) over a SONET ring or end—to-end path. Mappmg
`the tributary involves telling the SONET equipment which and how
`much bandwidth within the 00 (Optical Carrier) will be designated ,a
`channel. The choices are D80, D81, D83, and STS-l. STS—l is an electrl-
`cal version of an 00-1.
`
`Mapping See Map
`
`l
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`MAT (Meridian-Administration Tools)
`
`255
`
`Marine Telephone A radio telephone that is designated specific operat—
`ing frequencies by the FCC. It is not cellular (cellular is a short-distance
`radio application), it broadcasts with more power and a much greater
`distance. Tellabs manufactures marine telephone equipment.
`.
`
`Marker Tape A plastic label built into cables that have cable 1D and specie
`fication information printed on them by the manufacturer. Marker tapes
`are uncermnon in newer polyethylene cables, because it is much easier and
`less expensive to print thecable designation on the outside of thexcable.
`
`MAR'Iians Misaddressed or Routed Tblepaclcet on a LAN or WAN.
`
`Mast Clamp A’device used to attach a ram hook to a power mast. The ram
`hook (also called a ram horn) is used to attach an aerial service Wire via
`- a drop clamp._
`
`
`
`1ij - 5;
`
`Ram Hpmcierg
`
`MastCiamprx'igm) _
`
`Mast Clamp
`
`Master Clock A reference to a BlTSs clock. A central timing device for
`synchronous networks, such as SONET networks. Bits. clocks can be
`rack mounted, just like other telecommunications equipment.
`
`MAT (Meridian Administration Tools) A Northern Telecom CTI ap-
`plication that allows a Meridian PBX system to be managed through a
`
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