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Line 21 Data Services EIA/CEA-608-B EIA STANDARD Line 21 Data Services EIA/CEA-608-B EIA/CEA-608-B (Revision of EIA-608-A) OCTOBER 2000 ELECTRONIC INDUSTRIES ALLIANCE NOTICE EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than EIA members, whether the standard is to be used either domestically or internationally. Standards and Publications are adopted by EIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. Note: The user's attention is called to the possibility that compliance with this standard may require use of an invention covered by patent rights. By publication of this standard, no position is taken with respect to the validity of this claim or of any patent rights in connection therewith. The patent holder has, however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the publisher. This EIA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the EIA Standard and the IEC document can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Project Number. 4911, formulated under the cognizance of the R-4.3 Television Data Systems Subcommittee.) Published by ELECTRONIC INDUSTRIES ALLIANCE 2000 Technology Strategy & Standards Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to the current Catalog of EIA Electronic Industries Alliance Standards and Engineering Publications or call Global Engineering Documents, USA and Canada (1-800-854-7179) International (303-397-7956) All rights reserved Printed in U.S.A. PLEASE! DON”T VIOLATE THE LAW! This document is copyrighted by the EIA and may not be reproduced without permission. Organizations may obtain permission to reproduce a limited number of copies through entering into a license agreement. For information, contact: Global Engineering Documents 15 Inverness Way East Englewood, CO 80112-5704 or call U.S.A. and Canada 1-800-854-7179, International (303) 397-7956 EIA/CEA-608-B FOREWORD This standard was developed under the auspices of the Consumer Electronics Association (CEA, formerly CEMA) Technology & Standards R4.3 Television Data Systems Subcommittee. EIA-608-A was accepted as an EIA standard on September 21, 1999. Extended Data Services (XDS) are additional services provided in Line 21 Field 2 data. New services may have been standardized by CEA since the publication of this standard. No attempt is made to list XDS Private Data Services, although it is requested that users of such services notify CEA of Private Data packet assignments. XDS services, whether Private Data or not, may not be meant for transmission to the television receiver. i EIA/CEA-608-B (This page intentionally left blank.) ii EIA/CEA-608-B CONTENTS 1 Purpose and Scope........................................................................................................................ 1 1.1 Purpose ................................................................................................................................ 1 1.2 Scope................................................................................................................................... 1 1.3 Other Vertical Interval Lines................................................................................................ 1 1.4 Antecedent Documents........................................................................................................ 1 2 References..................................................................................................................................... 1 2.1 Normative References.......................................................................................................... 1 2.2 Regulatory References......................................................................................................... 2 2.3 Antecedent References........................................................................................................ 2 2.4 Reference Acquisition.......................................................................................................... 2 3 Definitions...................................................................................................................................... 3 3.1 Definitions............................................................................................................................ 3 3.2 Terms Employed.................................................................................................................. 3 3.2.1 Acronyms................................................................................................................... 3 3.2.2 Glossary (Informative)................................................................................................ 3 3.3 Compliance notation............................................................................................................ 6 4 Background (Informative)............................................................................................................... 6 4.1 Data Types in the Line 21 Signal ......................................................................................... 6 4.2 Program Distribution Paths.................................................................................................. 8 5 Signal Characteristics.................................................................................................................. 10 5.1 Introduction........................................................................................................................ 10 5.2 Line 21 Waveform.............................................................................................................. 10 5.3 Data Formats...................................................................................................................... 14 6 Closed Captioning........................................................................................................................ 14 6.1 Introduction........................................................................................................................ 14 6.2 Background and Foreground Attributes............................................................................. 14 6.3 Closed-Group Extensions (Informative)............................................................................. 16 6.4 Character Sets (Normative)................................................................................................ 17 6.4.1 Standard .................................................................................................................. 17 6.4.2 Optional Extended Characters................................................................................. 17 7 Text Mode .................................................................................................................................... 24 7.1 Introduction........................................................................................................................ 24 7.2 Text Mode Service Providers and Equipment Manufacturers ............................................ 24 7.3 Field 2 Text Bandwidth Considerations ............................................................................. 25 7.4 Real-Time Scrolling Display............................................................................................... 25 7.5 Other Real-Time Display Methods...................................................................................... 25 7.6 Delayed Display................................................................................................................. 26 7.7 Other Interruptions............................................................................................................. 26 7.8 Automatic Erasure of Text and Background....................................................................... 26 7.9 Data Channel Nomenclature for Text Services.................................................................. 26 7.10 Transmitting URLs in T-2 .................................................................................................. 26 7.11 Character Set................................................................................................................... 27 7.12 Standard Syntax .............................................................................................................
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