ANSI INCITS 14-1983 Information Systems - Recorded Magnetic Tape for Information Interchange (200 CPI NRZI).pdf

1、ANSI INCITS 14-1983 (R2001)(formerly ANSI X3.14-1983 (R2001)for Information Systems -Recorded Magnetic Tape forInformation Interchange(200 CPI, NRZI)AmericanNationalStandardApproval of an American National Standard requires review by ANSI that therequirements for due process, consensus, and other cr

2、iteria for approval havebeen met by the standards developer.Consensus is established when, in the judgment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffected interests. Substantial agreement means much more than a simplemajority, but not n

3、ecessarily unanimity. Consensus requires that all views andobjections be considered, and that a concerted effort be made toward theirresolution.The use of American National Standards is completely voluntary; their existencedoes not in any respect preclude anyone, whether he has approved the standard

4、sor not, from manufacturing, marketing, purchasing, or using products, processes,or procedures not conforming to the standards.The American National Standards Institute does not develop standards and will inno circumstances give an interpretation of any American National Standard.Moreover, no person

5、 shall have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations should be addressed to the secretariat orsponsor whose name appears on the title page of this standard.CAUTION NOTICE: T

6、his American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, or withdrawthis standard. Purchasers of American National Standards may receive currentinformation on all s

7、tandards by calling or writing the American National StandardsInstitute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1983 by Information Technology Industry Council (ITI)All rights reserved.No part of this publication may be reproduced in an

8、yform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaANSI X3.14-1983 Revision of ANSI X3.14-1973 American National Standard for Information Systems - Recorded Magnetic Tape for In

9、formation Interchange (200 CPI, NRZI) Secretariat Computer and Business Equipment Manufacturers Association Approved September 8, 1983 American National Standards Institute, Inc American An American National Standard implies a consensus of those substantially concerned with its National scope and pr

10、ovisions. An American National Standard is intended as a guide to aid the manu- f t ac urer, the consumer, and the general public. The existence of an American National Stan- Standard dard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marke

11、ting, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review and users are cautioned to obtain the latest editions. The American National Standards Institute does not develop standards and will in no circum-

12、stances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. CAUTION NOTICE: This American National Standard may be revised

13、 or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of approval. Purchasers of American National Standards may receive current information on all stan

14、dards by calling or writing the American National Standards Institute. Published by American National Standards Institute 1430 Broadway, New York, New York 10018 Copyright 0 1983 by American National Standards Institute, Inc All rights reserved. No part of this publication may be reproduced in any f

15、orm, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Printed in the United States of America Al%M1183/6 Foreword (This Foreword is not part of American National Standard X3.14-1983.) This American National Standard presents the technique for rec

16、ording the American Na- tional Standard Code for Information Interchange, (ASCII), ANSI X3.4-1977, on mag- netic tape at 200 characters per inch (CPI) using nonreturn-to-zero - change on ones (NRZI) recording techniques. It is one of a series of standards implementing the ASCII in media. Related sta

17、ndards specify higher densities and define more fully the physical and mag- netic properties of magnetic tape, and specify a standard record format and labels. The X3Bl Technical Committee which developed this document consists of a group of experienced and qualified specialists on recording of digi

18、tal information on magnetic tape. In the development of this standard careful consideration was given to current practices, existing equipment and supplies, and the broadest possible acceptance, while providing a basis for future improvement in the use of the medium. Suggestions for improvement of t

19、his standard will be welcome. They should be sent to the Computer and Business Equipment Manufacturers Association, Suite 500,311 First Street, NW, Washington, D.C. 20001. This standard was processed and approved for submittal to ANSI by American National Stan- dards Committee on Information Process

20、ing Systems, X3. Committee approval of the standard does not necessarily imply that al1 committee members voted for its approval. At the time it approved this standard, the X3 Committee had the following members. John Auwaerter, Chair J A. N. Lee, Vice-Chair Catherine A. Kachurik, Administrative Sec

21、retary Organization Represented Name of Representative American Bankers Association . . . . . . . . . . . . . . . . . . . . . . . . Andrew Ernst Chris Crawford (Alt) American Express. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R. S. Newman R. G. Wilson (AR) American Library Associ

22、ation. . . . . . . . . . . . . . . . . . . . . . . Paul Peters D. R. Vondy (Alt) AMP Incorporated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Patrick E. Lannan C. Brill (Alt) Association for Computing Machinery . . . . . . . . . . . . . . . . . . . . . . . J. A. N. Lee Pat Skelly

23、 (Alt) Aassociation of American Railroads . . . . . . . . . . . . . . . . . . . . . . R. A. Petrash Association of Computer Users . . . . . . . . . . . . . . . . . . . . . . . Hillel Segal Thomas Kurihara (Alt) Association of the Institute for Certification of Computer Professionals . . . Thomas Kur

24、ihara Ardyn E. Dubnow (Alt) Burroughs Corporation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ira R. Purchis Jerrold S. Foley (Alt) Control Data Corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Charles E. Cooper Keith Lucke (Alt) Data General Corporation . . . . . .

25、 . . . . . . . . . . . . . . . . . . . . . . . . Steven W. Weingart Anthony M. Goschalk (Ah) Data Processing Management Association . . . . . . . . . . . . . . . . . . . . Ardyn E. Dubnow Joseph A. Federici (Alt) Digital Equipment Computer Users Society. . . . . . . . . . . . . . . . . . . James Hod

26、ges John R. Barr (AR) Digital Equipment Corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . Lois C. Frampton Gary S. Robinson (Alt) General Services Administration . . . . . . . . . . . . . . . . . . . . . . . . . William C. Rinehuls Donald J. Page (AR) GUIDE International. . . . . . .

27、 . . . . . . . . . . . . . . . . . . . . . . . . . . Frank Kirshenbaum Leland Milligan (Alt) Harris Corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sam Mathan David Abmayr (Alt) Hewlett-Packard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Donald C. Lou

28、ghry Honeywell Information Systems . . . . . . . . . . . . . . . . . . . . . . . Thomas J. McNamara Alan Teubner (Alt) IBM Corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., . Mary Anne Gray J. S. Wilson (Alt) Organization Represented IEEE Communications Society . IEEE Comput

29、er Society . Lawrence Berkeley Laboratory . Life Office Management Association. . Moore Business Forms, Inc . National Bureau of Standards. . National Communications System . NCR Corporation. Perkin-Elmer. . Prime Computer. . . . . . . Professional Secretaries International . . . . . . Recognition T

30、echnology Users Association . . . . . SHARE, Inc. . . . . . . Sperry . . . . . . Telephone Group . . . . . . Texas Instruments, Inc. . 3M Company The Travelers Insurance Companies U.S. Department of Defense. Wang Laboratories, Inc. . Xerox Corporation . . . . . . . . . Name of Represen tative Thomas

31、 A. Varetoni Robert Poston Robert S. Stewart (Alt) James A. Baker Robert J. Harvey (Alt) James J. Merrick James F. Folev. Jr (Alt) Delmer H. Odhy . Robert E. Rountree James H. Burrows (Ah) Marshall L. Cain George W. White (Alt) Thomas W. Kern William E. Snvder (Alt) Davis Ellis - . David Saunders (A

32、lt) Jeffrey C. Flowers Winfried A. Burke (Ah) Jerome Heitman P. E. Pesce (Alt) Herbert F. Schantz G. W. Wetzel (Alt) Thomas B. Steel Daniel Schuster (Ah) Marvin W. Bass Charles D. Card (Ah) Henry L. Marchese Stuart H. Garland (Alt) J. A. Owen (Ah) Presley Smith Don Caraway (Alt) R. C. Smith Joseph T

33、. Brophy William LaPlant Belkis Leong-Hong (Ah) Carl W. Schwartz Marsha Hayek (Alt) John L. Wheeler Arthur R. Machell (Ah) Technical Committee X3Bl on Magnetic Tape, which developed this standard, had the following members. Joseph S. Zajaczkowski, Chair Michael Deese, Vice-Chair M. H. Lohrenz, Secre

34、tary Michael Hogan, International Representative Henry Adair Arthur Anderson R. Bartholomew Wiiiam A. Bernett Joseph Bullock David E. Butz Sam D. Cheatham A. Ching G. 0. Dunklee Donald S. Edlerson Art Evans J. Fiori John J. Fleming Sidney B. Geller S. E. Grab1 Hakan Hemdal Dick Harlan C. Edmond Holl

35、er Kyriacos Joamrou Melvin R. Kaiser George Klechefsky T. C. Lambert Michael A. Marchese Robert McGregor Robert McKenna W. P. Mealey Jeff Menkes D. G. Osborn A. Pattillo M. Richard Pembroke William B. Poland, Jr Joseph Pomian D. 0. Rasmussen J. Resnikoff Clyde Roberts Arnold J. Rocatti H. Sallet Ant

36、hony Saratora Herbert Schantz James Sexton A. Sheehan David Sheppard Richard Silva James Smith Gene Sovereign Richard T. Steinbrenner H. J. Tait V. L. Thompson Robert S. Wooldridge Walter Wuensch Contents SECTION PAGE 1. Scope . 6 2. Definitions. . 6 3. Recording Area Markers . 6 4. Recording . 6 4.

37、1 Method . 6 4.2 Density of Recording 7 4.3 Total Character Skew 7 4.4 Erase . 7 4.5 Standard Reference Amplitude. . 7 4.6 Signal Amplitude. 9 5. Format 9 5.1 Track Format . 9 5.2 Track Dimensions 9 5.3 Reference Edge 9 5.4 Track Identification . 9 5.5 Block Length . 9 5.6 Density Identification Are

38、a 9 5.7 Gaps . 9 5.8 TapeMark . 9 6. Revision of American National Standard Referred to in This Document. . 9 Figures Fig. 1 Usable Recording Area . 7 Fig. 2 Recording Format (200 WI) . 8 Appendix Design Considerations . 10 Al. Introduction . 10 A2. Specification Support. . 10 A2.1 Tape.lO A2.2 Reco

39、rding Area Markers. . 10 A2.3 Recording Method. . 11 A2.4 Format.ll A3. Additional Considerations. 12 A3.1 Introduction . 12 A3.2 Noninterchange Applications 12 A3.3 Information Exchange Flexibility. . 12 American Natibnal Standard for Information Systems - Recorded Magnetic Tape for Information Int

40、erchange (200 CPI, NRZI) 1. Scope where a modified cyclic code is employed and which may be used for error detection and correction. This standard provides specifications for format and re- cording for a l/2-inch, g-track magnetic tape to be used for information interchange among information proces-

41、 sing systems, communications systems, and associated equipment utilizing the American National Standard Code for Information Interchange, (ASCII), X3.4-1977. density. The nominal distribution per unit length of re- corded information;usually expressed in characters per inch, end-of-tape (EOT) marke

42、r. A photoreflective marker placed on the tape for the purpose of indicating the end of the permissible recording area. in detail: general requirements, definitions, tape physi- This standard deals solely with recording on magnetic cal and magnetic requirements, tape reel, and write- tape and suppor

43、ts and complements American National Standard for Information Systems - Unrecorded Mag- enable ring. Compliance with the standard for unre- netic Tape for Information Interchange (g-Track 800 CPI, NRZI; 1600 CPI, PE; and 6250 CPI, GCR), ANSI X3.40-1983, where the following sections are dealt with co

44、rded tape is a requirement for information interchange. flux reversal. The position of a flux reversal is defined as that point which exhibits the maximum free-space flux density normal to the tape surface. interblock gap. A dc-erased section of tape separating longitudinal redundancy check (LRC) ch

45、aracter - blocks of information. NRZI. The last character placed in each block for the purpose of checking parity of each track in the block in the longitudinal direction, and for restoring all tracks to the dc erase polarity. CAUTION NOTICE: The users attention is called to the possi- bility that c

46、ompliance 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

47、 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. No representation or warranty is made or implied that this is the only license that may be required to avoid infri

48、ngement in the use of this standard. skew. The deviation of bits within a tape character from the intended or ideal placement, which is perpen- dicular to the reference edge. tape mark. A special control block recorded on magnetic tape to serve as a separator between files and file labels. total cha

49、racter skew. The deviation, during reading, from time coincidence (converted to apparent length) of the bits within a recorded character. 2. Definitions 3. Recording Area Markers beginning-of-tape (BOT) marker. A photoreflective marker placed on the tape for the purpose of indicating the beginning of the permissible recording area. block. A group of contiguous recorded characters con- sidered and transported as a unit containing one or more logical records. Blocks are separated by an inter- block gap. Each reel of tape shall be furnished with two photo- reflective markers, beginning-o