1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.223 Amendment I (I 0/96) SERIES X: DATA NETWORKS AND OPEN SYSTEM COMMUNICATION Open System Interconnection - Connection-mode protocol specifications Use of X.25 to provide the OS1 connection-mode network se
2、rvice for ITU-T applications Amendment I : Transit delay and other ref i nem en ts ITU-T Recommendation X.223 - Amendment I (Previously CCITT Recommendation) ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATION PUBLIC DATA NETWORKS Services and facilities Interfaces Transmissio
3、n, signalling and switching Network aspects Maintenance Administrative arrangements Model and notation OPEN SYSTEM INTERCONNECTION X.1-X.199 X.1-X.19 X.20-X.49 X.50-X.89 X.90-X.149 X.150-X.179 X. 180-X. 199 X.200-X.299 X.200-X.209 Service definitions X.210-X.219 Connectionless-mode protocol specific
4、ations X.230-X.239 PICS proformas X.240-X.259 X.260-X.269 Protocol Identification Security Protocols X.270-X.279 X.280-X.289 Layer Managed Objects Conformance testing X.290-X.299 INTERWORKING BETWEEN NETWORKS x.300-x.399 General x.300-x.349 Satellite data transmission systems x.350-x.399 MESSAGE HAN
5、DLING SYSTEMS x.400-x.499 DIRECTORY x.500-x.599 OS1 NETWORKING AND SYSTEM ASPECTS X.600-X.699 Networking X.600-X.629 Efficiency X.630-X.649 Naming, Addressing and Registration X.650-X.679 Abstract Syntax Notation One (ASN. 1) X.680-X.699 OS1 MANAGEMENT X.700-X.799 Systems Management framework and ar
6、chitecture X.700-X.709 Management Communication Service and Protocol X.710-X.719 Structure of Management Information X.720-X.729 SECURITY X.800-X.849 OS1 APPLICATIONS X.850-X.899 Commitment, Concurrency and Recovery X.850-X.859 Transaction processing X.860-X.879 Remote operations X.880-X.899 Managem
7、ent functions x.730-x.799 OPEN DISTRIBUTED PROCESSING x.900-x.999 For furrher details, please refer to ITU-T List of Recommendations. FOREWORD The ITLJ-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The IT-T is responsible for st
8、udying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the IT-T Study
9、 Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the IT-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). Amendment 1 to ITLJ-T Recommendation X.223 was prepared by IT-T Study Group 7
10、 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 5th of October 1996. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O IT 1997 All rights reserve
11、d. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the IT. , Recommendation X.223lAmd.l (10/96) 1 - STD-ITU-T RECMN X-223 AMD 1-ENGL 277b m iib2571 Ob32ii52 TbO C
12、ONTENTS Page 1) Changes to References . 1 2) Changes to Abbreviations 1 3) Change to Overview . 1 4) Change to Table 2 2 5) Editorial Change to Use of the Address Field 6) Change to Transit Delay Processing 2 7) Editorial Change to Reset Service/Originator-Reason Codes Processing 2 8) Change to ISOA
13、EC 8878 and X.223 Differences 2 2 11 Recommendation X.223lAmd.l (10/96) SUMMARY Recommendation X.223 shows how to map the X.25 packet layer protocol to the network service dened in I I Recommendation X.2 13. This amendment provides enhanced processing requirements for ransit delay while also editori
14、ally revising the text to bring it up to date. . Recommendation X.223/Amd.l (10/96) 111 STDeITU-T RECMN X.223 AMD 1-ENGL 177b 98b2593 Ob3295Li 833 Amendment 1 to Recommendatioa X.223 USE OF X25 TO PROVIDE THE OS1 CONNECTION-MODE NETWORK SERVICE FOR ITU-T APPLICATIONS AMENDMENT 1 Transit delay and ot
15、her refinements (Geneva, 1996) 1) Changes to References On page 3 make the following changes to the Normative references clause. Subclause 2.1 O Add the following reference to appear first in this subclause: - IT-T Recommendation X.200 (1994) I ISO/IEC 7498-1 : 1994, Information technology - Open Ss
16、tems Interconnection - Basic Reference Model: The Basic Model. a Change the year ofpublication for X213fiom “1992” to “1995”. a Change the year ofpublication for ISO/IEC 8348fiom “1993” to “1996”. a The reference to ISO/IEC 8348 can be left blank. The TSB should complete this information by the time
17、 of publication of X.223 or put a footnote to indicate it will be published shortly. Subclause 2.2 a Delete this subclause (since the one reference has been moved to 2. I), Subclause 2.3 O Renumber this subclause to be 2.2. O Change the year ofpublication forX25fiom “1993” to “1996”. Change the year
18、 ofpublication for ISO/IEC 8208fiom “1990” to “1995” O 2) Changes to Abbreviations No changes are needed. 3) Change to Overview a Onpage 7, subclause 5.1, second item a) on “optional user facilities”: Change item 4 to readas follows: Transit Delay Selection and Indication (facility used if operating
19、 in a packet-switched network environment). Recommendation X.223lAmd.l (10/96) 1 4) Change to Table 2 O Page 9, item inX25/PLP column on “Transit Delay Selection and Indication Facility”: Add a superscript c) at Page 9, item in X 25/PLP column on “Fast Select Facility”: Change the superscript c) to
20、d). Page 9, add a new note e) under the table to read as follows: the end of this item for a new footnote). e O The Transit Delay Selection and Indication Facility shall be used only in a packet-switched network environment. O Page 9, change the existing identifier for the third Noteji-om c) to d).
21、(The change approved to add “Basic” before the Throughput Class Negotiation Facility and the Minimum O Throughput Negotiation Facility is no longer needed since it was included in the published text.) 5) O Editorial Change to Use of the Address Field Page 9, 6.2.2.1.1, item c): Addparenthesis around
22、 “DI” to read (DI)” 6) Change to Transit Delay Processing Page 14, 6.2.5.2.1, item d), line I: Change “When the operational mode is DTE-to-DCE,” to “When operating in a DTEDCE environment”. 0 O Page 14, 6.2.5.2.1, item 4, lines 4-5: Change this to read as follows: “not constrained by this Recommenda
23、tion); when operating in a DTEDTE environment, the TDSAi Facility shall not be used.” O Page 15, 6.2.5.2.2, paragraph I, line 2: Change “NNZL” to “NL”. 7) No change is needed here since the item approved was included in the published text. (This was to delete a comma that resulted in an incorrect pa
24、rsing of the combination of cause and diagnostic codes.) Editorial Change to Reset Service/Originator-Reason Codes Processing 8) Change to ISO/IEC 8878 and X.223 Differences Page 35, Appendix V, item 4, paragraph 2: Delete this paragraph. (The difference identified here on the handling of transit de
25、lay in a DTEDTE environment was resolved with the changes identified above.) O 2 Recommendation X.2231Amd.l (10196) STD*ITU-T RECNN X-223 AND 1-ENGL L77b Li8b2571 Ob3LLi5b bob Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series
26、N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression General telecommunication statistics General tariff principles Telephone network and ISDN Non-telephone telecommunication
27、 services Transmission systems and media Transmission of non-telephone signals Integrated services digital network Transmission of sound-programme and television signals Protection against interference Construction, installation and protection of cables and other elements of outside plant Maintenanc
28、e: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound-programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality Switching and signalling Telegraph transmission Te
29、legraph services terminal equipment Terminal equipments and protocols for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communication Programming languages STD-ITU-T RECMN X-223 AMD 1-ENGL 177b 4Bb2591 Ob31457 5Li2 W lllllllllll1lllll111lllllllllllllll *10538* Printed in Switzerland Geneva, 1997
