1、STD-ITU-T RECMN X-234 AMD 1-ENGL 1775 9 4Ab257L Ob22758 110 INTERNATIONAL TELECOMMUNICATION UN ION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS OPEN SYSTEMS INTERCONNECTION SPECIFICATIONS CONNECTIONLESS-MODE PROTOCOL X.234 (1 1/95) IN
2、FORMATION TECHNOLOGY - PROTOCOL FOR PROVIDING TRANSPORT SERVICE THE OS1 CONNECTIONLESS-MODE AMENDMENT 1 : ADDITION OF CONNECTIONLESS- MODE MULTICAST CAPABILITY Amendment 1 to ITU-T Recommendation X.234 (Previously “CCIlT Recommendation”) STD-ITU-T RECMN X-234 AMD 1-ENGL 1775 48b2571 Ob22757 057 FORE
3、WORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the i. Some 179 member countries, 84 telecom operating entities, 145 scientific and industria
4、l organizations and 38 international organizations participate in ITU-T which is the body which sets world telecommunications standards (Recommendations). The approval of Recommendations by the Members of IT-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, 1993). In additi
5、on, the World Telecommunication Standardization Conference (WTSC), which meets every four years, approves Recommendations submitted to it and establishes the study programme for the following period. In some areas of information technology which fall within IT-Ts purview, the necessary standards are
6、 prepared on a collaborative basis with IS0 and IEC. The text of ITU-T Recommendation X.234, Amendment 1, was approved on 21st of November 1995. The identical text is also published as ISO/IEC International Standard 8602. NOTE In this Recommendation, the expression “Administration” is used for conci
7、seness to indicate both a telecommunication administration and a recognized private operating agency. O ITU 1996 All rights reserved. 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 permiss
8、ion in writing from the ITU. ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS (February 1994) ORGANIZATION OF X-SERIES RECOMMENDATIONS PUBLIC DATA NETWORKS Services and Facilities I Subject area I Recommendation Series I X. 1-X. 19 Interfaces Transmission, Signalling and S
9、witching X.20-X.49 X.50-X.89 I Network Aspects I X.90-X. 149 I Maintenance Administrative Arrangements X.150-X. 179 X. 180-X. 199 OPEN SYSTEMS INTERCONNECTION Model and Notation I Service Definitions I X.210-X.219 I X.200-X.209 Connection-mode Protocol Specifications Connectionless-mode Protocol Spe
10、cifications X.220-X.229 X.230-X.239 PICS Proformas Protocol Identification - X.240-X.259 X.260-X.269 I Mobile Data Transmission Systems I X.350-X. 3 69 I Security Protocols Layer Managed Objects Conformance Testing X.270-X.279 X.280-X.289 X.290-X.299 INTERWORKING BETWEEN NETWORKS General x.300-x.349
11、 Management MESSAGE HANDLING SYSTEMS X.370-X.399 x.400-x.499 DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS X.500-X.599 Networking Naming, Addressing and Registration Abstract Syntax Notation One (ASN. 1) OS1 MANAGEMENT SECURITY OS1 APPLICATIONS Commitment, Concurrency and Recovery Transaction Processi
12、ng X.600-X.649 X.650-X.679 X.680-X.699 X.700-X.799 X.800-X.849 X.850-X.859 X.860-X.879 Remote Operations OPEN DISTRIBUTED PROCESSING X.880-X.899 X.900-X.999 STD-ITU-T RECMN X.23Li AND 1-ENGL 1995 qBb2591 0b227b3 705 STD*ITU-T RECMN X-234 AMD 1-ENGL L775 4db257L Ob227b2 b4L CONTENTS summary . Introdu
13、ction . Clause 1 Subclause 3.3.2 . Subclause 5.2 Subclause 5.3.1 . Subclause 5.3.2.3 Subclause 6.2.4.1 Subclause 6.2.4.2 Subclause 6.2.4.3 Subclause 7.2.4.1 Annex B . ITU-T Rec . X.234 (1994)/Amd.l(1995 E) Page 11 II 1 1 1 1 1 2 2 2 2 2 1 Summary IT-T Rec. X.234 I ISOAEC 8602 specifies the protocol
14、for providing the OS1 connectionless-mode Transport protocol. This amendment provides the capability for the connectionless-mode Transport protocol to support multicast PDU transfer when used in conjunction with the multicast services of the connectionless-mode Network service. Introduction This ame
15、ndment to IT-T Rec. X.234 (1994) I ISO/IEC 8602: 1995 provides the capability to the connectionless-mode Transport protocol to support multicast PDU transfer when used in conjunction with the multicast services of the connectionless-mode Network service. The protocol for providing the connectionless
16、-mode Transport service is contained entirely in ITU-T Rec. X.234 I ISOAEC 8602. ITU-T Rec. X.234 I ISO/IEC 8602 restricts the connectionless-mode Transport to the case of exchanging TPDUs between one sending TS-user and one receiving TS-user. Subnetwork standards exist which support the transfer of
17、 a SDU from one entity to a number of other entities in a single logical operation. Work is on-going to develop the capabilities for exchanging multicast PDUs at the Network layer. This amendment is directed at providing multicast Transport service via multicast capabilities of the Network service i
18、f they are available. With the current -T Rec. X.234 I ISOAEC 8602, no Transport layer capabilities are described to utilize such multicast Network services. This amendment defines additional assumptions concerning the services optionally provided by the Network layer and adds no new functions of it
19、s own. 11 ITU-T Rec. X.234 (1994)/Arnd.l(1995 E) STD.ITU-T RECNN X.23Li AND 1-ENGL 1775 48b257L Ob227b4 414 ISOLEC 8602 : 199YAmd.l: 1996 (E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - PROTOCOL FOR PROVIDING THE OS1 CONNECTIONLESS-MODE TRANSPORT SERVICE AMENDMENT 1 Addition
20、 of connectionless-mode multicast capability 1) Clause 1 Change the end of item a) of thefirst paragraph from “to one peer transport entity;” to “to one or more peer transport entities;”. 2) Subclause 3.3.2 Add to the end of the paragraph: “The destination-transport address may identify a group of t
21、ransport service users connected to different network entities depending on the services used and provided by the network service provider.” 3) Subclause 5.2 Add a new sentence at the end of the last paragraph: “Depending on the services provided by the network service, a transport user may be able
22、to send data to a group of other transport users and receive PDUs intended for a group of transport users via the use of the destination address parameters in Table 3.” 4) Subclause 5.3.1 Change the last sentencefrom “towards one TS-user” to “towards one or more TS-users” 5) Subclause 5.3.2.3 Change
23、 the start of the sentence from “This function determines the network address” to “For non-multicast transmission, this function determines the network address”. Add a new sentence at the end of the paragraph: . “For multicast transmission, this function determines the group network address that wil
24、l be used as a destination parameter in an N-UNITDATA request by examining the group transport address specified by the destination address parameter of a T-UNITDATA request.” ITU-T Rec. X.234 (1994)/Arnd.l(1995 E) 1 STD-ITU-T RECMN X-234 AMD L-ENGL 1995 48b259L Ob227b5 350 ISOAEC 8602 : 199YAmd.l:
25、1996 (E) CLM 6) Subclause 6.2.4.1 Connectionless-mode Multicast Network Service 6.2 O Yes No Change the start of the first paragraph from “The source and” to “For non-multicast transmission, the source and”. Add a new sentence at the end of the first paragraph: “For multicast transmission, the sourc
26、e and destination address parameters of the T-UNITDATA request service primitive are used to determine the source network address, source TSAP-ID, destination group network address, and destination TSAP-ID.” 7) Subclause 6.2.4.2 Change the start of the fourth paragraph from “The destination” to “For
27、 non-multicast transmission, the destination” Add a new sentence at the end of the fourth paragraph: “For multicast transmission, the destination group network address from the N-UNITDATA indication and the destination TSAP-ID from the UD TPDU will be used to determine the destination group transpor
28、t address parameter for the T-UNITDATA indication.” 8) Subclause 6.2.4.3 Change the first sentence of the first paragraph from “a pair of NSAPs.” to “a pair of NSAPs or a sending NSAP and a group of receiving NSAPs.” Add the following text to the end of 6.2.4.3: “For multicast transmission, transpor
29、t entities assume the multicast Network services optionally provided by the Network layer.” 9) Subclause 7.2.4.1 Change the second parameter code from “Destination TSAF” to “Destination TSAP or group Transport address”. Replace the Parameter value text with “Identifier of the source TSAP and destina
30、tion transport address, respectively” Add a note to the end of 7.2.4.1: multicast transfer, the destination TSAP-ID field is used to identify the destination group transport address.” “NOTE - For non-multicast transfer, the destination TSAP-ID field is used to identify the destination TSAP address. For 10) AnnexB Add the following row to the end of B.7.3 table: 2 ITU-T Rec. X.234 (1994)lAmd.l (1995 E) STD-ITU-T RECMN X-234 AMD 1-ENGL 1775 m 4862593 Ob227bb 297 m Printed in Switzerland Geneva, 1996
