CAN CSA-ISO IEC 8823-1A-2006 Information technology - Open Systems Interconnection - Connection-oriented presentation protocol Protocol specification AMENDMENT 1 Efficiency enhance.pdf

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1、B CReference numberISO/IEC 8823-1:1994/Amd.1:1998(E)INTERNATIONALSTANDARDISO/IEC8823-1Second edition1994-12-15AMENDMENT 11998-09-15Information technology Open SystemsInterconnection Connection-orientedpresentation protocol: ProtocolspecificationAMENDMENT 1: Efficiency enhancementsTechnologies de lin

2、formation Interconnexion de systmes ouverts(OSI) Protocole de prsentation en mode connexion: Spcification duprotocoleAMENDEMENT 1: Amliorations defficacitAmendment 1:2006 toNational Standard of CanadaCAN/CSA-ISO/IEC 8823-1-97Amendment 1:1998 to International Standard ISO/IEC 8823-1:1994 has been ado

3、pted without modification(IDT) as Amendment 1:2006 to CAN/CSA-ISO/IEC 8823-1-97. This Amendment was reviewed by the CSATechnical Committee on In formation Technology (TCIT) under the jurisdiction of th e Strategic SteeringCommittee on Information Technology and deemed acceptable for use in Canada.De

4、cember 2006ISO/IEC 8823-1:1994/Amd.1:1998(E) ISO/IEC 1998All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the publi

5、sher.ISO/IEC Copyright Office Case postale 56 CH-1211 Genve 20 SwitzerlandiiContents Page1) Subclause 2.1. 12) Subclause 2.3. 13) Subclause 3.4. 14) Subclause 3.5. 25) Subclause 4.2. 26) Subclause 4.3. 27) Subclause 5.4. 25.4 bis Protocol options 25.4 bis.1 Nominated context protocol option. 35.4 bi

6、s.2 Short encoding protocol option. 35.4 bis.3 Packed encoding rules protocol option . 35.4 bis.4 Null-encoding protocol option 35.4 bis.5 Short-connect protocol option. 48) Subclause 6.2.1 49) Subclause 6.2.2 410) Subclause 6.2.3 511) Subclause 6.2.2 512) Subclause 6.2.2.16. 513) Subclause 6.2.3.13

7、. 514) Subclause 6.2.5 615) Subclause 6.2.6 616) Subclause 6.2.7.2. 717) Subclauses 6.2.8 through 6.2.11 818) Subclauses 6.4.4.2, 6.4.4.3 and 6.4.4.6 919) Subclause 7.1.1.1. 1020) Subclause 7.1.2.1. 1021) Subclauses 7.1.4 through 7.1.6 1022) Subclause 8.1.1 1123) Subclause 8.1.2 1224) Subclauses 8.1

8、.4 through 8.1.6 1225) Subclause 8.2. 138.2 bis Short-encoding PPDUs . 14 ISO/IECISO/IEC 8823-1:1994/Amd.1:1998(E)iii26) Subclause 8.3.1 1427) Subclause 8.3.3 1528) Subclause 8.4.1.2 . 1529) Subclause 8.4.1.3 . 1530) Subclause 8.4.1.4 . 1531) Subclause 8.4.2.2 . 1532) Subclause 8.4.2.5 . 1533) Subcl

9、auses 8.4.4 through 8.4.4.2 1634) Subclause A.4.1.2. 1635) Subclause A.5. 1636) Subclause A.5.2 1637) Subclause A.6. 17ISO/IEC 8823-1:1994/Amd.1:1998(E) ISO/IECivForewordISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form thespecializ

10、ed system for worldwide standardization. National bodies that are members of ISO or IEC participate in thedevelopment of International Standards through technical committees established by the respective organization to deal withparticular fields of technical activity. ISO and IEC technical committe

11、es collaborate in fields of mutual interest. Otherinternational organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. DraftInternationa

12、l Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the national bodies casting a vote.Amendment 1 to ISO/IEC 8823-1:1994 was prepared by Joint Technical Committee ISO/IEC JTC

13、 1, Information technology,Subcommittee SC 33, Distributed application services, in collaboration with ITU-T. The identical text is published as ITU-TRec. X.226/Amd.1.ISO/IEC 8823-1:1994/Amd.1:1998(E)ITU-T Rec. X.226 (1994)/Amd.1 (1997 E) 1INTERNATIONAL STANDARDISO/IEC 8823-1 : 1994/Amd.1 : 1998 (E)

14、ITU-T Rec. X.226 (1994)/Amd.1 (1997 E)ITU-T RECOMMENDATIONINFORMATION TECHNOLOGY OPEN SYSTEMS INTERCONNECTION CONNECTION-ORIENTED PRESENTATION PROTOCOL:PROTOCOL SPECIFICATIONAMENDMENT 1Efficiency enhancements1) Subclause 2.1Add the following references by numerical order: ITU-T Recommendation X.691

15、(1995) | ISO/IEC 8825-2:1995, Information technology ASN.1 encodingrules: Specification of Packed Encoding Rules (PER). ITU-T Recommendation X.217 (1995)/Amd.1 (1996) | ISO/IEC 8649:1996/Amd.1:1997, Informationtechnology Open Systems Interconnection Service definition for the Association Control Ser

16、vice Element Amendment 1: Support of authentication mechanisms for the connectionless mode. ITU-T Recommendation X.227 (1995)/Amd.1 (1996) | ISO/IEC 8650-1:1996/Amd.1:1997, Informationtechnology Open Systems Interconnection Connection-oriented protocol for the Association Control ServiceElement: Pro

17、tocol specification Amendment 1: Incorporation of extensibility markers. ITU-T Recommendation X.216 (1994)/Amd.1 (1997) | ISO/IEC 8822:1994/Amd.1:1998, Informationtechnology Open Systems Interconnection Presentation service definition Amendment 1: Efficiencyenhancements.2) Subclause 2.3Add the follo

18、wing references by numerical order: ITU-T Recommendation X.216 (1994)/Addendum 1 (1995), Service definition for Presentation layer efficiencyenhancements. ITU-T Recommendation X.225 (1995)/Addendum 1 (1995), Protocol specification for Session layer efficiencyenhancements.3) Subclause 3.4Add the foll

19、owing new item at the end of the list:l) Upper-layer context specification.Consequently, item k) should have, at the end, a semi-colon instead of a period.ISO/IEC 8823-1:1994/Amd.1:1998(E)2 ITU-T Rec. X.226 (1994)/Amd.1 (1997 E)4) Subclause 3.5Insert the following definition by numerical order:3.5.3

20、 bis nominated context: A member of the Defined Context Set can be nominated by either PPM as its nominated context.There are independent nominated contexts for each direction of communication. There are no nominated contexts unless thenominated context protocol option is selected on the connection.

21、 If all the presentation data values in the User-data of PPDUare in the nominated context of the sender, alternative presentation PCI may be used to convey the User-data.Add the following definitions after 3.5.14:3.5.15 nominated context protocol option: An option of the presentation protocol that u

22、ses an efficient identification of thepresentation context of user data when a single presentation data value is present in the user data of a primitive.3.5.16 short-encoding protocol option: An option of the presentation protocol that uses efficient encoding of a PPDUcontaining a single presentatio

23、n data value.3.5.17 packed encoding protocol option: An option of the presentation protocol under which the Presentation PPDUs areencoded using the ASN.1 Packed Encoding Rules.3.5.18 null-encoding protocol option: An option of the presentation protocol, negotiated during connection establishment,tha

24、t permits a data transfer phase with zero presentation protocol control information.3.5.19 short-connect protocol option: An option of the presentation protocol that permits an efficient negotiation, duringconnection establishment, of the null-encoding protocol option.5) Subclause 4.2Add the followi

25、ng PPDUs at the end of the list:SHORT-CP PPDU Short Connect PPDUSHORT-CPA PPDU Short Connect Accept PPDUSHORT-CPR PPDU Short Connect Reject PPDU6) Subclause 4.3Insert the following abbreviations by alphabetical order:BER Basic Encoding RulesPER Packed Encoding Rules7) Subclause 5.4Insert the followi

26、ng new subclauses after 5.4:5.4 bis Protocol optionsProtocol options are elements of procedure defined in the Protocol Specification. Some have no effect on the support of thePresentation Service; others imply restrictions on the support of Presentation Service or can only be used with other options

27、that restrict the service.The options that do not affect support of the Presentation Service can be negotiated at presentation-connection establishment bythe Presentation protocol itself. These include the nominated context, short-encoding and packed encoding options.The null-encoding option support

28、s a restricted subset of the Presentation Service. It can be negotiated at presentationconnection establishment.The short-connect option can only be used to establish a connection that will use the null-encoding option.ISO/IEC 8823-1:1994/Amd.1:1998(E)ITU-T Rec. X.226 (1994)/Amd.1 (1997 E) 3All opti

29、ons apart from short-connect may be negotiated using the fast-associate mechanism (see 6.2.6.9). The short-connectoption and the fast-associate mechanism are mutually exclusive. All options may be the subject of a priori agreement.NOTE 1 The short-encoding and short-connect protocol options are comp

30、letely separate. Short-encoding applies to the user-data ofany PPDU on an established connection. Short-connect applies to the establishment of a connection that will use the null-encodingoption.NOTE 2 The fast associate mechanism (see 6.2.6.9) is not considered a Presentation protocol option as it

31、is implemented in the Sessionlayer. It can be used to establish a presentation connection that uses any combination of the options, except short-connect.5.4 bis.1 Nominated context protocol optionThis protocol option allows each of the protocol machines to choose one of the presentation contexts of

32、the DCS as itsnominated context. The nominated context affects the presentation protocol control information that conveys the User-data, incircumstances defined in 8.4. There are independent nominated contexts for each direction the initiators nominated contextapplies to User-data sent by the connec

33、tion-initiator, the responders nominated context applies to User-data sent by theconnection-responder. Even when the protocol option has been selected, there need not be a nominated context for either orboth PPMs.The nominated context protocol option does not affect the Presentation Service. It has

34、no implications for which sessionfunctional units are used.5.4 bis.2 Short encoding protocol optionThis protocol option allows use of the Short-encoding form of User-data for any PPDU for which it is defined if the User-datacontains only one presentation data value.This protocol option does not affe

35、ct the Presentation service. It requires support of the Special User-data parameter of theSession primitive whose User-data is the PPDU.5.4 bis.3 Packed encoding rules protocol optionWhen this protocol option is selected, the PPDUs that are specified in ASN.1 in 8.2 are encoded using the Packed Enco

36、dingRules. When the protocol option is not selected, these PPDUs are encoded using the Basic Encoding Rules. The negotiation ofthe Packed Encoding Rules protocol option is described in 6.2.6.8.5.4 bis.4 Null-encoding protocol optionWhen this protocol option is selected, no presentation protocol cont

37、rol information is conveyed over the establishedpresentation connection. In particular, no PPDUs associated with the normal and abnormal release of the connection areconveyed.The null-encoding protocol option is used on an established connection. The use of the option restricts support of thePresent

38、ation service and is only available if one of the following conditions is applicable:a) the presentation context definition list contains precisely one item in which the abstract syntax name is known tothe responding PPM by bilateral agreement;b) the presentation context definition list is empty and

39、 the default context is known by bilateral agreement;c) the presentation context definition list is empty and the abstract syntax of the default context is specified inASN.1 and is known to the responding PPM by bilateral agreement.The null-encoding does not require particular Session functional uni

40、ts.NOTE It is expected that Presentation null-encoding will typically be used with the Session no-orderly-release functional unit, andwith the Session null-encoding option, although this is not required.ISO/IEC 8823-1:1994/Amd.1:1998(E)4 ITU-T Rec. X.226 (1994)/Amd.1 (1997 E)5.4 bis.5 Short-connect

41、protocol optionThe short-connect protocol option is used only in connection establishment to establish a connection on which thenull-encoding option will be used, and thus one of the conditions in 5.4 bis.4 applies. In addition, it can only be used if both ofthe following conditions apply:a) the cal

42、ling and called presentation selectors are null;b) the presentation-requirements parameter in the P-CONNECT service includes only the kernel functional unit.The short-connect protocol option does not require particular Session functional units.NOTE It is expected that the Presentation short-connect

43、protocol option will typically be used with the Session short connectmechanism with no upper-layer context identifier present.8) Subclause 6.2.1Modify, using the following text, the second paragraph:The procedure uses the following PPDUs:If the short-connect option is not selected, the connection es

44、tablishment procedure uses:a) CP PPDU;b) CPA PPDU;c) CPR PPDU.If the short-connect option is selected, the connection establishment procedure uses:d) SHORT-CP PPDU;e) SHORT-CPA PPDU;f) SHORT-CPR PPDU.9) Subclause 6.2.2Add the following subclause after 6.2.2.8:6.2.2.8 bis Initiators nominated context

45、This shall identify the presentation context from the presentation context definition list that is proposed as the nominatedcontext for the initiating PPM. This parameter shall consist of the presentation context identifier from the appropriate item ofthe presentation context definition list.This pa

46、rameter shall only be present if the nominated context protocol option has been proposed and the presentation contextdefinition list is present.See also 6.2.6.6.Add the following subclause after 6.2.2.12:6.2.2.12 bis Protocol optionsThis shall identify the options of the Presentation protocol select

47、ed for use on this connection.Only options which were proposed in the Protocol options parameter of the CP PPDU shall be selected.See also 6.2.6.5.ISO/IEC 8823-1:1994/Amd.1:1998(E)ITU-T Rec. X.226 (1994)/Amd.1 (1997 E) 510) Subclause 6.2.3Add the following subclause after 6.2.3.8:6.2.3.8 bis Respond

48、ers nominated contextThis shall identify the presentation context from the DCS that shall be the nominated context for the responding PPM. Thisparameter shall consist of the presentation context identifier for the presentation context being nominated.This parameter shall only be present if the nomin

49、ated context protocol option has been selected and the DCS is not empty.See also 6.2.6.6.11) Subclause 6.2.2Add the following subclause after 6.2.2.15:6.2.2.15 bis Protocol optionsThis shall identify each of the options of the Presentation protocol that the initiating PPM supports and proposes for use on thisconnection.The protocol options defined are:a) nominated context;b) short-encoding;c) Packed Encoding Rules;d) null-encoding.NOTE The short-connect protocol option is not represented in this parameter, as the CP PPDU is