1、 INCITS/ISO/IEC 11574-1994(formerly ANSI/ISO/IEC 11574-1994)for Information Technology Telecommunications and InformationExchange Between Systems Private Integrated Services Network Circuit-mode 64 kbit/s Bearer Services Service Description, FunctionalCapabilities and Information FlowsANSI/ISO/IEC 1
2、1574-l 994 American National Standard for Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Circuit-mode 64 kbit/s Bearer Services - Service Description, Functional Capabilities and Information Flows Secretariat Information T
3、echnology Industry Council Approved August 17, 1995 American National Standards Institute, Inc. AmericanNationalStandardApproval of an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards dev
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9、StandardsInstitute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1995 by Information Technology Industry Council (ITI)All rights reserved.These materials are subject to copyright claims of International Standardization Organization (ISO),Inte
10、rnational Electrotechnical Commission (IEC), American National Standards Institute (ANSI), andInformation Technology Industry Council (ITI). Not for resale. No part of this publication may bereproduced in any form, including an electronic retrieval system, without the prior written permission of ITI
11、.All requests pertaining to this standard should be submitted to ITI, 1250 Eye Street NW, Washington, DC20005.Printed in the United States of AmericaContents Page Foreword . vii Introduction . iv Section 1: General 1 . . . Normative references 1 2.1 International Standards 1 2.2 lT l Circuit-mode 64
12、 kbit/s 8 kHz structured bearer service category usable for 3,l kHz audio infor- mation transfer A PISN shall support at least one of the above three bearer services to conform with this International Standard The scope of this International Standard does not include: l the negotiation of service at
13、 call establishment time, l the change of setvice during a call, and 0 unidirectional services This International Standard includes optional procedures for the provision of functions equivalent to the following public ISDN supplementary services: Subaddress and Multiple Subscriber Number. NOTES Supp
14、lementary services and other bearer services which can be used in conjunction with 64 kbit.s/s circuit switched bearer services specified in this International Standard are dealt with in other International Standards Service specifications are based on information concern- ing the corresponding publ
15、ic ISDN service available at time of publication of this Intemational Standard lTU-T treat Subaddressing and Multiple Subscriber Number as supplementary services The use of the Direct Dial In supplementary service of a public ISDN for calls incoming to a PISN from a public ISDN is regarded as part o
16、f the basic services in a PISN The use of the Calling Line Identification Presentation and Connected Line Identification Presentation supple- mentary services of a public ISDN for obtaining the Originating Number or the Connected Number of a call from or to a public ISDN is regarded as part of the b
17、asic services in a PISN. 6 The provision (either explicitly or implicitly) by the riser to the network, of its own number (Originating Number or Connected Number), and the provision of an Originat- ing Number or a Connected Number by a PISN to another network is a part of the basic services in a PIS
18、N and not a part of the Calling Line Identification Presentation and Connected Line Identification Presentation supplementary services Those supplementary services are concerned only with the presentation of the mnnber from the network to the served PISN user 2 Normative references The following sta
19、ndards contain provisions which, through reference in this text, constitute provisions of this Intema- tional Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Stan- dard are encourage
20、d to investigate the possibility of apply- ing the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. 2.1 International Standards ISO/lEC 11571: 1994, Informafion technology - Tele- communications and informati
21、on exchange between systems - Numbering and sub-addressing in private inte- grated services network. ISO/IEC 11579-1: 1994, Information Technology - Tele- communications and information exchange between systems - Private integrated services network - Part 1. Reference conjguration for PISN Exchanges
22、 (PINq. 2.2 ITU-T Recommendations Recommendation G.711 (1992), Primary PCM multiplex equipment for voice frequencies Recommendation I.112 (1992), Vocabulary of terms for ISDNs Recommendation I. 130 (1992), Method for the characteri- sation of telecommunication services supported by an ISDN and netwo
23、rk capabilities of an ISDN. Recommendation I. 140 (1992), Attribute technique for the characterisation of telecommunications services supported by an ISDN and network capabilities of an ISDN. 1 ISWIEC 11574: 1994 (E) Recommendation 1.210 (1992), Principles of telecommu- nications services supported
24、by an ISDN and the means to describe them. Recommendation I.231 (1992), Circuit-mode bearer sew- ice categories Recommendation 1.251.1 (1992), Number Identifcation Supplementary Services - Direct Dialling-In. Recommendation I.25 1.3 (1992), Number Identifcation Supplementary Sewices - Calling Line I
25、dentification Presentation. Recommendation 1.251.5 (1992), Number Identifcation Supplementary Services - Connected Line Identification Presentation (COLP). Recommendation 1.520 (1992), General arrangements for network intemorking behveen ISDNs. Recommendation 4.65 (1992), Stage 2 of the method for t
26、he characterisation of sewices supported by an ISDN. Recommendation X.3 1 (1992), Support of packet-mode terminal equiment by an ISDN 3 Definitions For the purpose of this International Standard, the follow- ing definitions apply. For other terms used in this International Standard, the definitions
27、in ISO/lEC 11579-l and ITU-T Rec. I. 112 apply. 3.1 call: The instance of the use of a service. 3.2 intervening network (IVN): The generic term for any real type of network which is employed for the provi- sion of inter-PINX connections. 3.3 mired public/private ISDN: An overall ISDN which consists
28、of any concatenation of public/private networks. NOTE 7. Services are transparent to the users across public and private network components of a mixed public/private network 3.4 network call control entity: The collection of network functions concerned with the control of services, as opposed to fun
29、ctions concerned with the transfer of user information. 3.5 Private Integrated Services Network (PISN): A private network. providing services to a specific set of users. NOTES 8 Contmry to a Public ISDN which provides services to the general public. 9. The term PISN covers more than a private ISDN.
30、3.6 Private Integrated Services Network Exchange (PINX): A PISN nodal entity which provides automatic 2 0 ISO/-lEC cOnnection handling functions used for the provision of telecommunication services. A nodal entity may consist of one or more nodes. 3.7 PISN user: An entity which uses telecommunica- t
31、ion services offered by a PISN, and which therefore directly or indirectly uses the services of the Network Layer. 3.8 service Telecommunication services: That which is offered by a PISN operator and/or owner to its customers in order to satisfy a specific telecommunication require- ment. Unless oth
32、erwise stated, the term “service” shall mean “bearer telecommunication service”. 3.9 user: An entity which uses telecommunication services offered by a network, and which therefore directly or indirectly uses the services of the Network Layer. 4 Symbols and abbreviations CC Clearing Cause CC FE Call
33、 Control generic functional entity CCA cfm 1 c CH CI CN cs CT DN DS FE HLC ind 1 i ISDN IS0 LLC NC ON OS OS1 PINX PISN PSI-N Call Control Agent generic functional entity confirmation call History Channel Identifier COMeh?d Number Connected Subaddress Connection Type Destination Number Destination Su
34、baddress functional entity High Layer Compatibility indication Integrated Services Digital Network International Organ used for call establishment. This bearer service category provides information transfer at 64 kbit/s without alteration between PISN users. The service can support various PISN user
35、 applications Examples include. l RELEASE-request I indication I response / confir- mation; used for call rejection and release. l speech (see Note 11); l 3,1kHzaudio(seeNote 11); l REPORT-request / indication; used for reporting to l multiple subrate information streams multiplexed the calling user
36、: into 64 kbit/s by the PISN user, - that the call is proceeding, - that the called PISN user is being alerted, - the presence of in-band tones or announcements, - of intenvorking situations, and l INFORMATION-request; used for providing addi- tional destination addressing information not provided w
37、ith the SETUP-request. In the Stage 1 description, the control aspects of services are specified in terms of the primitives listed above at the Network Call Control senice access points. The entire Network Call Control is treated as a single entity. In the Stage 2 description, the internal behaviour
38、 of Network Call Control is specified by breaking it down into a number of Functional Entities (FE) and specifying the information flows between them. The result is a model of the form shown in figure 2. The particular model used for the basic call is specified in section 3 of this International Sta
39、ndard. Other models based on this generic model are l transparent access to a public or private X.25 network (IT 0 1s0/-rEc used for specifying supplementary setvices. Supplementary services are not specified in this International Standard. USN I Network Call Control Entity SAP SAP = Senke Access Po
40、int Figure 2 - Generic model for Stage 2 Section 2 : Service Description, (stage 1 description) 6 Circuit-mode 64 kbitis unrestricted 8 kHz structured bearer service category 6.1 Definition 4 0 ISO/IEC ISOKEX 11574: 1994 (E) 0 in conjunction with a conference call supplementary service, (the procedu
41、res of which are outside the scope of this International Standard) three or more PISN users to communicate in a multi-point umfiguration Once the information channel connection has been estab- lished according to the procedures described in clauses 9 to 11, it is available for the transmission of 64
42、 kbit/s digital signals in both directions continuously and simultaneously, without alteration by the network. The network shall place no restrictions on the content of the digital signals. 6.3 Procedures a analogue network (e.g., PSTNs or private analogue networks). To effect a connection, the PISN
43、 should use a 64 kbit/s unrestricted connection between its user and the interworking function, and a 3,l kHz audio connection (or equivalent) from the interworking unit to the analogue network. NOTE 12. If additional information concerning layer 1 protcF 01s is available, the PISN may provide the i
44、nterworking function. In general, when a call originates in an analogue network, the analogue network is unable to indicate to the PISN the service required. If this is the case, the called PISN user is offered a 3,1 kHz audio bearer service with an indication of such interworking. NOTE 13 If at the
45、 called PISN user there is a terminal adaptor which is unable to accept an incomipg 3,l kHz audio call but is able to accept an incoming 64 kbitls unrestricted call, the introduction of an intenvorking function in the PISN can be achieved only if there is service negotiation between the PISN and the
46、 called terminal adaptor This capability is outside the scope of this Inte-mational Standard. These are common to all services in this International Standard and are given in clause 9. 6.4 Network capability for charging This is outside the scope of this International Standard. 6.5 Interworking cons
47、iderations 6.5.1 Interworking with a public ISDN and certain other digital network Services in this category are able to interwork with the same services in a public ISDN. The interworking function for user information transfer is null. 6.5.2 Interworking with networks supporting only a restricted d
48、igital information transfer capa- bility During an interim period, some other networks may only support restricted 64 kbit/s digital information transfer capability, i.e., information transfer capability solely restricted by the requirement that the all-zero octet is not allowed. Interworking can be
49、 achieved according to the rules given in Appendix I of IT 2) Information transfer rate: 64 kbit/s; 3) Information transfer capability: unrestricted; 4) Structure: 8 kHz integrity. l Secondary information transfer attributes The secondary information transfer attribute values for this service category shall be: 5) Establishment of communication: demand or reserved or permanent (see Note 14); 6) Symmetry: bidirectional symmetric or unidirec- tional (see Note 15); 7) Communication configuration: point-to-point or multi-point (see Note 16). l Access attributes The access attribute v
