1、ITU-T RECHN*I.243. 8 95 m +8b2593 Ob08230 386 m INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU INTEGRATED SERVICES DIGITAL NETWORK (ISDN) SERVICE CAPAB I LITI ES 1.241.8 (1 0/95) TELEACTION STAGE ONE SERVICE DESCRIPTION ITU-T Recommendation 1.241 .8 (Prev
2、iously “CCIlT Recommendation”) ITU-T RECHN*Im2YLm 8 95 m 4862591 Ob08211 212 m FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and is
3、suing 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 ITU-T Study Groups which, in their turn, produce Recommendations
4、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). ITU-T Recommendation 1.241.8 was prepared by ITU-T Study Group 1 (193-1996) and was approved under the WTSC Resolution No. 1 proced
5、ure on the 3rd of October 1995. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O 1996 Ali rights reserved. No part of this publication may be reproduced or utilized in any for
6、m or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. . . ITU-T RECMN*I.241- 8 95 48b2591 0608212 159 = CONTENTS Scope Normative references . Definitions and abbreviations . 3.1 Definitions 3.2 Abbreviations Description and ter
7、minology 4.1 General description . 4.2 Specific terminology . Procedures 5.1 Provision and withdrawal . 5.2 Normal procedures Activation. deactivation and registration 5.2.1 5.2.2 Invocation and operation . 5.2.3 Interrogation 5.3 Exceptional procedures . 5.3.2 Invocation and operation . 5.3.3 Inter
8、rogation and editing . Handling of system fault situations . Interworking and intercommunication requirements . Applicability of supplementary services 8.1 Low layer attributes 5.3.1 Activation, deactivation and registration 5.3.4 Teleaction service attributes and values . 8.1.1 Information transfer
9、 attributes 8.1.2 Access attributes . 8.2 Higher layer attributes 8.2.1 Type of user information 8.2.2 8.2.3 Layer 5 protocol functions 8.2.4 8.2.5 Layer 7 protocol functions 8.3 General attributes 8.4 Quality of Service . 8.4.1 Transmission delay . Layer 4 protocol functions Layer 6 protocol functi
10、ons 8.4.2 Availability . 8.4.3 Fault report delay Annex A . Context used for teleaction service description Recommendation 1.241.8 (10/95) Page 1 1 2 2 2 2 2 3 4 4 4 4 5 7 7 7 7 8 8 8 9 9 9 9 10 10 10 10 10 10 10 10 10 11 11 11 13 i ITU-T RECMN*I=24L- 8 95 4862.593 Ob08233 095 SUMMARY In accordance
11、with Recommendation 1.130 i, the following three-level structure is used to describe the telecommunication services: - - Stage 1 is an overall service description, from the users standpoint; Stage 2 identifies the funcitonal capabilities and information flows needed to support the service described
12、in stage 1; Stage 3 defines the signalling system protocols and switching functions needed to implement the service described in stage 1. - This Recommendation relates to stage 1 (overall service description) for the teleaction service in the ISDN. Recommendation 1.241.8 (10/95) 11 ITU-T RECMN*I-241
13、- A 95 4862591 Ob082Lq T2L Recommendation 1.241.8 TELEACTION STAGE ONE SERVICE DESCRIPTION (Geneva, 1995) 1 Scope This Recommendation defines the stage 1 of the teleaction service for the Integrated Services Digital Network (ISDN) as provided by the public telecommunication operators or recognized o
14、perating agencies. Stage 1 is an overall service description from the users point of view (see Recommendation 1.130 i), but does not deal with the details of the human interface itself. This Recommendation defines the interworking requirements for teleaction services supported by networks other than
15、 ISDN with the teleaction services described in this Recommendation. This Recommendation does not specifj the additional requirements where the service is provided to the user via a telecommunications network that is not ISDN but does include interworking requirements of other networks with the publ
16、ic ISDN. Charging principles are outside the scope of this Recommendation. This Recommendation is applicable to the stage 2 and stage 3 Recommendations for the ISDN teleaction service. The terms “stage 2” and “stage 3” are defined in Recommendation 1.130 l. Where the text indicates the status of a r
17、equirement (i.e. as strict command or prohibition, as authorization leaving freedom, or as a capability or possibility), this shall be reflected in the text of the relevant stage 2 and stage 3 Recommendations. Furthermore, conformance to this Recommendation is met by conforming to the stage 3 Recomm
18、endation with the field of application appropriate to the equipment being implemented. Therefore, no method of testing is provided in this Recommendation. 2 Normative references The following Recommendations and other references contain provisions which, through reference in this text, constitute pr
19、ovisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision: all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recomm
20、endations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. CCITT Recommendation I. 130 (1988), Method for the characterization of telecornmunication services supported by an ISDN and network capabilities of an ISDN. CC Recommendation 1.11
21、2 (1988), Vocabulary tem for ISDNs. CCITT Recommendation 1.210 (1988), Principles of telecommunication services supported by an ISDN and the means to describe them. CCITT Recommendation Q.9 (1988), Vocabulary of switching and signalling terms. CCITT Recommendation X.2 (1988), International data tran
22、smission services and optional non facilities in public data networks and ISDNs. CCITT Recommendation X.25 (1988), Integace between Data Terminal Equipment (DTE) and Data circuit- terminating equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicate
23、d circuit. ITU-T Recommendation 1.43 1 (1993). Primary rate user-network integace - Layer I specification. IT-T Recommendation 1.430 (1993), Basic user-network interface - Layer 1 Specification. Recommendation 1.241.8 (10/95) 1 9 ITU-T Recommendations Q.920A.440 (1993), Digital Subscriber Signalling
24、 System No. 1 (DSS 1) - ISDN user- network inteace data link layer - General aspects and Q.921h.441 (1993), ISDN user-network nte$ace - data link layer specijcation. CCT Recommendation 1.450 (1988), ISDN user-network interface layer 3 - General aspects. 101 3 Definitions and abbreviations 3.1 Defini
25、tions For the purposes of this Recommendation, the following definitions apply: 3.1.1 3.1.2 3.1.3 integrated services digital network (ISDN): See 2.3A.112 2. definition 308. service; telecommunication service: See 2.uI.112 2, definition 201. supplementary service: See 2.4h.210 3. 3.2 Abbreviations F
26、or the purposes of this Recommendation, the following abbreviations are used: BNP Basic Network Provider CSPDN DTN Dedicated Teleaction Network EU End User EUT End User Terminal PSPDN PSTN Public Switched Telephone Network ROA Recognized Operating Agency SP Service Provider SPT Service Provider Term
27、inal TMF Teleaction Management Function TMFP Teleaction Management Function Provider USBS User Signalling Bearer Service Circuit Switched Public Data Network Packet Switched Public Data Network 4 Description and terminology 4.1 General description Teleaction is a teleservice providing for reliable l
28、ow volume data communication and allied processing service to the users. The teleaction service may be used for applications such as: - monitoring; - indicating; - controlling; - verifying, of remote events, operations and measurements. The teleaction teleservice allows the users to be provided with
29、 teleaction applications. The resulting communication can take place either between an EU and a SP, between EUS, or between SPs (see 4.2). A two-way simultaneous information transfer shall be continuously available during the information transfer phase. This shall apply also in such cases where only
30、 one-way information transfer is required by the application. The teleaction teleservice specified hereafter is based on the existence of a TMF in the network. Teleaction services using other telecommunication means are outside the scope of this Recommendation. 2 Recommendation 1.241.8 (10195) ITU-T
31、 RECMN*I*243. 8 95 M 4862593 06082Lb AT4 M EUS and SPs shall access the network via ISDN S/T reference point using standardiized protocols defined for teeactionl). The applications of the teleaction teleservice can be divided into two basic categories, each with its own network implications and spec
32、ific security functions. These two categories are: 1) Applications without other specific requirements regarding service reliability and security functions than those offered by the bearer service, i.e. nomsensitive applications. 2) Applications with additional security and reliability requirements,
33、 i.e. sensitive applications. Hence, several levels of reliability and security shall be offered with the teleaction service in order to ensure reliable communications paths between communicating parties and to prevent unauthorized data traffic or unauthorized access to user data. To achieve this go
34、al, TMFs shall be either added to the basic ISDN network or shall be assigned to a separate entity. The level of reliability and security shall be application dependent (see 8.4.3). Transmission delay shall conform to the delay categories defined in 8.4.1 as appropriate for the service application.
35、4.2 Specific terminology The context used for the definition of these items shall be as outlined in Annex A. 4.2.1 supporting the teleaction service. 4.2.2 of one or more of the TMFs. A TMFP may be the same as the BNP. 4.2.3 to a separate entity. The tasks of the TMF are: basic network provider (BNP
36、): The one responsible for the installation and the maintenance of the network teleaction management function provider (TMFP): The one responsible for the instailation and maintenance teleaction management function (TMF): Set of network functions added to either the basic ISDN or assigned ensure rel
37、iable communication paths between the EUTs and the SPT, i.e. to ensure available and secure access for the EUTs to the network and communication paths for the SPT in the ISDN, respectively; - - authorization of connected EUTs; - EUT functionality check; - address the appropriate EUTISPT for transfer
38、 of information generated by SPTEUT. The TMF executes these functions by polling the EUTs and the SPTs2)* 3)7 4). The TMF stores status information obtained through the polling procedures. Depending on the application, EUT status information may be sent to the SPT either on request or immediately af
39、ter a change of status has occurred. If the service provider operates through the packet switched data network or a dedicated network, the TMF is considered to be the interworking unit and is, therefore, required to perform adequate protocol translationkonversation. *) 2, SPs may be connected to net
40、works other than ISDN. Interworking with these networks will then be necessary. In this description it is expected that ail information transfer between an EUT and an SFT is routed via a TMF. This will allow the TMF to verify that an EUT - SFT communication path is available. However, paths directly
41、 between EUT and SFT may also be used if the Th4F can verify that such a path is available. This is outside the scope of this Recommendation (see also Footnote 3). It is expected that the basic ISDN at a later phase will include maintenance functions which may be used to ensure reliable communicatio
42、ns paths between EUTs and SFTs (e.g. maintenance of subscriber access). The TMF may take advantage by using these functions after they will have become available. The ISDN maintenance functions are outside the scope of this Recommendation. The possibility of performing TMFs by means other than polli
43、ng, e.g. reporting procedures is outside the scope of this Recommendation. 3, 4, Recommendation 1.241.8 (10/95) 3 ITU-T RECMN*I-241. B 95 4Bb2591 ObOB217 730 = Authorization and functionality check of the SPT are outside the scope of this Recommendation. 4.2.4 application service. end user (EU): The
44、 one to whom a teleaction application service is provided or who is affected by that 4.2.5 one or more EUS. service provider (SP): The one who, by using one or more TMFs, provides a teleaction application service to NOTE -The SP may be the BNP, the TMFP, or another organization responsible for one o
45、r more SFT. 4.2.6 monitoring of subdevices): end user terminal (EUT): A device (or location of a device) that, depending on the application (e.g. by on the basis of local conditions or by interrogation, generates information and presents this information for transmission by the network to an SP; rec
46、eives information from an SP in order to affect local conditions; upon polling requests received from a TMF executes the requested local actions (e.g. authorization, functionality checks, etc.) and sends appropriate responses to the TMF. - - - 4.2.7 application: - service provider terminal (SPT): A
47、device (or location of such a device) which, depending on the receives information from one or more EUTs for handling and processing in accordance with the application service offered by the SP; generates control messages and information requests and presents that information for transmission to one
48、 or more EUTs; monitors EUTs on the network, either by retrieving EUT status information stored in TMFs, and/or by receiving status information automatically from TMFs (e.g. alarms); receives polling requests from TMFs and sends appropriate responses to the TMF. Execution of local procedures such as
49、 authorization and functionality check are outside the scope of this Recommendation. - - - 4.2.8 bearer service, dedicated connection, etc.). end user (EU) access capability: The telecommunication means used between an EUT and a TMF (e.g. ISDN 4.2.9 a TMF, (e.g. ISDN bearer service, dedicated connection, etc.). 4.2.10 using the teleaction service. service provider terminai (SPT) access capability: The telecommunication means used between an SPT and teleaction application: The teleaction application is one specific application of
