1、CEPT T/GSI*O3-05 E 85 m 2326434 0005308 8 m T/GSI O1 -05 E Page 1 Recommendation T/GSI 01-05 (Nice 1985) concerning General modelling method Recommendation proposed by the Special Group Intergration (GSI) Text of the Recommendatiori adopted by the “Telecommtmications” Commission: “The European Confe
2、rence of Posts and Telecommunications Administrations, Considering - the common CEPT approach to the ISDN and general CEPT assumptions and policies for the evolution towards ISDN; - the I. Series Recommendations of the CCITT, as well as other CCITT Recommendations on ISDN, to which - the need for CE
3、PT Administrations to have more precise answers to their specic European requirements, Le. - the need for CEPT Administrations to have as a base a comprehensive set of Recommendations, in order to CEPT Administrations have contributed most significantly; to select and further define material from CC
4、ITT Recommendations; promote and strengthen European harmonisation. Recommends - to the members of the CEPT, that they evolve their telecommunication networks towards ISDN according to the O guidelines and specifications given in the attached text.” Edition of September 15, 1985 CEPT T/GSI*O3-05 E 8
5、5 2326434 0005309 T = T/GSI O1 -05 E Page 3 FOR THE CHARACTERIZATION OF TELECOMMUNICATION SERVICES SUPPORTED BY AN ISDN AND NETWORK CAPABILITIES OF AN ISDN 1. GENERAL CONSIDERATIONS 1.1. The concept and the principles of ISDNs are described in Recommendation T/GSI 01-02. The Recommendations in the T
6、/GSI 02 series cover the aspects of the Telecommunication services suppor- ted by ISDNs. The T/GSI 03 series of Recommendations deals with the aspects relating to the overall network and to network functional entities. 1.2. The purpose of this Recommendation is to provide a method for the characteri
7、zation of Telecommunication services and Network Capabilities in an ISDN. 2. AXTRIBUTE METHOD 2.1. Outline of the Method This characterization should be made by using a set of attributes (see Figure 1). An attribute is defined as a specified characteristic of an object or element whose values distin
8、guish that object, element from others (T/GSI 01-03: Definitions 208, 207, 315). Particular values are assigned to each attribute when a given Telecommunication Service or Network Capability is described and specified. Characterization by attributes should be used in the ISDN series of Recommendatio
9、ns when appropriate. 2.2. Basic Rules - Each attribute is assigned a name and definition. - A given attribute should have the same name and denition in all Recommendations. - Some attributes may apply to only one object, others may be applicable to several objects. In this case - A given value shoul
10、d have the same name and the same definition in all the Recommendations. - Depending on the nature of the object described, a particular attribute may need to be used more than the same attribute name is to be used. once. Each attribute should be described by three perspectives : Generic, Service an
11、d Network. 2.3. List of Generic Attributes Information Transfer Mode. Information Transfer Rate. Information Transfer Capability. Establishment. Symmetry. Configuration. Structure. Channel (rate). Establishment/Release Protocol. Information Transfer Protocol. Performance. Interworking. Operations. T
12、ype of user information. High layer protocol. Note: This list will be completed according to further results on studies of connectionless, multi media, broad band and mobile services. Edition of September 15, 1985 CEPT T/GSI#OL-OC E 5 2326414 0005310 b T/GSI O1 -05 E Page 4 2.4. 2.4.1. 2.4.2. 2.4.3.
13、 2.5. 2.5.1. 2.5.2. Attributes for Telecommunication Services Bearer services 1 Information Transfer Mode. 2 3 Type of Information Transfer. 4 Structure. 5 Establishment of Communication. 6 Configuration of Communication. 7 Symmetry. 8 Channel (rate). 9-1 Communication Establishment/Release Protocol
14、. 9-2 Information access Protocol (see Note 2). Information Transfer Rate (see Note 1). 10 Supplementary services provided. 11 Quality of Service. 12 Service Interworking. 13 Operational and Commercial. Note 1: Service information transfer rate considered at the access point. Note 2: Information acc
15、ess protocol (layer 1-3) at the access point. Teleservices 1, 2, 3, 4, 5, 6, 7, 8, 9-1, 9-2: refer to section 2.4.1. 11 Type of user information. 12 Layer 4 protocol. 13 Layer 5 protocol. 14 Layer 6 protocol. 15 Layer 7 protocol. 16 Supplementary services applicable. 17 User-oriented QoS. 18 Interwo
16、rking. 19 Operational and Commercial. Supplementary Services For further study. Network Attributes Connection types 1 Information Transfer Mode. 2 Information Transfer Rate (see Note 1). 3 Information Transfer Capability. 4 Establishment of Connection. 5 Symmetry. 6 Configuration of Connection. 7 St
17、ructure. 8 Channel/Path (rate). 9 Connection Establishment/Release Protocol. 10 Information Transfer Protocol (see Note 2). 11 Network Performance. 12 Network Interworking. 13 Operations and Management. Note I: Information transfer rate is considered between access points. Note 2: Information transf
18、er protocol is considered between access points. e Other Network entities The definition of attributes for Connection elements, basic Connection components, Network Capabilities to support Supplementary services need further study. Edition of September 15, 1985 CEPT T/GSI*O1-05 E 5 W 232b4L4 0005311
19、 8-, T/GSI O1 -05 E Page 5 2.6. Attribute Definition A provisional list of definitions of attributes and values for Bearer services and Connection types is contained in the Appendix to this Recommendation. The sub-attributes and the level dependent forms of attributes have been omitted to improve cl
20、arity. In some cases the values for attributes are not figures but references to other Recommendations to be used. They dont appear in the Appendix. 3. APPLICATION TO THE I. SERTES OF RECOMMENDATIONS This method has been applied in Recommendations T/GSI 02-02 and T/GSI 02-03 for the specification of
21、 the Telecommunication Services supported by an ISDN and in Recommendation T/GSI 03-04 for the characterization of ISDN Connection types. Figure 1 illustrates the relationship between the different concepts used in the T/GSI series of Recommenda- tions. 1 l I I I I I -e- A Dom i na n t attributes i
22、A Dominant I attribut es I I (11) onnections I lu Area A Area I = Elements to be described. Area II = Classification. Area N = Network (Connection). Area S = Services. Area R = Relation between Services and Connections. = Description using the attribute method. Figure 1. Concepts used to characteriz
23、e telecommunication services and connections. Some of the attributes are considered as being dominant attributes. They are used to identify Bearer service Categories in T/GSI 02-02 and classes of Connection types in T/GSI 03-04. The other attributes are considered as secondary attributes and qualify
24、ing attributes. Any combination of secondary attribute values for the same dominant attribute values defines a type within the Class/Category of the described element. The qualifying attributes further define the element identified by the dominant and secondary attributes. Edition of September 15, 1
25、985 _p_ f - CEPT T/GSI*03-05 E 85 m 2326434 0005332 T m T/GSI 01-05 E Page 6 Appendix DEFINITIONS OF ATTRIBUTES AND VALUES 1. SERVICE ATTRIBUTE DEFINJTIONS Information transfer mode This attribute describes the operational mode for transferring (transportation and switching) user information through
26、 the ISDN. Possible values: - circuit, - packet. Information transfer rate This attribute describes either the bit rate (circuit mode) or the throughput (packet mode). It refers to the transfer of digital information at the access points. Possible values: appropriate bit rate, throughput rate. Type
27、of information transfer This attribute describes the capability associated with the transfer of different types of information through the ISDN. Possible values: - Unrestricted digital information. - Speech. - 3.1 kHz Audio. - 7 kHz Audio. - 15 kHz Audio. - Video. - Other values. Structure This attr
28、ibute refers to the capability of the ISDN to deliver information to the destination access point or reference point in a structure (e.g. time interval for circuit mode, service data unit for packet mode), that was presented in a corresponding signal structured at the origin (access point or referen
29、ce point). Possible values: - 8 kHz integrity. - Service data unit integrity. - Unstructured. Establishment of communication This attribute describes the mode of establishment associated to Telecommunication service used to establish and release a given communication. Possible values: - Demand. - Re
30、served. - Permanent. Configuration of communication This attribute describes the spatial arrangement for transferring information between two or more access points. It completes the structure associated to a Telecommunication service as it associates the relationship between the access points involv
31、ed and the flow of information between these access points. Possible values: - Point-to-point. - Multipoint. - Broadcast. r Y a Edition of September 15, 1985 CEPT T/GSI*O3-05 E 85 M 2326434 0005333 3 M T/GSI 01-05 E Page 7 Symmetry This attribute describes the relationship of information flow betwee
32、n two (or more) access points or reference points involved in a communication. Possible values: - Unidirectional. - Bidirectional symmetric. - Bidirectional asymmetric. Channel (rate) This attribute describes the channels and their bit rate used to transfer the user information and/or signalling inf
33、ormation at a given access point or reference point. Possible values: name of the channel (letter) and the corresponding bit rate. Communication establisbment/release protocol, information access protocol These attributes characterize the protocol on the signalling and/or user information transfer c
34、hannel at a given access point or reference point. Possible values: appropriate protocol. Supplementary services provided This attribute refers to the supplementary services associated to a given Telecommunication service. Quality of service This attribute is described by a group of specific sub-att
35、ributes. The identification of sub-attributes and the values are under study. Service interworking For further study. Operational and commercial For further study. 2. NETWORK ATTRIBBUTE DEFINITIONS Information transfer mode This attribute describes the operational mode for transferring (transportati
36、on and switching) user information through the ISDN. Possible values: - circuit, - packet. Information transfer rate This attribute describes either the bit rate (circuit mode) or the throughput (packet mode). It refers to the transfer of digital information between two access points or reference po
37、ints. Possible values: appropriate bit rate, throughput rate. Information transfer capability This attribute describes the capability associated with the transfer of different types of information through the ISDN. Edition of September 15, 1985 T/GSI O1 -05 E Page 8 Possible values: - Unrestricted d
38、igital information. - Speech. - 3.1 kHz Audio. - 7 kHz Audio. - 15 kHz Audio. - Video. - Other values. Establishment of connection This attribute describes the mode of establishment used to establish and release the connections in an ISDN. Possible values: - Switched. - Semi-permanent. - Permanent.
39、Symmetry This attribute describes the relationship of information flow between two (or more) access points or reference points of a connection. Possible values: - Unidirectional. - Bidirectional symmetric. - Bidirectional asymmetric. Connection configuration This attribute describes the spatial arra
40、ngements for transferring information on a given connection. It consists of three sub-attributes. Therefore no value is affected. Structure This attribute refers to the capability of the ISDN to deliver information to the destination access point or reference point in a structure (e.g. time interval
41、 for circuit mode, service data unit for packet mode), that was presented in a corresponding signal structured at the origin (access point or reference point). Possible values: - 8 kHz integrity. - Service data unit integrity. - Unstructured. Chamellpath (rate) This attribute describes the channels
42、and their bit rate used to transfer the user information and/or signalling information at a given access point or reference point. Possible values: name of the channel (letter) and the corresponding bit rate. Note: This attribute can be used several times. Connection establishment/Release protocol,
43、information transfer protocol These attributes characterize the protocol on the signalling and/or user information transfer channel at a given access point or reference point. Possible values: appropriate protocol. Note: This attribute can be used several times. Network performance This attribute de
44、scribes the network performance that relates to an ISDN connection. Network interworking For further study. Operation and management For further study. - e Edition of September 15, 1985 - CEPT T/GSI*O3-05 E 85 2326434 0005335 5 T/GSI O1 -05 E Page 9 3. DEFINION OF THE VALUES Unrestricted digital inf
45、ormation Transfer of information sequence of bits at its specified bit rate without alteration. This implies: - bit sequence independence, - digit sequence integrity, - bit integrity. Speech Digital representation of speech coded according to a specified encoding rule (e.g. A Law, p Law). 3.1 kHz au
46、dio Digital representation of audio information such as voice band data and speech with a bandwith of 3.1 kHz, the encoding rule being specified (e.g. A Law, p Law). 7 kHz audio Digital representation of audio information with a bandwidth of 7 kHz, the encoding rule being specified. 15 kHz audio Dig
47、ital representation of audio information with a bandwidth of 15 kHz, the encoding rule being specified. Video Digital representation of video image information, the encoding rule being specified. o 8 kHz integrity This value applies when (i) at each user-network interface, intervals of 125 ps are im
48、plicitly or explicity demarcated, and (ii) all bits submitted within a single demarcated 125 ps interval are delivered within a corresponding single demarcated 125 ps interval. Service data unit integrity This value applies when (i) at each user-network interface, protocols provide a mechanism for i
49、dentifying the boundaries of service data units (e.g. X.25 complete packet sequence), and (ii) all bits submitted within a single service data unit are delivered in a corresponding service data unit, Unstructured This value is applicable when the Telecommunication Service or connection neither provides structural boundaries nor preserves structural integrity. Demand (communication) The communication can be started as soon as possible after the request is made (e.g. tl-to is as short as possible). Communication an connection release occurs
