1、INTERNATIONAL STANDARD ISO/IEC 11584 First edition 1996-03-01 Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Circuit-mode multi-rate bearer services - Service description, functional capabilities and information flows Tech
2、nologies de Iinformation - T.4I.kommunications et Bchange dinformation entre systemes - Rkseau privk avec int 2) Information transfer rate: 128, 192, . 1920 kbit/s (Note 1); 3) Information transfer capability: Unrestricted digital information; 4) Structure: Time slot sequence integrity. Note - The s
3、upport of individual transfer rates is an implementation option. 5.3.2 Secondary information transfer attributes The secondary Information transfer attribute possibilities for this service are: 5) Establishment of communication: Demand (Notel); 6) Symmetry: Bidirectional symmetric (Note 2); 7) Commu
4、nication configuration: Point-to-point (Note 3). 4 ISOAEC ISOAEC I I 584: I 996(E) Notes 1. Only demand services are specified in this International Standard. 2. Only bidirectional symmetric services are specified in this International Standard. 3. Only point-to-point services are specified in this
5、International Standard. Multi-point configurations can be achieved using conference call supplementary services. 5.3.3 Access attributes 8) Access channel: two or more B-channels 9) Access protocol: Not defined. Note - The access attributes refer only to the user information not the signalling infor
6、mation. 6 Procedures for multi-rate bearer service within a PISN The procedures of this clause shall apply when the users concerned are users of a PISN. 6.1 Provision of services As a PISN option, multi-rate bearer service available in a PISN can be generally available, or can be available by specif
7、ic arrangement for an individual PISN user. These services can be offered with an option. An example is: PISN option Assignment of time-slots Value - Contiguous - Non-contiguous Note - This option is applied for both the calling and the called user side. 6.2 Normal procedures 6.2.1 Call establishmen
8、t at the calling user The call is originated by the PISN user requesting this service. With the request, the originating user supplies Destination number identifying the called PISN user, the information transfer rate needed (e.g. 128, 192, ) which will remain the same for the whole duration of the
9、call. Other information as required, (e.g. Originating Number) may also be included. This request may be given to the network either en bloc, containing all the required information, or not en bloc (i.e. in overlap sending). The assignment of nx64 kbiffs channels at an access has a local meaning onl
10、y. In particular, contiguous channel assignment at one interface does not mean that channels will be assigned contiguously within the network or at the terminating interface. The B-channels selected shall belong to a single interface. 5 ISO/IEC 11584:1996(E) 0 ISOhEC After initiating a call, the cal
11、ling user will receive an indication that the network is processing the request: an indication when the called user has been informed of the call and an indication when the connection has been established. 6.2.2 Call establishment at the called user The called user will receive an indication of the
12、arrival of a call for this bearer service, including the information transfer rate and will inform the network of the acceptance or rejection of the call. The assignment of nx64 kbit/s channels at an access has a local meaning only. In particular, contiguous channel assignment at one interface does
13、not mean that channels will be assigned contiguously within the network or at the originating interface. The B-channels selected shall belong to a single interface. The called user may also provide other information for use by the network to other users (e.g. connected line identity). 6.2.3 Connecti
14、on Once the connection is established between the calling and called users, the allocated time slot(s)/channel(s) is/are available for the transmission in both directions continuously and simultaneously at the information transfer rate specified at call set-up until the call is terminated. 6.2.4 Ter
15、minating the call service (call release) A call may be terminated by either or both users indicating this to the network.If one user or both users terminate the call, network will send an appropriate indication to the other user. 6.3 Exceptional procedures/unsuccessful outcome The exceptional proced
16、ures handle the following conditions: a) Failure situations due to user error l)A user inputting a network-identifiable, improper service request will be given an appropriate failure indication by the network and the call set-up will be ceased. 2)A user inputting a non-valid network number will be g
17、iven an appropriate failure indication by the network and the call set-up will be ceased. b) Failure situations due to called user state 1) A calling user attempting to establish a call to a user who is identified by the network to be busy (e.g. insufficient B-channel available) will be given an app
18、ropriate failure indication by the network. 2) A user attempting to establish a call to a user whose terminal equipment fails to respond will be given an appropriate failure indication by the network and the call set-up will be ceased. 3) On a call to a user whose terminal equipment has responded that the called user is being informed of the call but has failed to answer within a defined period of time, the calling user attempting to establish the call will be given an appropriate failure indication by the network and the call set-up will be ceased. 6
