1、CEPT T/CAC*S*LO.2 E 92 = 2326434 0033499 932 CEPT Telecom TICAC S 10.2 E Page 1 Recommendation T/CAC S 10.2 E (Cannes 1983, revised in Odense 1986, Vienna 1989 (CAC) and Athens 1992) ) Formerly Recornmendation T/SF 31 -02 E BEARER SERVICES TO BE PROVIDED BY AN INTEGRATED SERVICES DIGITAL NETWORK (IS
2、DN) Recommendation proposed by Working Group T/GT 7 “Services and Facilities“ (SF) Amendments proposed by Project Team Service Descriptions for the ISDN (SDI) Text of the Recommendation adopted by Commercial Action Committee (CAC) CONTENTS 1. General 2. List of Bearer Services 3. Descriptions of Bea
3、rer Services Annex 1 : Circuit-mode 64 kbit/s Unrestricted 8 kHz Structured Bearer Service Category Annex 2: Circuit-mode 64 kbit/s 8 kHz Structured Bearer Service Category Usable for Speech information Transfer Annex 3: Circuit-mode 64 kbit/s 8 kHz Structured Bearer Service Category Usable for 3.1
4、kHz Audio Information Transfer Annex 4: Circuit-mode Alternate Speech/64 kbis Unrestricted 8 kHz Structured Bearer Service Category Annex 5: Circuit-mode 2x64 kbit/s Unrestricted 8 kHz Structured Bearer Senrice Category Annex 6: Circuit-mode 384 kbit/s Unrestricted 8 kHz Structured Bearer Service Ca
5、tegory Annex 7: Circuit-mode 1920 kbit/s unrestricted 8 kHz structured Bearer Service Category Annex 8: ISDN Virtual Cali (VC) and Permanent Virtual Circuit (PVC) Bearer Services provided on the B-channel of the User Access: Basic and Primary Rate Annex 9: ISDN Virtual Call (VC) and Permanent Virtua
6、l Circuit (PVC) Bearer Services provided on the D-channel of the User Access: Basic and Primary Rate Annex 10: User Signalling Bearer Service Category (USBS) O Edition of November 20, 1992 CEPT T/CAC*S* three or more users in a multipoint configuration as invoked by some supplementary services. - Ea
7、ch of the reference points can be either S or coincident S and T reference points. Note 2: Nehvorkoperators can also provide information transfer with the same attributes where the reference point is T. CEPT T/CAC*S*30*2 E 72 H 23264L4 OOLL504 OOT TGAC S 10.2 E Annex 1. Page 2 CEPT Telecom CIRCUIT-M
8、ODE 64 KBIT/S UNRESTAICTED 8 KHZ STRUCTURED BEARER SERVICE CATEGORY 3. PROCEDURES 3.1. Provision and Withdrawal 3.1 .l. Provision of this bearer service category shall be by prior arrangement with the network operator. 3.1.2. As a network option this bearer service category can be offered with sever
9、al subscription options which shall apply separately to an ISBN number or a group of ISDN numbers on the interface. For each subccription option, only one value can be selected. It should be noted that in this context an interface may consist of a group of physical interfaces. Subscription options f
10、or the interface are summariced below: Subscriptlon Option Value Maximum number of information channels available m, where m is an even number not greater than the number of information channels on the interface. Maximum number of total calls pres- ent n, where n is not greaier than the number of in
11、formation channels on the interface. The user can be identified by an ISDN number or a group of ISDN numbers on the interface. More than one ISDN number can be associated with the interface only as part of a supple- mentary service such as the Multiple Subscriber Number supplementary service. In the
12、 case of one ISDN number, the option given above for the number of calls can only exceed the number of information channels in association with a supplementary service (eng. the Call Waiting supplementary service). As a network option, separate values may be specified for incoming and for outgoing c
13、alls for either or both of the limits. 3.2. Normal Procedures All user-network signalling shall be performed over the D-channel. The network shall provide out-of-band indication to indicate call progress. 3.2.1. Originating the Call (Call Establishment) A call is originated by the served user reques
14、ting from the network the required bearer service category. This request shall include an ISDN number identifying the called user. Other information, as required, for the bearer service and other information which may be required for use by the network in the supplementary service provided to the ca
15、lled user (e.g. Calling Line Identification Presentation supplementary service) may also be included. The identity of the called user can be given to the network either en-bloc, containing ail required information, or not en-bloc. Edition of November 20, i992 CEPT T/CAC*S*L0*2 E 92 2326434 003L505 T
16、46 CEPT Telecom CIRCUIT-MODE 64 KBIT/S UNRESTRICTED 8 KHZ STRUCTURED BEARERSERVICECATEGORY T/CAC C 10.2 E Annex 1. Page 3 3.2.2. 3.2.3. 3.3. 3.3.1. 3.3.2. Indication during Call Establishment Afier initiating a call the calling user shall receive an acknowledgement that the network is able to proces
17、s the call. The called user shall receive an indication of the arrival of an incoming call of this bearer service category. When an indication is received by the network that the called user is being informed of this call, the calling user shall also be given an indication that the incoming call is
18、being offered to the called user. When the connection is established, an indication of this shall be sent to the calling user. The called user may also provide other information, for use by the network in supplementary services provided to other users (e.9. the Calling Line Identification Presentati
19、on supplemen- tary service). Once the connection is established, the Bchannel is then available for transmission of 64 kbits digital signals in both directions continuously and simultaneously, without alteration by the network. No restriction is placed by the network on the content of the digital si
20、gnals (see note of clause 2). Terminating the Call The call may be terminated by either of the users by indicating this to the network. If one user terminates the call, and the other user has not yet terminated the call, an appropriate indication shall be sent to the other user. User Requirements in
21、 case of Unsuccessful Outcome (Exceptional Procedure) Situation at the Calling User Side When the network receives an improper service request from a user, the network shall give that user the appropriated indication and the call establishment shall be ceased. A user inputting an invalid ISDN number
22、 shall be given an appropriate failure indication by the network and the call establishment shall be ceased. When the network receives an incorrect ISDN number from a user, the network shall give that user the appropriate indication and the call establishment shall be ceased. Users can input network
23、 address information subsequent to the service request (.e. overlap sending). In this case, if the user fails to enter address information or subsequent parts of the address within network determined time intervals, the network shall give that user the appropriate indication and the call establishme
24、nt shall be ceased. Situations at the Called User Side A calling user attempting to establish a call to a user who is identified by the network to be busy (either network determined user busy or user determined user busy) will be given an appropriate indication by the network. A user attempting to e
25、stablish a call to a user where terminal equipment fails to respond will be given an appropriate indication by the network and the call setup will ceased. Edition of November 20, 1992 TICAC S 10.2 E Annex 1. Page 4 CIRCUIT-MODE 64 KBIT/S UNRESTRICTED 8 KHZ STRUCTURED BEARER SERVICE CATEGORY CEP“ Tel
26、ecom 3.3.3. 3.3.4. 3.4. 4. 5. 5.1. 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 establish the call within a defined period of time, the calling user attempting to establish the call will be given the appropriate fail
27、ure indication by the network and the call establishment shall be ceased. Situations due to Network Conditions A user attempting to establish a call but meeting problems due to network conditions (eng. congestion) shall be given an appropriate indication by the network. Retention of Cali information
28、 A user attempting to establish a call but meeting problems due to network conditions (e.g. congestion) or called user state (e.g. network determined user busy or user determined user busy) then according to a network option the network shall retain all of the information supplied by the calling use
29、r for the duration of the retention time. Alternate Procedures No invocation procedures are required for the reserved and permanent variants of this service. Registration, activation and deactivation procedures for these variants are outside the scope of this recommemlation. NETWORK CAPABILITIES FOR
30、 CHARGING It shall be possible to charge the customer accurately for the service. INTERCOMMUNICATION CONSIDERATIONS During an interim period some networks outside Europe may only support restricted 64 kbWs digital information transfer capability, Le. information transfer capability solely resiricted
31、 by the requirement that the all-zero octet is not allowed. Interworklng with Non-ISDNs In advance of provision of the ISDN, similar services supported by 64 kbitls connectivity will be available to customers on what may be described as digital public switched telephone network, pre-ISDNs, pilot ISD
32、Ns, or extended integrated digital networks including intelligent network. Intenvorking with ISDN customers shall be required. To reflect this, as a broad guideline, network operators shall ensure these networks have the necessary functionality at the interworking point to provide service connectivi
33、ty with the ISDN. Note: A terminal according to ETS 300 103 mnW to the ICDN via a terminal adaptor and using the arcuit- mode 64 kbitls unrestricted 8 kHz smatred bearer mka category requires the use of an InterWorking Function (IWO (including a modem) in the network for caik to Public Switched Tele
34、phone Nelwork (PSTN) users. To effect the connection, a 64 Wis connection would need to be used to the IWF and a PSTN connection of 3.1 kHz bandwidth shall be uced to the PSTN user from the IWF. Thece functions can also be provided for incoming calls. The provision of the IWF is a network option, an
35、d if provided, th13 selection of modem types to be offered is also a network option. Edition of November 20, 1992 CEPT T/CAC*S*LO*Z E 92 = 2326434 0033507 419 CEPT Telecom CIRCUIT-MODE 64 KBITIS UNRESTRICTED 8 KHZ STRUCTURED BEARERSERVICECATEGORY TICAC S 10.2 E Annex 1. Page 5 5.2. 6. 7. 7.1. Interw
36、orking with Private ISDNs The situation where the communicating users are attached to private ISDN and public ISDN is detailed in clauses 2 and 3. INTERACTION WITH SUPPLEMENTARY SERVICES Each supplementary service description identifies the applicability to this bearer service category. If the in-ba
37、nd communication is interrupted by the network as a result of one user invoking a supplementary service (e.g. the Call Hold supplementary service or the Terminal Portability supplementary service) then the network will provide an appropriate indication in the B- channel. ATTRI BUTES This includes th
38、e provision of the individual bearer services. Values of Attributes The attributes are defined in CCIlT Recommendation 1.140, Annex A, 5 A. Attributes Values Information transfer attributes: 1. information transfer mode Circuit 2. information transfer rate 64 kbws 3. information transfer capability
39、Unrestricted 4. Structure 8 kHz integrity 5. Establishment of communication Demand/reserved/permanent 6. Symmetry Bidirectional syrnrnetric/unidirectional 7. Communication configuration Point-to-point/rnultipoint Access attributes: 8. Access channel 9. Access protocol B (64 kbit/s) for user informat
40、ion; D (16 or 64 kbit/s) for signalling Signalling: ETSs 300 125 and 300 102 (see note) Note: For reservedperrnanent services the operational, administrative, and maintenance messages (OAM) related to these services may be conveyed over the Dchannel. Edition of November 20. 1992 T/CAC S 10.2 E Annex
41、 1. Page 6 CEPT T/CAC*S*LO.Z E 92 W 232b4114 001111508 755 W CEPT Telecom CIRCUIT-MODE 64 KBITB UNRESTRICTED 8 KHZ STRUCTURED BEARER SERVICE CATEGORY General attributes: 10. Supplementary services provided 11. Quality of service 12. Interworking possibilities 13. Operational and commercial aspects S
42、ee Rem T/CAC S 10.5 to 10.7 and CCITT Rec. 1.250 See Rec. T/CAC S 10.4 See CEPT User Handbook, ISDN. 8. DYNAMIC DESCRIPTION The dynamic description for this bearer service on a demand basis shall be as specified in CCIlT Recommendation 1.220. Edition of November 20, 1992 CEPT -Telecom T/CAC S 10.2 E
43、 Annex 2. Page 1 CIRCUIT-MODE 64 KBIT/S 8 KHZ STRUCTURED BEARER SERVICE CATEGORY USABLE FOR SPEECH INFORMATION TRANSFER 1. Annex 2 CIRCUIT-MODE 64 KBIT/S 8 KHZ STRUCTURED BEARER SERVICE CATEGORY USABLE FOR SPEECH INFORMATION TRANSFER DEFINITION This bearer service category is intended to support spe
44、ech information transfer between reference points. User information is provided over a B-channel and signalling is provided over a D-channel. 2. DESCRIPTION This circuit-mode bearer service category shall allow communication in both directions between: - two users (e.g. terminals, PBXs) in a point-t
45、o-point configuration to communicate via the ISDN using speech encoding into 64 kbWs digital signals over the B-channel for the duration of a call; three or more users in a multipoint configuration as invoked by some supplementary services. - The network operator may apply echo control or circuit mu
46、ltiplication and therefore,the characteristics of the speech path may be modified during the call. The network provides tones and/or announcements to support this bearer service category. Tones and/or announcements can be used to indicate the progress or otherwise of a call. The application and mean
47、ing of the tones and announcements is a national matter and outside the scope of this recommendation. The digital signal at the reference point shall conform to the CCIlT Recommendation G.711 (A-law). The network may use processing techniques appropriate for speech such as analogue transmission, ech
48、o cancellation and low bit rate encoding. Hence, bit integrity is not assured. This bearer service is not intended to support modem derived voice band data. All CCIT Recommendations for the transfer of speech information in the network apply to this service. Each of the reference points can be eithe
49、r an S or coincident S and T reference points (see CCIlT Recommendation 1.41 1). Note: Network operators can also provide information transfer with the same abutes where the reference point is T. Edition of November 20. 1992 TiCAC S 10.2 E Annex 2. Page 2 CEP7 Telecom CIRCUIT-MODE 64 KBITS 8 KHZI STRUCTURED BEARER SERVICE CATEGORY USABLE FOR SPEECH INFORMATION TRANSFER Within this bearer service category the following service variants are distinguished with respect to establishment of communications: - On demand - Reserved - Permanent 3. PROCEDURES 3.1. Pmvlsfon and Withdrawal Provision
