ITU-T I 232 3-1993 USER SIGNALLING BEARER SERVICE CATEGORY (USBS)《用户信令承载业务种类-综合服务数字网络(ISDN)-服务能力-ISDN支持的承载业务 研究组18 1》.pdf
《ITU-T I 232 3-1993 USER SIGNALLING BEARER SERVICE CATEGORY (USBS)《用户信令承载业务种类-综合服务数字网络(ISDN)-服务能力-ISDN支持的承载业务 研究组18 1》.pdf》由会员分享,可在线阅读,更多相关《ITU-T I 232 3-1993 USER SIGNALLING BEARER SERVICE CATEGORY (USBS)《用户信令承载业务种类-综合服务数字网络(ISDN)-服务能力-ISDN支持的承载业务 研究组18 1》.pdf(16页珍藏版)》请在麦多课文档分享上搜索。
1、ITU-T RECMN*I-232- 3 93 4862591 0583795 525 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 1.232.3 INTEGRATED SERVICES DIGITAL NETWORK (ISDN) SERVICE CAPABILITIES BEARER SERVICES SUPPORTED BY AN ISDN (03/93) USER SIGNALLING BEARER SERVICE CATEGORY (USBS)
2、ITU-T Recommendation 1.232.3 (Previously “CCITT Recommendation”) ITU-T RECMN*I.232- 3 73 H 4862571 0583796 461 W FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecom- munication Union. The ITU-T is responsible for studying technical, ope
3、rating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in thei
4、r turn, produce Recommendations on these topics. ITU-T Recommendation 1.232.3 was revised by the ITU-T Study Group I (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES 1 As a consequence of a reform process within the Intemational Telecommunication Union (ITU), the CCITT ce
5、ased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of .this Recomm
6、endation, no change has been made in the text to references containing the acronyms “CCITT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 telecommun
7、ication administration and a recognized operating agency. In this Recommendation, the expression “Administration” is used for conciseness to indicate both a O ITU 1994 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical
8、, including photocopying and microfilm, without permission in writing from the ITU. ITU-T RECMN+Im232. 3 93 4862591 0583797 3T8 W CONTENTS 1 Definition . 2 Description . 2.1 General description . 2.2 Specific terminology . 3 Procedures 3.1 Provision/withdraw al 3.2 Normal procedures 3.3 Exceptional
9、procedures . 3.4 Alternative procedures 4 5 Interworking requirements . 6 7 Attributes 8 Provision of user signalling bearer service 9 Dynamic description Network capabilities for charging Interaction with supplementary services Annex A - Network flow control mechanism for user signalling bearer ser
10、vices Page 1 3 3 3 4 4 5 13 Recommendation 1.2323 (03/93) 1 ITU-T RECMN*I*232- 3 93 ICIB 4862593 0583798 234 Recommendation 1.232.3 USER SIGNALLING BEARER SERVICE CATEGORY (USBS) (Melbourne, 1988; revised at Helsinki, 1993) 1 Definition This bearer service category is intended to support transfer of
11、 service data units (SDUs) via the D-channel. It is to be used in applications where limited amounts of information are to be exchanged between customer installations, or where information must be exchanged between customer installations and high layer functions) (HLFs) in the ISDN. Examples of such
12、 applications include support of user management protocols, and transfer of control information between any kind of user equipments including ISPBXs across a public ISDN. 2 Description 2.1 General description The user signalling bearer service (USBS) allows the user to send and receive information o
13、n a D-channel. This information is passed transparently (i.e. without modification of contents) through the network. SDUs are expected to be delivered, in sequence, with a high probability: and probability of misdelivery, mutilation and duplication is expected to be very low. Normally the network wi
14、ll not interpret or act upon this information. Service data units are transmitted after establishing the user signalling bearer service connection. (To send SDUs during the call setup or release phase may be a supplementary service such as user-to-user signalling service 1 and 2.) Service data units
15、 transmitted by this service are limited to 252 octets. As a network provider option, limitations may also be placed on the amount of data a user is permitted to transfer in a given time period (e.g. the throughput can be limited through use of explicit mechanisms, see Annex A). This service may be
16、provided either on demand or as a permanent service. This service is different from, and should not be confused with, the user-to-user signalling supplementary service (see Recommendation 1.257). The user-to-user supplementary service is used in conjunction with either a bearer service or a teleserv
17、ice. 2.2 Specific terminology For further study. 3 Procedures 3.1 Provisiodwithdrawai The service is normally provided on a subscription basis. However some networks may not require specific subscription to the USBS since it may be offered as a default for general ISDN subscription. 3.2 Normal proce
18、dures All user-network signalling is done on the D-channel. As a network option there may be a maximum allowable number of USBS calls present per D-channel. If so, this limit will define the network determined user busy condition for USBS. High layer functions are defined in Recommendation 1.210. Re
19、commendation 1.232.3 (03/93) 1 ITU-T RECMN*I=232- 3 93 m 4862593 0583799 170 I 3.2.1 Activatioddeactivatiodregistration For further study. 3.2.2 Demand service procedures a) Originating the service (call Set-up) The USBS call is originated by the user requesting from the network the required bearer
20、service and identifying the called user. Other information, as required, for the bearer service and for use by the network in supplementary services provided to the called user (e.g. calling line identity) may also be included. This request may be given to the network either en bloc, containing all
21、the required information, or not en bloc. b) Indications during call set-up After initiating a call, the calling user will receive an acknowledgement that the network is able to process the call. The called user will receive an indication of the arrival of an incoming call of this bearer service. Th
22、e calling user shall also receive an indication that the incoming call is being offered to the called user, when an indication is received by the network that the called user is being informed of this call. When the called user answers the call and the connection is established, an indication of thi
23、s is 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.g. connected line identity). The relationship of a connected user with the called user requires further study. c) Information transfer phase O
24、nce the connection is established, charging may begin (if charging has a time component) and service data units may be transferred in both directions simultaneously, without alteration by the network. No restriction is placed on the content of service data units, as long as their length does not exc
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ITUTI23231993USERSIGNALLINGBEARERSERVICECATEGORYUSBS 用户 承载 业务 种类 综合 服务 数字 网络 ISDN 能力 支持 研究 181 PDF

链接地址:http://www.mydoc123.com/p-798120.html