1、CCITT D.ll THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE GENERAL TARIFF PRINCIPLES CHARGING AND ACCOUNTING IN INTERNATIONAL TELECOMMUNICATIONS SERVICES SPECIAL TARIFF PRINCIPLES FOR DATA COMMUNICATION SERVICES BY MEANS OF THE VIRTUAL CALL FACILITY INTERNATIONAL PACKET-SWITCHED PUB
2、LIC Recommendation D.ll Geneva, 1991 CCITT RECMN*D*LL 91 m 48b2.592 0.560526 2 m INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE GENERAL TARIFF PRINCIPLES CHARGING AND ACCOUNTING IN INTERNATIONAL TELECOMMUNICATIONS SERVICES D.11 SPECIAL TA
3、RIFF PRINCIPLES FOR DATA COMMUNICATION SERVICES BY MEANS OF THE VIRTUAL CALL FACILITY INTERNATIONAL PACKET-SWITCHED PUBLIC Recommendation D.ll Geneva, 1991 CCITT RECMN*D.LL 71 = 4862591 0560527 4 FOREWORD The CCIIT (the International Telegraph and Telephone Consultative Committee) is a permanent org
4、an of the Intemational Telecommunication Union (ITU). CCIT is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCITT which meets every four years, estab
5、lishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between Plenary Assemblies is covered by the procedure laid down in CCIT Resolution No. 2 (Melbourne, 1988). Recommendation D.ll was prepared by Study Group
6、III and was approved under the Resolution No. 2 procedure on the 22 of March 199 1. CCIT NOTE In this Recommendation, the expression Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. O ITU 1991 All rights reserved.
7、No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. CCITT RECMN*D*LL 91 a 4862571 0560528 b Recommendation D.ll SPECIAL TARIFF PRINCIPLES FOR INTERNATIONAL P
8、ACKET-SWITCHED PUBLIC DATA COMMUNICATION SERVICES BY MEANS Preamble OF THE VIRTUAL CALL FACILITY (Geneva, 1980, revised 1990) This Recommendation, whic should be applied in conjunction with . e provisions of Recommen- dation D. 10, sets out the special tariff principles intended for application to t
9、he international packet-switched public data communication service by means of the virtual call facility. Since this is a rapidly developing field at the present time in terms of the diversity of application, flexibility is essential. 1 Definition virtual call (switched connection) One service of th
10、e packet switched data transmission se rices in which a call Set-up procedure and a call clearing procedure will determine a period of communication bctween two DTEs, during which users dala will be transferred in the network in the packet mode of operation. All the users data are delivered from the
11、 network in the same order in which they are received by the nelwork. 2 Principles for the application of charges 2.1 Chargeable calls The following virtual calls are chargeable: i) a call request for which the outgoing data switching exchange (DSE) sends to the calling DTE the call- connected packe
12、t after it receives the call-accepted packet from the called DTE (see the diagram in Figure 1/D. 1 1); ii) a call request which is cut off before the call-connected packet from the remote DSE is received by the local DSE, owing to one of the following reasons: a) one of the DTEs sends a clear reques
13、t packet: b) c) remote procedure error of the DTE; local procedure error of the DTE. 2.2 unsuccessful call attempt is due to congestion or a fault in the Administrations equipment. Administrations reserve the right to apply a charge to all call attempts. This charge should not apply if an 3 Tariff c
14、omponents 3.1 The tariff for the service should consist of the following components: - the network access component, - the network utilization component. Recommendation D.11 1 CCITT RECNN*D.LL 91 986259L 0560529 M 3.2 Network access component 3.2.1 utilization. They may consist of: Access charges sh
15、ould be levied for each subscription and should normally be independent of network a) an initial fee (non-recurring); b) a subscription rental (payable at certain intervals, e.g. monthly, or quarterly, until the subscription is terminated). Different access charges may apply for access from other pu
16、blic-switched networks, e.g. from the public The access charges shall not be included in intemational accounts between Administrations and their 3.2.2 telephone network to the packet-switched data network. 3.2.3 establishment is strictly a national matter. 3.3 Nerwork utilization component 3.3.1 The
17、 charges relating to the network utilization component should be proportional to the volume of information transmitted and to the duration of communication and should be calculated in accordance with the methods prescribed in 4 3.3.2 and 3.3.3 below. 3.3.2 The volume of information transmitted shoul
18、d be measured and expressed in conformity with Recommendation D. 12. 3.3.2.1 Any chargeable packet other than the data packet should be considered as a packet for which a chargc corresponding to a segment is levied. 3.3.2.2 The following packets are chargeable) : - datapacket; - interrupt packet; -
19、call request/call incoming packet; - reset requesvreset indication packet, provided the cause of call reset is either DTE originated, local procedure error or remote procedure error; - clear request (when the fast select facility is signalled in the call request packet without restrictions). The cha
20、rgeable duration of a communication should be calculated on the basis of the information below. The duration of communication (see the diagram in Figure l/D.ll) should be measured and expressed in The duration of the communication should be the interval between: - 3.3.3 3.3.3.1 terms of a unit being
21、 equal to one minute. 3.3.3.2 the moment when the call-connected packet or the call-accepted packet is sent or received by the charging DSE2) where the recording of the duration takes place; and the moment when the clear request packet or the clear indication packet is received or sent by the chargi
22、ng DSE. If the duration of communication thus obtained contains a fraction of a minute, it should be rounded up to the For a chargeable call as provided in 0 2.1 ii) above, Administrations may apply a duration charge equal to - 3.3.3.3 next whole minute. 3.3.3.4 one unit in addition to the charge in
23、 accordance with 5 3.3.2.1. ) Further study to complete the list of chargeable caiis and chargeable packets for international services may be required. 2, The charging Administration should,in principle, obtain the information required for charging purposes. Therefore, in the case of a call using th
24、e reverse charging facility, it is the called Administration which is responsible for obtaining charging information. 2 Recommendation D. 11 CCITT RECMN*D*11 91 M 4862571 0560530 4 W 4 International accounts Accounting rates should be determined on the basis of either: i) ii) volume of information t
25、ransmitted, or volume of information transmitted and duration of communication. Charging Charging DSE DSE Calling (normal (reverse Called DTE charging) charging) DTE 4- Call request packet Incoming call packet 4 -+- - - Starting moment (see Table 1) Callaccepted packet Call connected packet Case (11
26、 Case (21 (Exchange of data packets, etc.) I I I I I I I I Ending moment (call cleared by the Table calling 2 DTE) -see n%-*-;L, Clear request packet Ending moment (call , Case (A) Case (CI Clear indication packet I I cleared by the called , I or I I DTEI -see Table 2 I I I I DTE Data terminal equipment DSE Data switching exchange TABLE 1 Starting moment TABLE 2 Ending moment charging by the calling DTE The call is cleared by the called DTE FIGURE 1/D.11 Diagrams illustrating the starting and ending moments of tlie chargeable duration Recommendation D.ll 3
