1、INTERNATIONAL TELECOMMUNICATION UNIONITU-T Series E.800TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITUSupplement 7(11/1988)SERIES E: OVERALL NETWORK OPERATION,TELEPHONE SERVICE, SERVICE OPERATION ANDHUMAN FACTORSTelephone network management and traffic engineeringGuide for evaluating and implementing
2、alternaterouting networksITU-T E.800-series Recommendations Supplement 7(Formerly CCITT Recommendations)ITU-T E-SERIES RECOMMENDATIONSOVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMANFACTORSINTERNATIONAL OPERATIONDefinitions E.100E.103General provisions concerning Administrat
3、ions E.104E.119General provisions concerning users E.120E.139Operation of international telephone services E.140E.159Numbering plan of the international telephone service E.160E.169International routing plan E.170E.179Tones in national signalling systems E.180E.189Numbering plan of the international
4、 telephone service E.190E.199Maritime mobile service and public land mobile service E.200E.229OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN THEINTERNATIONAL TELEPHONE SERVICECharging in the international telephone service E.230E.249Measuring and recording call durations for accountin
5、g purposes E.260E.269UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON-TELEPHONY APPLICATIONSGeneral E.300E.319Phototelegraphy E.320E.329ISDN PROVISIONS CONCERNING USERS E.330E.349INTERNATIONAL ROUTING PLAN E.350E.399NETWORK MANAGEMENTInternational service statistics E.400E.409International
6、 network management E.410E.419Checking the quality of the international telephone service E.420E.489TRAFFIC ENGINEERINGMeasurement and recording of traffic E.490E.505Forecasting of traffic E.506E.509Determination of the number of circuits in manual operation E.510E.519Determination of the number of
7、circuits in automatic and semi-automatic operation E.520E.539Grade of service E.540E.599Definitions E.600E.649Traffic engineering for IP-networks E.650E.699ISDN traffic engineering E.700E.749Mobile network traffic engineering E.750E.799QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS,OBJECTIV
8、ES AND DEPENDABILITY PLANNINGTerms and definitions related to the quality of telecommunication services E.800E.809Models for telecommunication services E.810E.844Objectives for quality of service and related concepts of telecommunication services E.845E.859Use of quality of service objectives for pl
9、anning of telecommunication networks E.860E.879Field data collection and evaluation on the performance of equipment, networks and services E.880E.899For further details, please refer to the list of ITU-T Recommendations.E.800 series Supplement 7 (11/1988) iSupplement 7 to ITU-T E.800-series Recommen
10、dationsGuide for evaluating and implementing alternate routing networksSummaryThis guide describes a systematic procedure in several steps used for the evaluation of alternate routing networks.SourceSupplement 7 was approved in Melbourne (1988) and originally published in Blue Book, Fascicle II.3.ii
11、 E.800 series Supplement 7 (11/1988)FOREWORDThe International Telecommunication Union (ITU) is the United Nations specialized agency in the field oftelecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ ofITU. ITU-T is responsible for studying technical, op
12、erating and tariff questions and issuingRecommendations on them with a view to standardizing telecommunications on a worldwide basis.The World Telecommunication Standardization Conference (WTSC), which meets every four years,establishes the topics for study by the ITU-T study groups which, in turn,
13、produce Recommendations onthese topics.The approval of ITU-T Recommendations is covered by the procedure laid down in WTSC Resolution 1.In some areas of information technology which fall within ITU-Ts purview, the necessary standards areprepared on a collaborative basis with ISO and IEC.NOTEIn this
14、publication, the expression “Administration“ is used for conciseness to indicate both atelecommunication administration and a recognized operating agency.INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this publication may involve theuse of
15、a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity orapplicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside ofthe publication development process.As of the date of approval of this publication, ITU had not
16、received notice of intellectual property, protectedby patents, which may be required to implement this publication. However, implementors are cautioned thatthis may not represent the latest information and are therefore strongly urged to consult the TSB patentdatabase. ITU 2002All rights reserved. N
17、o part of this publication may be reproduced, by any means whatsoever, without theprior written permission of ITU.E.800 series Supplement 7 (11/1988) iiiCONTENTSPage1 Identification of alternate route 12 Preliminary screening. 13 Data gathering 14 Evaluation. 15 Implementation. 26 Monitoring 2ANNEX
18、A Flowchart of evaluation and implementation procedure for alternate routing networks 2E.800 series Supplement 7 (11/1988) 1Supplement 7 to ITU-T E.800-series RecommendationsGuide for evaluating and implementing alternate routing networksA systematic procedure consisting of a number of distinct step
19、s is used for the evaluation of alternate routingnetworks.These steps are given in the flowchart of Annex A and are provided as guidance. Administrations may wish toexpand, delete or change the order of these steps to meet circumstances.The steps may be grouped into the following six processes: Iden
20、tification of alternate route. Preliminary screening. Data gathering. Evaluation. Implementation. Monitoring.1 Identification of alternate routeA terminal Administration selects an alternate route.A tentative agreement is reached with the opposite terminal Administration to use the selected alternat
21、e route,and both terminal Administrations reach tentative agreement with the transit Administration to explore the use of itsnetwork as an alternate route.If no tentative agreements are reached, another alternate route is selected or if none is available, the procedureis abandoned.2 Preliminary scre
22、eningUsing available data, the organizational elements of the terminal Administrations responsible for transmission,routing and call completion, analyse the feasibility of utilizing the alternate route.If an objection is raised, another alternate route is selected or, if none is available, the proce
23、dure is abandoned.3 Data gatheringA questionnaire is issued to all Administrations involved to obtain additional information before an evaluationis made of the proposed alternate route.The questionnaire can include requests for transmission, routing, call completion rates, traffic profiles, circuitc
24、osts, and transit charges.If there is no response to the questionnaire or if the information provided indicates that the alternate route isunsuitable, another alternate route is selected or, if none is available, the procedure is abandoned.4 EvaluationThe alternate routing network is dimensioned acc
25、ording to Recommendation E.522.If additional circuits are required on the alternate route, and the required increment exceeds the availablecapacity, another alternate route is selected. If no other alternate route is available Administrations may choose to retainthe selected alternate route and acce
26、pt a cost disadvantage.2 E.800 series Supplement 7 (11/1988)5 ImplementationFinal negotiations are carried out and approval of all Administrations involved in the alternate route network issought.The negotiations would include the reporting procedure and responsibility for recording traffic overflow
27、ing tothe alternate route.If final agreement cannot be reached, another alternate route is selected or, if none is available, the procedure isabandoned.6 MonitoringTraffic volumes and performance data for the alternate route are recorded and exchanged at regular intervals.ANNEX A(to Supplement No. 7
28、)Flowchart of evaluation and implementation procedure for alternate routing networksT0209470-02CABFinal circuit groupTransit AdministrationFinal circuit groupHigh usage circuit groupAdministration AdministrationFIGURE A-1Alternate routing networkE.800 series Supplement 7 (11/1988) 3T0209480-02Step 1
29、Proposed alternate routeStep 2Preliminary check of transmission,routing and call completionStep 3Does proposed alternateroute have possibilities ?Step 5Issue questionnaire to allentities involved inalternate routeStep 6Is A-B-C completion rate A-Bcompletion rate minus x %?a)Step 4Is there another A-
30、B-C route ?EndNoYesYesStep 7Is there another A-B-C route ?EndNoStep 8Data gatheringStep 9Dimension minimum cost/outlay networkYesNoStep 10Additional circuits required ?Step 14Negotiate agreement forconclusive alternate routeStep 15Approved by all Administrationsinvolved ?Step 16Establish implementio
31、n dateStep 17Ensure implementation ofalternate routeStep 18Monitor alternate route,provide required data andquality reports and re-evaluatealternate route as requiredStep 11Sufficient capacity availableon alternate route ?Step 12Some spare capacity onalternate route ?Step 13Agree to accept costdisad
32、vantage ?NoNoNoYesYesYesNoNoYesYes24-hourstraffic profilesTrafficdemandsCost of equipmentand facilitiesTransitaccounting ratesNoa)x is a parameter to be specified among the involved Administrations.NOTE Flowchart uses configuration of figure A-1.YesFIGURE A-2Flowchart for evaluating and implementing
33、alternate routing networksPrintedinSwitzerlandGeneva, 2002SERIES OF ITU-T RECOMMENDATIONSSeries A Organization of the work of ITU-TSeries B Means of expression: definitions, symbols, classificationSeries C General telecommunication statisticsSeries D General tariff principlesSeries E Overall network
34、 operation, telephone service, service operation and human factorsSeries F Non-telephone telecommunication servicesSeries G Transmission systems and media, digital systems and networksSeries H Audiovisual and multimedia systemsSeries I Integrated services digital networkSeries J Cable networks and t
35、ransmission of television, sound programme and other multimedia signalsSeries K Protection against interferenceSeries L Construction, installation and protection of cables and other elements of outside plantSeries M TMN and network maintenance: international transmission systems, telephone circuits,
36、telegraphy, facsimile and leased circuitsSeries N Maintenance: international sound programme and television transmission circuitsSeries O Specifications of measuring equipmentSeries P Telephone transmission quality, telephone installations, local line networksSeries Q Switching and signallingSeries
37、R Telegraph transmissionSeries S Telegraph services terminal equipmentSeries T Terminals for telematic servicesSeries U Telegraph switchingSeries V Data communication over the telephone networkSeries X Data networks and open system communicationsSeries Y Global information infrastructure and Internet protocol aspectsSeries Z Languages and general software aspects for telecommunication systems*21964*
