ITU-T G.176 (04 1997) (英) Planning guidelines for

INTERNATIONALTELECOMMUNICATIONUNION)454'TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU(04/97)SERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSInternationaltelephoneconnectionsandcircuits–Transmissionplanaspectsofspecialcircuitsandconnectionsusingtheinternationaltelephoneconnectionnetwork0LANNINGGUIDELINESFORTHEINTEGRATIONOF!4-TECHNOLOGYINTONETWORKSSUPPORTINGVOICEBANDSERVICESITU-TRecommendationG.176(PreviouslyCCITTRecommendation)ITU-TG-SERIESRECOMMENDATIONS42!.3-)33)/.3934%-3!.$-%$)!$)')4!,3934%-3!.$.%47/2+3Forfurtherdetails,pleaserefertoITU-TListofRecommendations.INTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199GeneraldefinitionsG.100–G.109GeneralRecommendationsonthetransmissionqualityforanentireinternationaltelephoneconnectionG.110–G.119GeneralcharacteristicsofnationalsystemsformingpartofinternationalconnectionsG.120–G.129Generalcharacteristicsofthe4-wirechainformedbytheinternationalcircuitsandnationalextensioncircuitsG.130–G.139Generalcharacteristicsofthe4-wirechainofinternationalcircuits;internationaltransitG.140–G.149GeneralcharacteristicsofinternationaltelephonecircuitsandnationalextensioncircuitsG.150–G.159Apparatusassociatedwithlong-distancetelephonecircuitsG.160–G.1694RANSMISSIONPLANASPECTSOFSPECIALCIRCUITSANDCONNECTIONSUSINGTHEINTERNATIONALTELEPHONECONNECTIONNETWORK''ProtectionandrestorationoftransmissionsystemsG.180–G.189SoftwaretoolsfortransmissionsystemsG.190–G.199).4%2.!4)/.!,!.!,/'5%#!22)%23934%-GENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-TRANSMISSIONSYSTEMSG.200–G.299INDIVIDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSONMETALLICLINESG.300–G.399GENERALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINESG.400–G.449COORDINATIONOFRADIOTELEPHONYANDLINETELEPHONYG.450–G.49942!.3-)33)/.-%$)!#(!2!#4%2)34)#3$)')4!,42!.3-)33)/.3934%-3TERMINALEQUIPMENTSG.700–G.799DIGITALNETWORKSG.800–G.899DIGITALSECTIONSANDDIGITALLINESYSTEMG.900–G.999ITU-TRECOMMENDATIONG.176PLANNINGGUIDELINESFORTHEINTEGRATIONOFATMTECHNOLOGYINTONETWORKSSUPPORTINGVOICEBANDSERVICESSummaryThisRecommendationprovidestransmissionperformanceplanningguidancetonetworkandserviceplannerswhoareresponsiblefortheintegrationofATMtechnology,e.g.digitalprocessingequipment,multiplexers,andswitches,intothePSTN.ThisRecommendationrecognizesandaddresses:theinterconnectionofothernetworks,e.g.PrivateNetworksandDigitalCellularNetworks,withthePSTN,andthecontinuedneedtosupportexistingvoicebandservices.SourceITU-TRecommendationG.176waspreparedbyITU-TStudyGroup12(1997-2000)andwasapprovedundertheWTSCResolutionNo.1procedureonthe18thofApril1997.iiRecommendationG.176(04/97)FOREWORDITU(InternationalTelecommunicationUnion)istheUnitedNationsSpecializedAgencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganoftheITU.TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationConference(WTSC),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMembersoftheITU-TiscoveredbytheprocedurelaiddowninWTSCResolutionNo.1.InsomeareasofinformationtechnologywhichfallwithinITU-T’spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendation,theexpressionAdministrationisusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.INTELLECTUALPROPERTYRIGHTSTheITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.TheITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.AsofthedateofapprovalofthisRecommendation,theITUhad/hadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementorsarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabase.ITU1997Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.RecommendationG.176(04/97)iiiCONTENTSPage1Preamble.....................................................................................................................12Scope...........................................................................................................................13Normativereferences..................................................................................................14Termsanddefinitions.................................................................................................25Abbreviations..