ITU-T G.212 (11 1988) (英) Hypothetical reference……

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1、INTERNATIONALTELECOMMUNICATIONUNION)45 4'TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU).4%2.!4)/.!,!.!,/'5%#!22)%23934%-3'%.%2!,#(!2!#4%2)34)#3#/--/.4/!,,!.!,/'5%#!22)%2 42!.3-)33)/.3934%-3(90/4(%4)#!,2%&%2%.#%#)2#5)43&/2!.!,/'5%

2、3934%-3)45 4Recommendation'(Extractfromthe"LUE"OOK)NOTES1ITU-TRecommendationG.212waspublishedinFascicleIII.2oftheBlueBook.ThisfileisanextractfromtheBlueBook.WhilethepresentationandlayoutofthetextmightbeslightlydifferentfromtheBlueBookversion,thec

3、ontentsofthefileareidenticaltotheBlueBookversionandcopyrightconditionsremainunchanged(seebelow).2InthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.ãITU1988,1993

4、Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.RecommendationG.212FascicleIII.2-Rec.G.212HYPOTHETICALREFERENCECIRCUITSFOR

5、ANALOGUESYSTEMSGENERALDEFINITIONS1hypotheticalreferencecircuitF:circuitfictifderéférenceS:circuitoficticiodereferenciaThisisahypotheticalcircuitofdefinedlengthandwithaspecifiednumberofterminalandintermediateequipments,thisnumberbeingsufficientbutnotexcessi

6、ve.Itformsabasisforthestudyofcertaincharacteristicsoflong-distancecircuits(noise,forexample).2hypotheticalreferencecircuitfortelephonyF:circuitfictifderéférencepourlatéléphonieS:circuitoficticiodereferenciaparalatelefoníaThisisacompletetelephonecircuit(bet

7、weenaudio-frequencyterminals)establishedonahypotheticalinternationaltelephonecarriersystemandhavingaspecifiedlengthandaspecifiednumberofmodulationsanddemodulationsofchannels,groups,supergroups,thesenumbersbeingreasonablygreatbutnothavingtheirmaximumpossibl

8、evalues.Thehypotheticalreferencecircuithastoreflectwhatisgenerallyexpectedtobethepracticalapplicationofthesystem.Varioushypotheticalreferencecircuitsfortelephonyhavebeendefinedtoallowthecoordinationofthediffe