CCITT F.30(11-1988) (英) Use of various sequences of……

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1、INTERNATIONALTELECOMMUNICATIONUNIONCCITTF.30THEINTERNATIONAL(11/1988)TELEGRAPHANDTELEPHONECONSULTATIVECOMMITTEESERIESF:NON-TELEPHONETELECOMMUNICATIONSERVICESTelegraphandMobileServices:OperationsandQualityofService–MessageswitchingUSEOFVARIOUSSEQUENCESOFCOMBINATIONSFORSPECI

2、ALPURPOSESReeditionofCCITTRecommendationF.30publishedintheBlueBook,FascicleII.4(1988)NOTES1CCITTRecommendationF.30waspublishedinFascicleII.4oftheBlueBook.ThisfileisanextractfromtheBlueBook.WhilethepresentationandlayoutofthetextmightbeslightlydifferentfromtheBlueBookversion

3、,thecontentsofthefileareidenticaltotheBlueBookversionandcopyrightconditionsremainunchanged(seebelow).2InthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.©ITU1988,2007Allrightsres

4、erved.Nopartofthispublicationmaybereproduced,byanymeanswhatsoever,withoutthepriorwrittenpermissionofITU.RecommendationF.30USEOFVARIOUSSEQUENCESOFCOMBINATIONSFORSPECIALPURPOSESTheCCITT,unanimouslydeclaresthat(1)whenitisnecessarytoprovideforswitchingoftelegramstodifferentrou

5、tesinsemi-automaticorfullyautomatictelegramretransmissionsystems,thebeginningandendingofeachtelegramareidentifiedbytheinsertionofstart-of-messageandend-of-messagesignals;(2)thestart-of-messagesignalconsistsofthesequenceZCZCinlettercase;(3)theend-of-messagesignalconsistsoft

6、hesequenceNNNN,inlettercase;(4)theequipmentthatrecognizesthestart-of-messageandend-of-messagesignalsmaybedesignedtodosobysearchingonlyforthesequenceoffourcombinationscorrespondingtoZCZCorNNNNrespectively(i.e.combinations26,3,26,3or14,14,14,14inInternationalTelegraphAlphabe

7、tNo.2regardlessofwhethertheyareinletterorfigurecase);(5)Table1/F.30listsothersequencesofcombinationsusedforspecialpurposes.TABLE1/F.30PrintedpositionSequenceofRecommendationPurposeofsequencecombinationreferenceLettercaseFigurecaseConnectionofreperforator3333CCCC::::S.4(ore

8、quivalentdevice)Disconnectionofreperforator6666FFFFNote1S.4(orequivalentdevice)Suppressio