ITU-TG.981(011994)(英)PDHopticallinesystemsforthelocalnetwork.pdf

《ITU-TG.981(011994)(英)PDHopticallinesystemsforthelocalnetwork.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、INTERNATIONALTELECOMMUNICATIONUNION)45 4'TELECOMMUNICATION(01/94)STANDARDIZATIONSECTOROFITU$)')4!,3%#4)/.3!.$$)')4!,,).%3934%-30$(/04)#!,,).%3934%-3&/24(%,/#!,.%47/2+)45 4Recommendation'(Previously“CCITTRecommendation”)

2、FOREWORDTheITU-T(TelecommunicationStandardizationSector)isapermanentorganoftheInternationalTelecommunicationUnion(ITU).TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommen-dationsonthemwithaviewtostandardizingtelecom

3、municationsonaworldwidebasis.TheWorldTelecommunicationStandardizationConference(WTSC),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMemb

4、ersoftheITU-TiscoveredbytheprocedurelaiddowninWTSCResolutionNo.1(Helsinki,March1-12,1993).ITU-TRecommendationG.981waspreparedbyITU-TStudyGroup15(1993-1996)andwasapprovedundertheWTSCResolutionNo.1procedureonthe20thofJanuary1994.___________________NOTEI

5、nthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.ãITU1994Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronic

6、ormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.CONTENTSRecommendationG.981(01/94)Page1General.........................................................................................................................

7、..................................11.1Scope................................................................................................................................................11.2Objectives..................................................

8、.......................................................................................11.3Definitions........................................................................................................................................11.4A