单项选择题

Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS－1 timing source?（）

A.DUS
B.line
C.loop
D.internal
E.through

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单项选择题

由音级F向上构成变化半音，选项正确的是： A. #F B. bF C. bG D. #G

单项选择题

Thedispersionofanon-zerodispersionshiftedfiberis6ps nm*kmat1550nmand10ps nm*kmat1610nm.WhatistheminimumdispersioncompensationrequiredifanL-BandDWDMsignaltravelsthrough200kmoffiberandhasadispersiontoleranceof1800ps nm？（）A.noneB.-600ps nmC.-200ps nmD.+200ps nmE.+600ps nm

A.WhatistheminimumdispersioncompensationrequiredifanL-BandDWDMsignaltravelsthrough200kmoffiberandhasadispersiontoleranceof1800ps/nm？（）
A.none
B.-600ps/nm
C.-200ps/nm
D.+200ps/nm
E.+600ps/nm

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