单项选择题

Inopticaltransmissionsystems，chirpedlasersareusedforthepurposeof：（）.

A.TurningthelasertoaspecificITUchannel
B.Keepingthesignalwavelength"locked"toaspecifictechnology
C.SuppressingFWMandSBSnon-lineareffects
D.Noneoftheabove

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单项选择题

WhatdoesUDLDstandfor？（）

A.UniDirectionalLoopDetection
B.UnspecifiedDistributionLabelDetection
C.UnifiedDistributionLabelDirection
D.UniDirectionalLinkDetection

单项选择题

WhichstatementsistrueaboutForeignExchangeStation（FXS）portsonarouter？（）

A.theFXSinterfaceallowsananalogconnectiontobedirectedatthepublicswitchedtelephonenetwork（PSTN’s）centraloffice
B.theFXSinterfaceconnectdirectlytoastandardtelephone，faxmachine，orsililardeviceandsuppliesring，voltage，anddialtone
C.theFXSinterfaceconnectdirectlytoanIPphoneandsuppliesring，voltage，anddialtone
D.theFXSinterfaceconnectdirectlytoISDNvoicechannels