WhatisoneoftheprimaryoverheadfieldsassociatedwiththeOpticalPayloadUnit(OPU)?()

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A.pathmonitoring

B.tandemconnectionmonitoringactivationdeactivation(TCMACT)

C.PayloadStructureIdentifier(PSI)

D.multiframealignmentsignal(MFAS)

E.sectionmonitoring

参考答案:

参考C

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