User's Manual

Confidential&Proprietary115/122 SC‐DAS
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Red:OEUsystemabnormal(alarm)
CheckingCommunicationLEDofOEU
Step1:checkingwhetherthereiscommunicationwiththeBIU(ODU)
CheckifTXD1andRXD2LEDsinOEUfrontLEDmakecommunication.ReceivingFSKsignalsfromBIU,
the OEU sends requested status value to BIU. During reception, RXD1 LED flicks. During
tramsmissionTXD1LEDflicks.
Step2:CheckingwhetherthereiscommunicationwiththeROU
OEUconfiguredasaHub.OEUhastwoopticalports.OneisconnectedtoupperODUandtheothers
isconnectedtoROU.CommunicationwithODUwascheckedatabovestep1
Step 3 is checking whether the OEU communicates with the ROU. The OEU request status to the
ROUandthenTXD2blinksIfresponesdataisreceivedfromROU,RXD2LEDblinks
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OEUOpticCompOperation
TheOEUhasthefunctionofautomaticallycompensatingforopticalcalbeloss.Itcandotheworkfor
upto5dBoofopticalloss.Set“TXOPTIC COMP”of OEU’sopticas"ON."Optical compensationof
theOEUcannotbemadewithoutcommunicationwiththeODU.For1dBoofopticalloss,TXOPTIC
ATTis1dB;for5dBoofopticalloss,TXOPTICATTis4dB.OPTICCOMPworksonlyonetimebeforeit
staysdormant.
ThefigurebelowshowsascreenforOPTICInformationintheOEUGUI.
LDPOWERreferencestheoutputlevelofOEULaserDiode,whichissenttoaupperunitbytheOEU.
PDPOWERreferencestheinputlevelofPhotoDiodetobereceivedfromaupperunit.
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Figure6.17–OEUOpticalinformation
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