User's Manual

Confidential&Proprietary102/115 SC‐DAS
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ROUOpticCompOperation
TheROUhasthefunctionofautomaticallycompensatingforopticalloss.Itcandotheworkforupto
5dBoofopticalloss.Set“TXOPTICCOMP”oftheMRUto"ON."OpticalcompensationofROUcan
notbemadewithoutcommunicationtotheODUorOEU.For1dBo ofoptical
loss,basic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ROUGUI.
LDPOWERreferencestheoutputlevelofROULaserDiodewhich
issenttoaupperunitbytheROU.
PDPOWERreferencestheinputlevelofPhotoDiodetobereceivedfromaupperunit.
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Figure6.12–OpticalinformationattheROU
Initially,WhentheROUcommunicateswiththeupperdevice(ODU/OEU),opticallosscompensation
isdoneautomatically.Duringopticallosscompensation,theresultwindowshows"Processing"and
thenaresultvalueisdisplayed.Therearethreetypesofresultsasfollows:
1. Success:Theopticalcompensation
isnormallycompleted.
2. OverOpticLoss:Generatedopticallossis5dBoormore.
3. CommunicationFail:CommunicationwithROUisinpoorcondition.
Continueif TXopticresultissuccessful. Ifthe resultsare“overopticLoss”,cleanopticalconnector
faceusingclearcloth,andthenoperateTXOPTICCOMP
again.
Also, you can perform optical loss compensationmanually. Here, RUN Modedisplays two types as
shownbelow
1. Auto:CPUofMRUisperformedautomaticallywheniscommnincatedwithupperdevice
2. Manual:whenuserperformsmanually.Thisresultwilldisplay
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 IfROUdoesnotmakeopticalcompensation,therewillbeerorsinthesystemlinkbudget.It
cancauseloweroutputlevelsormakeSpuriousEmissionsdetrimentaltothesystem.