User's Manual

Confidential&Proprietary95/122 SC‐DAS
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This chapter describes operation of SC‐DAS. It deals with procedures and operations for normal
systemoperationafterinstallation.Italsodescribesoperationsperunitandinterworkingmethods.
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6.1  BIUOverview
6.1.1 BIU
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Figure6.1–SC‐DASLinkbudgetfortheBIU
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6.1.2 BIUTXparameters
TheTXleveltobesenttotheBIUshouldbeintherangeof‐20dBmto+10dBm.Ifthelevelexceeds
therange,youneedtoconnectanattenuatortothefrontendoftheBIUinputandadjustthelevelin
thecorrespondingrange.IfTXinputistoolow,maximumpowercannotbeachievedsoyouneedto
increasetheoutputpowerofBDAoradjustattenuationamountofBTS’scoupleradjustthelevelof
theATT.
Using a spectrum analyzer, check all bands and verify if they are in an appropriate level before
makingconnectionwithinputportoftheBIU.Last,checktoseeiftherearespurioussignals.
SelectanMDBUwiththedesiredfrequency bandsand .insert itintothe BIUand checktoseeifit
works normally. For the MDBU, up to two TX inputs are provided. Input level per port is‐20dBm
to+10dBm.
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