User's Manual

Confidential&Proprietary90/115 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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