User's Manual

FiberDistributedAntennaSystem(FiberDAS)
47
BIU
TheBIUservesastheRFinterfacebetweentheRFsourceandtheICU/FOI.EachBIUispre‐settoafrequencyband
andisnotfieldtunable.
TheBIUhastw
osetsofRFsourceconnections.Theunitscanaccepttwoindependentfeeds(withinthesameband).
ThefeedscanbefromseparatesourcesorAandBpathsinaMIMOconfiguration.
Duetothehighlev
elofRFcomingintoBIU,useonlyqualityRFcables.
Figure 34 BIU Connections
RF
Source
ICU
or
FOI
 InstalltheBIUintheMasterUnit.TheBIUusestwoslotsintheMasterUnit.
Note: TheUL1andUL2uplinktestpo
rtsare3dBlowerthanthesignalonthecorrespondingDL/UL
BTSport.
 ConnectSMAtotheRFsource.Tightento8in‐pounds(0.9N‐m)withacalibratedtorquewrench.
 ConnectQMAtotheICU/FOI.
CAUTION
Over
drivingtheRFsourceinputintotheBIUwillcausepermanentequipmentfailureandwillvoidthewarranty.
Theinstallermustensurethatinputlevelsarenote x ceeded.PlanformaximumpoweroutoftheRFsourceand
attenuateaccordinglywithexternalattenuatorsifneeded.
BIU Type Minimum DL Input Maximum DL Input
LowLevel ‐7dBm +7dBm
HighLevel +20dBm +33dBm
CAUTION
WhenmatingRFconnectors,ensurethattheyareproperlyalignedandnotcrossthreaded.
TightenSMAconnectorsto8in.‐lbs(0.9N‐m).
DoovertorqueRFconnectors,thiscouldresultindamagetotheUnit.
DonotundertorqueRFconnectors,thiscouldresultinpoorsignaltransmission.
CAUTION
Excesstensiononth
ecab
leorconnectorsmaycausePIMissues.
Cablesmustbesecuredintherackwithoutapplyingtensiontotheconnectors.