User Manual

FiberDistributedAntennaSystem(FiberDAS)
35
Full system example
HereisanexampleofafullsystemshowingtheMasterUnitandthefibersthatgoesofftotheRemoteUnits(not
showninthisexample)withmultipleoperatorsandalargenumberoffrequencybands.
Figure 17
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Full System Connection Diagram
Block1:Hereareall theBaseStationInterfaceUnits(BIU)cardsforallthefrequencybandsandtheoperators.Inthis
exampletwooperatorsmayshareoneBIU.Thefirstunit1:1isforFMradiowhichisonlyDownlinkasitisbroadcast.
Thesecondunit1:2isforasaf
etybluelightserviceusingtheTETRAsystemon400MHz.ThentherearetwoBIU’s
1:3and1:4forGSM900,similarforGSM1800andforUMTS2100andLTE2600.
Block2:ThisisthePo
intofInterconnect(POI)whereallthesignalsfromtheoperatorsarecombinedonthefour
couplingfieldsofthefirstPOI(2:1).TherearetwoULfieldsandtwoDLfields.Thecommonportsarethenfedintoa
hybridcombiner(2:3,2:4)andontothesec
ondPOI(2:2)wherethesignalsaresplituptoconnecttoalltheFiber‐
opticInterfaces.
Block3:The
searethefiber‐opticinterfaces(FOI)andinthisexampleupto16FOIcardsmaybeconnectedforatotal
of16RemoteUnitsifthereareoneRemoteUnitperfi ber.ItispossibletouseuptofourRemoteUnitsonasingle
fiber.
Block4‐6:The
searesupportingunitssuchaspowersupplies,theBGWwhichisthealarmandcontrolcomputerin
thesystemandtheEthernetSwitchthatconnectsthecommunicationbetweenallunitsintheMasterUnitandalso
handlesthecommunicationswiththeRemoteUnits.