User Manual

4
Chapter 2 System Description
TheFiber‐DASsystemconsistsoftwomajorparts.ThisistheMasterUnit(MU)andoneormoreRemoteUnits(RU)
connectedtotheMasterUnitviaopticalfibers.EachRemoteUnitneedstobeconnectedtoafiber,butuptofour
RU’scanshareasinglefiberlinkusi
ngopticalsplitters.
Master Unit
TheMasterUnitconsistsofa19‐inchrackwithmodulesthatareselecteddependingonthesystemdesign.
GenerallyallMasterUnitscontain:
Po
wersupply
,AtleastoneBaseStationInterfaceUnit(BIU)
AtleastoneFiber‐OpticInterfacecard(FOI)
PointofInterconnect(POI)
Networkswit ch‐connectscommunicationspathsbetweenthemodules
RemoteGatewayUnit(RGW)ortheBaseStationGatewayUnit(BGW)‐RGWisasmallercompact
embeddedsolutionwhiletheBG
WisafullfeaturedLinuxserverthatcanbesetupinmanydifferent
ways
Thema
sterunitwillassignIPaddressestoallthesubunitsintherackandalsofortheRemoteUnitswhentheyare
connectedtothesystemviathebuildinDHCPserverpresentintheRGWandBGWmodules.Thisiswillconfigure
itselfautomaticallyandcreateaprotectedsub‐ne
tforthesystemitselfthatshouldnotbeconnecteddirectlytoa
LAN.
Forre
motesupervisionagateway(RGWorBGW)isinstalled.Thegatewayactsasafirewallandwillmakesurethat
theinternaltrafficinthesystemstaysinternalandthatthewebinterfaceformonitoringandsupervisionaswellas
SNMPtrapforwardishandledasexpecte d.
Eachofthemodule
swillbedescribedinthefollowingsections.
Master Frame Unit (MFU)
TheMasterFrameUnit(MFU)housesthePowerSupplies,FOIcardsandBIUs. Figure1 showsanMFUequipped
with3BIU
s,6FOIsandonePowerSupply.
Figure 1 Master Frame Unit