User's Manual

4
Chapter 2 System Description
TheFiber‐DASsystemtypicallyconsistsofthreemainsegments:
Gateway — TheGatewayact
sasafirewallensuringinternaltrafficonthesystemremainsinternalandatthesame
timeallowingawebinterfaceformonitoringandsupe rvision.ThegatewayalsohandlesSNMPtraps.
Headend — TheHeadendserv
esastheinterfacewiththeoperator’sbasestation,housingtheunitsrequiredto
transmitandreceivecommunicationsbetweentheoperator’sbasestationandtheremoteunitsoftheFiber‐DAS
system.
Remote Units — theremoteuni
tsarelocatednearthedistributedantennasandhousetheequipmentnecessary
totransmitandreceivecommunicationsbetweentheantennaandtheheadend.
Figure 1
Remote
Unit
Remote
Unit
Remote
Unit
Head End
Gateway
Central
Gateway
Ethernet
Switch
Master
Frame
Unit
Master
Frame
Unit
Master
Frame
Unit
(BGW/RGW)
Fiber-DAS System
Gateways
ThegatewaysofferedincludetheCentralGateway(CGW),BaseStationGateway(BGW)andRemoteGateway
(RGW).
Forremotesuper
visionofaFiber‐DASagateway(RGWorBGW)isinstalled.BGWsandRGWsaretypicallylocated 
withtheheadendequipment,theRGWisasmallercompactembeddedsolutionwhiletheBGWisafullfeatured
Linuxserverthatcanbesetupinmanydifferentways.
CGWsar
eus
edformonitoringmultipleFiber‐DASsystems,communicatingwiththeBGWsandRGW s.
Central Gateway (CGW)
TheCGWisusedtoprovideasingleremoteaccesspointandtocompilealarmsfrommultipleBGW/RGWnetworks.
Theunitisaself‐poweredLinuxbasedserver.
Base Station Gateway (BGW)
TheBGWassignsIPaddressestoallthemodulesintheFiber‐DASsystem,includingtheHeadendandRemoteUnits
aswellastheircomponents.
TheBGWisasel
f‐poweredLinuxbasedserver.
FeaturesoftheBGW:
Webin
terfaceconfiguration
Automaticdetectionofmodules
AutomaticdetectionofRemoteUnits
Capableofhandlinglargesystems
Functionsforstatistics