User's Manual Part 1

FiberDistributedAntennaSystem(FiberDAS)
9
TheBIUhasfourQMAports(femaletype)thatarenormallyusedtoconnectittoanICU.
 Therearetwouplink(input)portsandtwodownlink(output,TX)ports.
 Thesearetwoseparatepaths,theisolationbetweenDL1andDL2portsandtheisolationbetweentheUL
1andUL2portsis>50dB.
Therear
etwoseparateRFpathsintheBIU.TheBIUisconfiguredforthespecificfrequencybanditwillserve.The
twopathsintheBIUcannothavedifferentfrequencies;aGSM900BIUwi llhavetwoGSM900pathsandcannotbe
combinedwithan1800path.Separatefrequenciesre
quiretheuseofanadditionalBIU.
RFpatc
hcablesareusedtopatchtheDLandULpaths(QMA)totheICU.
TheDBI3xx(
dualslot)BIUhasanalarmoutputport(DB9femaleconnector)ontheBIUwhichcanbeusedto
connectexternalalarms.
Table 3 Alarm Port Pinout
TheBIUistechnologyneut ralandthedownlinkpathcontainssettableattenuatorsthatcanbeusedtoadjustthe
signalstrengthtoproperlevelsbeforefeedingthemintotheICU.Intheuplinkthereisanamplifierfollowedbya
settableattenuatorusedtoadjustthesignalandthenoiselevelin
tothebasestationuplink.
AllRFc
onnectionsaremadeonthefrontoftheBIU.ThemaximumrecommendedinputpowertotheBIUis30dBm.
Ahighpoweralarmisactivatedat>30dBmandalowpoweralarmat<10dBminputpower.
Inputpowerab
ovetherecommendedlevelcancausepermanentunitfailure.Forhighpowerbasestations,an
attenuatorshouldbeusedtoensurethattheinputpowertotheBIUcanneverexceedspecifications.
Thereisa0dB
minputversionoftheBIUavailableonrequest.
Pin Signal (A) Signal (B)
1 RS485+ RS485+
2Alarmout1Alarmout1
3 Ground Ground
4Notconnected Alarmin2
5Notconnected Alarmin4
6 RS485+ RS485+
7Alarmout2Alarmout2
8G Alarmin3
9Notconnected Alarmin1
CAUTION
Overdriving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exceeded.
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
TheULfromtheFOIcardiscapableofdamagingtheULportontheBIU.
MaximuminputtotheBIUULshouldbenohigherthan+13dBm.
UsecaretoproperlysetFOIlevelspriortoenablingRF.