User's Manual Part 1

SystemDescription
16
DOI300 Series FOI
TheDOI300ser
iessupportsasinglefiberopticlink.Thefiber‐opticinterfacecaneitherbea WDM(DOI302)whichis
mostcommonlyusedoranoptionalduplexfeedwithseparateULand DLfibers(DOI301).BirdalsooffersaWDM
option(DOI380x).TheWDMutilizestheduplexfeedstylecardbutthewa
velengthforthedownlinkaredefinedby
the"x"intheDOI380xpartnumber.NotethattheRemoteUnitwillneedtobeorderedwiththecorrectWDM
uplinkwavelength.RefertothechartfortheWDMwavelengthsoffered.
DOI300 Series Serving Multiple Remotes
TheDOI300Serie
sFOIcanserveupto4RemoteUnitsonasinglefiberrunwhenusinganopticalsplitterinthefirst
RemoteUnit.WhenutilizingtheDOI302WDMmoduleeachRemoteUnitin theseriesmusthavedifferentoptical
wavelengthsintheuplinkpathtoavoidinterference.
Whenuti
lizingopt
icalsplitters,theopticallossofthesplittermustbeaccountedforintheopticallinkbudget.The
DOI300seriesFOIhasamaximumlinkbudgetof15dBo.
Figure13 showstheallowedFOItoFOR/Remoteconfigurations.BirdoffersvarioussplitteroptionsfortheFOR/
Remotetohelpacc
ountforopticallosses.Thestandardopticalsplitterwillhavebalancedoutputsforeachpath.
ConsultwithBirdengineeringforspecialapplications.
Figure 13 FOI to Remote Unit Configurations
DeltaNode
Wireless Technology
TM
FOI
ALM
ON
UL OUT 1
OPTO IN/OUT
TP DL
RES
TP UL
DL IN 1
DL IN 2
UL OUT 2
DeltaNode
Wireless Technology
TM
FOI
ALM
ON
UL OUT 1
OPTO IN/OUT
TP DL
RES
TP UL
DL IN 1
DL IN 2
UL OUT 2
Point-to-Point
Daisy-Chained Remotes
Hybrid Split
DeltaNode
Wireless Technology
TM
FOI
ALM
ON
UL OUT 1
OPTO IN/OUT
TP DL
RES
TP UL
DL IN 1
DL IN 2
UL OUT 2
Point-to-Multipoint
DeltaNode
Wireless Technology
TM
FOI
ALM
ON
UL OUT 1
OPTO IN/OUT
TP DL
RES
TP UL
DL IN 1
DL IN 2
UL OUT 2
Functional description
TheFOIhasanomin
algainof35dBandthelasertransmittershouldseeamaximumcompositeinputpowerof
0dBm.Thismeansthatfor0dBattenuationinthedownlinkamaximuminputof‐35dBmcompositepoweris
recommended(whenattenuatorsaresetto0dBm).Ifthedownlinkatte
nuatorissettoahighervaluethemaximum
recommendedinputisadjustedaccordingly.
Theoutputpow
erofthelaseriscalibratedto3000µW.Thiscanbeusedtocheckthelossoverfiberintheremote
becausetheremotereportsthereceivedopticallevels.Thelossmaybedifferentintheuplinkcomparedtothe
downlinkbecauseofdifferentwavelengthsonthelaser.
TheFO
Ico
ntainsseveraladjustableattenuatorswhichareusedtocompensateforlossbeforetheFOI(e.g.inthe
ICU)andforlossonthefiberintheuplink.TherearetwosetsofRFportsontheFOIthatcanbeusedtoconnect
signalsfromtwodifferentstripsinthe rack‐moun
tICU,ortwodifferentMFUICUs.
Figure14 isablockdiagramshowingthedownlinkpathintheFOIandhowthetestportisconnected.Therearetwo
attenuatorstha
tcanbesetinthedownlinkpath.Thisallowsforbalancingtheinputsignalsfromtwodifferentsignal
sourcessothattheycansharethedynamicsofthelaserproperly.