User's Manual Part 1

Confidential&Proprietary37/117 SC‐DAS
Figure4.12–ODUInternalView
No. Unit Description Remark
1 DOU
DonorOpticUnit
ConvertsTXRFsignalsintoopticalsignals;
ConvertsRXopticalsignalsintoRFsignals;
ProvidesuptofouropticalportsperDOU
Max2ea.
2 2W
2WayDivider
DividesTXRFsignalsintotwo;
CombinestwoRXRFsignalsintoone

3 DU
DistributionUnit
DistributespowerandsignalstoDOU

4 Shelf 19”rack,1RU 
5 Accessories
25PINDSUB,Maletofemale1pcs
RFCoaxialCableAssembly2pcs

4.2.4 SubAssemblydescription
1)DonorOpticUnit(DOU)
TheDOUperformstheRFtoopticalconversionofTXsignalsaswellastheopticaltoRFconversion
ofRXsignals.
Using an optical splitter, this unit divides optical signals from a Laser Diode into four and then
distributesthemtoeachopticalport. With
atotaloffourPhotoDiodesinRX,theDOUperformsthe
opticaltoRFconversionofsignalsreceivedfromeachopticalport.Inaddition,theunitisequipped
withanATTtocompensateforopticallossinthefiberorfiberconnectors.
SinceisusesaWDM,ituses
onlyonestrandoffiberforeachROUitconnectsto.
WithinternalFSKmodem,itwillallowoperationfromaremotesite.