User's Manual

Confidential&Proprietary121/122 SC‐DAS
‐12dBm 8dB ‐1dBm 19dB +9dBm 29dB
‐11dBm 9dB 0dBm 20dB +10dBm 30dB
‐10dBm 10dB 
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7.5 Inputpowerlimitfunction(TXInputALC)
TheDAShasaTXinputALCfunctionattheBIUtolimitlevelwheninputpowerisincreased
abovelevelbyoperatedinputAGCfunction
Normally,therearenomorethantwoinputportsintheMDBUoftheBIU
Forexample,the850cellularbandhastwoinputports
tosupportbothVzWandAT&T
Thesetwoinputpowersmaybedifferentfromeachother.TheDAShasaninputattenuator
infirststageoftheMDBU.ThroughinputAGCfunction,theinputATTisadjustedaccording
to the input power. If input power increases, the input ATT is
adjusted again to limit
increased input powerandiftheinputpowerdecreases,theinputATTwillreturntothe
initialATTsetting.
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7.6 Opticallosscompensation
TheDAShasthefunctionofautomaticallycompensatingforopticalloss.Itcandothework
forupto5dBoofopticalloss.Set“TXOPTICCOMP”ofROUas"ON."Opticalcompensation
of ROU can not be madewithoutcommunicationtotheODUorOEU.For1dBoofoptical
loss,
basicTXOPTICATTis1dB;for5dBoofopticalloss,TXOPTICATTis4dB.OPTICCOMP
worksonlyonetimebeforeitstaysdormant.
ThefigurebelowshowsascreenforOPTICInformationintheROUGUI.
LDPOWERreferencestheoutputlevelofROULaserDiode,which
issenttoaupperunitby
ROU.PDPOWERreferencestheinputlevelofPhotoDiodetobereceivedfromaupperunit.
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