User's Manual

Confidential&Proprietary114/115 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 wi ll  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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