User's Manual

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AdvancedRFTechnologies,Inc.  61
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‐ If calculated composite HE DL input power exceeds the permitted maximum input range, then
additionalattenuationwillneedtobeaddedtothe BCUinputportsothatthecalculatedHEDL
inputpowerdoesnotexceed25dBm.
 The RFU DL input commission level is the combined DL Output
 ALC Level of the ADX‐H‐BCU which can be
obtainedfromtheControlpageoftheADX‐H‐BCU.
‐ ThemaximuminputlevelofHERFUwillnotexceed10dBm(=5dBm+10*log10(3))becausethe
maximumoutputofBCUeachpathislimitedto5dBmby
theALCfunction.
7.2.2.1.2 Exampleofcommissioningvaluecalculation
7.2.2.1.2.1 AT&TsignalinthePCSbandwithmultipletechnologies(withoutattenuation)
Table7‐3shows2technologiesbeingusedbyAT&TwithinthesamebandwhichareinputtedintotheHERFU.
Table7‐3 Inputsignalconditions@HERFUdownlink
input
WSP AT&T
Technology GSM WCDMA
Totalinputperband 20.0dBm 20.0dBm
HETotalInput 23.0dBm
 Thedownlinkinputlevelforeachtechnologyshouldbemeasuredbecausetwotechnologies(GSM&WCDMA)
arebeingusedbyAT&TinthePCSband.
‐ TotalmeasuredinputpowerforGSMis20dBmandforWCDMis20dBm.
 The HE DL maximum input level for each technology can
 be calculated by adding the back‐off value per
technologyduetotrafficloadchange(breathing).
 EstimatedTotalMaxInputperband=Totalinputperband+back‐offvalueperbandforbreathing.
 HEDLmaximuminputlevelbecomesthesumofHEDLmaximuminput
levelforeachtechnology.
‐ The sum of HE DL maximum input level for each technology is 28dBm (25.0dBm for GSM +
25.0dBm for WCDMA = 28.0dBm) and this value is 3dB (28dBm – 25dBm) larger than the
maximumDLinputofHERFU.
‐ If the calculated HE downlink commissioning
 value exceeds the maximum DL input of HE RFU,
attenuation will need to be added have the calculated HE downlink commissioning level not
exceed25dBm.
Table7‐4 HEmaximumdownlinkinputlevelwithout10dBattenuator
WSP AT&T
Totalinputperband 20.0dBm 20.0dBm
Backoffperbandforbreathing 5.0dB 5.0dB
EstimatedTotalMaxInputperband 25.0dBm 25.0dBm
EstimatedTotalMaxInput 28.0dBm
AvailableMaxInput 25.0dBm
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7.2.2.1.2.2 AT&TsignalsinthePCSbandwithmultipletechnologies(with10dBofattenuation)
After adding 10dB of attenuation to the system, the input levels per band and HE Total Input can be seen
below:
Table7‐5 HEdownlinkinputsignalconditionsafteradding10dBattenuatortoHEdownlink
inputport
WSP AT&T
Technology GSM WCDMA