Motorola GTR 8000 - Illegal Carrier Determination Feature (Trunked); RF Channel Interference Determination Feature (Conventional)

7.4IllegalCarrierDeterminationFeature(Trunked)
7.4IllegalCarrierDeterminationFeature(Trunked)
TheIllegalCarrierDeterminationfeatureallowsradiochannelstocontinueoperatingwithsystemcongurable
levelsofchannelinterference.InanASTRO
®
25system,thebaseradiousesReceivedSignalStrengthIndicator
(RSSI),anRFThresholdV alue,andtheMalfunctionTimerV aluetoimplementthisfeature.
Table7-1IllegalCarrierDetermination
Ifthechannelreceivesa...
andisassigned:andisnotassigned:
ValidNetworkAccessCode(NAC)Thebaseradiodoesnotchangesince
thecarrierisconsideredvalid.
IftheRFThresholdValueisexceeded,
thebaseradioenterstheIllegalCarrier
stateandthebaseradiogeneratesan
IllegalCarriermessagetoUEM.
InvalidNetworkAccessCode(NAC)
ORCarrieractivitywithoutNAC
IftheRFThresholdValuelevelisexceeded,theMalfunctionTimerValueis
activated.Afterthetimerexpires,thebaseradioenterstheIllegalCarrierstate
andthebaseradiogeneratesanIllegalCarriermessagetoUEM.
IftheillegalcarrierdisappearsordropsbelowtheRFThresholdV aluefor12.5%,
butnotlessthan10secondsofthetimeperioddenedbytheMalfunctionTimer
Value,aneventissenttoUEM.
7.5RFChannelInterferenceDeterminationFeature
(Conventional)
TheRFChannelInterferenceDeterminationFeatureallowsradiochannelstodetectRFinterferenceandlogittothe
stationlog.RFChannelInterferenceisdeclaredwhentheCarrierSquelchlevelisexceededandnoneofthereceive
qualiersaremet.ReceivequaliersaretheprogrammedPL,DPL,orRxNACforthecurrentlyactivechannel.
6871022P86-A-November20127-3