Radwin 2000 D+ - Page 183

RADWIN2000D+UserManual Release3.6.00 19‐2
Calculations Chapter19
19.2Calculations
19.2.1EIRP
19.2.2ExpectedRSSandFadeMargin
where:
SiteAisthetransmittingsite
SiteBisthereceivingsite
PathLossiscalculatedaccordingtothefreespacemodel,
whereSensitivityisdependentonair‐rate.
19.2.3MinandMaxRange
MinRangeistheshortestrangeforwhichperair‐rate.
MaxRange(withAdaptivechecked)isthelargestrangeforwhich
,atthehighestair‐rateforwhichthisrelationshipistrue.Ina
linkwithadaptiveratethiswillbetheactualbehavior.
MaxRange(foragivenair‐rate)is
thelargestrangeforwhich
.
19.2.4Service
TheEthernetandconfiguredTDMtrunksthroughputiscalculatedaccordingtointernal
productalgorithms.
19.2.5Availability
TheServiceAvailabilitycalculationisbasedontheVigantsBarnettmethodwhichpr edictsthe
downtimeprobabilitybasedonaclimatefactor(Cfactor).
EIRP TxPower AntennaGain
SiteA
CableLoss
SiteA
–+=
ExpectedRSS EIRP PathLoss AntennaGain
SiteB
CableLoss
SiteB
–+–=
PathLoss 32.45 20 frequency
MHz
20 RequiredRange
Km

10
log+
10
log+=
ExpectedFadeM inarg ExpectedRSS Sensitivity–=
ExpectedRSS MaxInputPower
ExpectedRSS Sensitivity
ExpectedRSS Sensitivity RequiredFadeM inarg+