User's Manual

Calculations Appendix D
RADWIN 1000/2000 User Manual Version 2.12 D-2
• Antenna gain and cable loss for ODU with integrated antenna
• Available Channel Bandwidths
Calculations
EIRP
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.
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 relation-
ship 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
.
Service
The Ethernet throughput is calculated according to internal product algo-
rithms.
Availability
The Service Availability calculation is based on the Vigants Barnett method
which predicts the downtime probability based on a climate factor (C fac-
tor).
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 Sensitivity ExpectedRSS–=
ExpectedRSS MaxInputPower≤
ExpectedRSS Sensitivity≥
ExpectedRSS Sensitivity RequiredFadeM inarg+≥