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Service
19.3.4 Service
The Ethernet and configured TDM trunks throughput is calculated according to internal
product algorithms.
19.3.5 Availability
The Service Availability calculation is based on the Vigants Barnett method which predicts the
downtime probability based on a climate factor (C factor).
Availability
7 –
Cfactor
=
1 6
–
10
ExpectedFadeM
in
–
arg
----------------------------------------------------------- -
10
10
19.3.6 Antenna Height
The recommended antenna height required for line of sight is calculated as the sum the
Fresnel zone height and the boresight height. See About the Fresnel Zone below. Using the
notation of Figure
19‐1 below, splitting ExpectedRange into d
at distance d
from the left hand antenna, is given by
1
300
---------------------------------- -
frequency
GHz
0.6
---------------------------------------------------------- -
d
d
+
1
2
For the most conservative setting, we take the mid‐point between the antennas, setting
ExpectedRange
d
d
---------------------------------------- -
=
=
1
2
2
---------------------------------- -
frequency
which gives
0.6
------------------------------------------------------------------------------------------- -
ExpectedRange
---------------------------------------- -
ExpectedRange
simplifying to
0.52
---------------------------------------- -
The boresight clearance height is calculated as:
where
R
=
6367.4425Km
Mean
RADWIN 2000+ Series User Manual
frequency
GHz
d
d
1
2
ExpectedRange
300
---------------------------------------- -
2
GHz
ExpectedRange
---------------------------------------- -
+
2
.
frequency
GHz
.
Release 4.2.40
3
RequiredRange
KM
+ d
, the Fresnel zone height
1
2
2
2
ExpectedRange
2
R
---------------------------------------- -
+
Mean
2
2
R
–
Mean
19‐3
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