Radwin 2000+ SERIES, Руководство пользователя

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RADWIN 2000+ Series User Manual Release 4.2.40 19 ‐ 3
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).
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
1
+ d
2
, the Fresnel zone height
at distance d
1
from the left hand antenna, is given by
For the most conservative setting, we take the mid ‐ point between the antennas, setting
which gives
simplifying to .
The boresight clearance height is calculated as:
where .
Availability
1 6 – 10
7 –

Cfactor

frequency
GHz

RequiredRange
KM
 
3

10
ExpectedFadeM in
arg –
10
------------------------------------------------------------

=
0.6
300
frequency
GHz
----------------------------------- d
1
d
2
 
d
1
d
2
+
-----------------------------------------------------------

d
1
d
2
ExpectedRange
2
-----------------------------------------
= =
0.6
300
frequency
GHz
-----------------------------------
ExpectedRange
2
-----------------------------------------
2

ExpectedRange
2
-----------------------------------------
ExpectedRange
2
-----------------------------------------
+
--------------------------------------------------------------------------------------------

0.52
ExpectedRange
frequency
GHz
-----------------------------------------

R
2
Mean
ExpectedRange
2
-----------------------------------------
2
+
R
Mean
–
R
Mean
6367.4425
Km
=