Siemens CP 1515 Instruções de Operação Página 267

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Appendix
Operating Instructions SCALANCE W78x
C79000-G8976-C184-07
267
Receiver Sensitivity in IEEE 802.11a/h Mode (5 GHz)
Data rate [Mb/s] P
e
[dBm]
6 -87
9 -86
12 -85
18 -83
24 -80
36 -76
48 -71
54 -66
72 [*] -73
96 [*] -68
108 [*] -63
[*] Turbo mode
System Calculation Based on the Example of RCoax
Procedure
The calculation of the entire system shows whether communication is possible at
the desired transmission rate using the desired components. All losses
(longitudinal attenuation, spatial attenuation, power splitters etc.) are deducted
from the transmit power. An antenna gain is added. The result is the power fed to a
receiver. This power must be higher than the receiver sensitivity. The calculation
can be made with the following formula:
P
e
= P
0
- a
rc
- c
d
- a
ps
+ G
ANT
-
rc
-
fr
> P
e min
P
e
Receiver input power in dBm
P
0
Transmit power in dBm
a
rc
Longitudinal attenuation of the RCoax cable and the feeder in dB
c
d
Coupling loss for the distance between RCoax cable and communication
partner (see Section 0)
a
ps
Power splitter losses in dB
G
ANT
Antenna gain in dB
rc
Correction value for the longitudinal attenuation in dB. Depending on the
concrete operating conditions, between 5 and 15 dB.
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