Watchguard Firebox SOHO 6 Wireless User Manual page 36

Chapter 1: Introduction
• Amount of directional antenna gain at the transmitter and the
receiver
• Signal attenuation (path-loss) between the transmitter and
receiver
Transmitted power
The SOHO 6 Wireless transmits at 15 dBm (0.032 Watts),
which meets the requirements for operation in the United
States and Europe. The maximum transmission power of
devices that are certified as 802.11b-compliant is 1 Watt in
the United States and 0.1 Watt in Europe. The channels
used for 802.11b devices in the United States are different
from the channels used in Europe.
Antenna directional gain
Antenna directional gain results from the degree to which
the radiation pattern of an antenna is focused in a specific
direction. A highly directional antenna has a higher gain.
The SOHO 6 Wireless uses 5 dBi antennas. These antennas
have a maximum 5 dBi gain pattern perpendicular to the
antenna position. The antenna gain of a laptop computer
with an embedded wireless antenna may be as low as
-10 dBi.
Signal attenuation (path-loss)
The following equation is used to determine the signal
attenuation (path-loss):
The "distance" is the line-of-sight distance between the
transmitter and the receiver.
The "wavelength" is the speed of light divided by the
frequency. Higher frequency signals have a shorter
wavelength. Shorter wavelength signals have a higher
10
×
loss = 20 log 10 4π
dis tan ce
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×
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
wavelength
WatchGuard Firebox SOHO 6 Wireless
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