User guide

Building Your Canopy Network March 2005
Through Software Release 6.1
Issue 1 Page 129 of 425
Canopy System User Guide
Variable
Frequency
Band
Antenna
P G
S
d
1
Recom-
mended
Distance
Power
Compliance
Margin
internal
0.2 W
(23 dBm)
5.0
(7 dB)
10
W/
m
2
0.09 m
20 cm
(8 in)
5
5.4 GHz
internal
+
reflector
0.0032 W
(5 dBm)
316
(25 dB)
10
W/
m
2
0.09 m
1.5 m
(5 ft)
280
internal
0.2 W
(23 dBm)
5.0
(7 dB)
10
W/
m
2
0.09 m
20 cm
(8 in)
5
5.7 GHz
internal
+
reflector
0.2 W
(23 dBm)
316
(25 dB)
10
W/
m
2
0.71 m
1.5 m
(5 ft)
4.5
NOTES:
1. Calculated.
15.2 REDIRECTING LIGHTNING STRIKES
To protect both your staff and your equipment, implement lightning protection as follows:
◦ Observe all local and national codes that apply to grounding for lightning
protection.
◦ Install your modules at least 2 feet (0.6 meters) below the tallest point on the
tower, pole, or roof.
◦ Install lightning arrestors to transport lightning strikes away from equipment. For
example, install a lightning rod on a tower leg other than the leg to which you
mount your module.
◦ Connect your lightning rod to ground.
◦ Use a Canopy Surge Suppressor on the Ethernet cable
− at each interval along the tower leg.
− where the cable enters any structure. (Instructions for installing a Canopy
Surge Suppressor are provided in Procedure 32 on Page 271.)
15.3 CONFORMING TO REGULATIONS
Ensure that your network conforms to applicable country and local codes, such as the
NEC (National Electrical Code) in the U.S.A. If you are uncertain of code requirements,
engage the services of a licensed electrician.
15.4 PROTECTING CABLES AND CONNECTIONS
Wind
Cables that move in the wind can be damaged, impart vibrations to the connected device,
or both. At installation time, prevent these problems by securing all cables with cable ties,
cleats, or PVC tape.