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Install the HWIC and any antennas away from appliances that share the same frequency bands.
Caution
Microwave ovens, cordless telephones, and security monitors can temporarily interfere with wireless
performance.
Caution
We recommend you avoid installing wireless antennas in or near rack-mounted installations that include
networking equipment and computer servers whose radiated noise emissions can severely degrade radio
performance.
Safety Instructions
Follow these safety instructions when installing your antenna.
Warning
In order to comply with FCC radio frequency (RF) exposure limits, antennas should be located at a
minimum of 7.9 inches (20 cm) or more from the body of all persons. Statement 332
OL-17930-01
The antenna must be mounted horizontally in order to maximize its omnidirectional
Note
propagation characteristics. Mounting it vertically may noticeably decrease the antenna
range and overall performance.
Wherever possible, mount the HWIC and antenna where the wireless devices would be within sight
and avoid physical obstructions. Barriers along the line of sight between tower and HWIC will
degrade the wireless radio signals.
The density of the materials used in a building's construction determines the number of walls the
signal must pass through and still maintain adequate coverage. Consider the following before
choosing the location to install your antenna:
Paper and vinyl walls have very little effect on signal penetration.
–
Solid and precast concrete walls limit signal penetration to one or two walls without degrading
–
coverage.
Concrete and wood block walls limit signal penetration to three or four walls.
–
A signal can penetrate five or six walls constructed of drywall or wood.
–
A thick metal wall or wire-mesh stucco walls causes signals to reflect back and cause poor
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penetration.
Avoid mounting the antenna next to a column or vertical support that could create a shadow zone
and reduce the coverage area.
Keep the antenna away from reflective metal objects such as heating and air-conditioning ducts,
large ceiling trusses, building superstructures, and major power cabling runs. If necessary, use an
extension cable to relocate the antenna away from these obstructions.
Cisco Multiband Omnidirectional Panel-Mount Antenna (3G-ANTM-OUT-LP)
Safety Instructions
9
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