3Com Wireless LAN 11 Mbps, Руководство пользователя

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12 C
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a design, be sure that it can pass signals used in the 2.5 GHz signal range. Many
inexpensive units are available with F connectors, but these are typically designed
for cable TV-UHF applications and may degrade the signals in the band used by
the access point.
Ceiling Mount Omnidirectional Antenna
The ceiling-mount omnidirectional
antenna (model number 3CWE492)
is designed to cover large, open
areas. It should be located at or near
the center of the ceiling of a large,
open area (such as an open office
space divided into cubicles) to
provide uniform coverage in all
directions.
It is mounted by means of a single-hole stud mount, and so can be fixed easily to
drop ceiling tiles or to a solid ceiling surface where cable routing access is
available.
This antenna does not have an electrical connection between the mask mount and
the coaxial cable shield. However, adding a lightning arrestor will correct this
situation by grounding the outer shield as recommended. Some arrestor designs
provide over-voltage protection for the signal sent down the cable. If you use such
a design, be sure that it can pass signals used in the 2.5 GHz signal range. Many
inexpensive units are available with F connectors, but these are typically designed
for cable TV-UHF applications and may degrade the signals in the band used by
the access point.
Ceiling Mount Hallway Antenna
The ceiling-mount hallway antenna
(model number 3CWE497) has a
bidirectional design that makes it
ideal for use in long corridors. Its
small size means it can provide
extended WLAN coverage with
minimum visibility.
This model includes a bracket for
quick installation on standard
one-inch ceiling rails. In addition,
mounting holes allow for installation
to any flat surface with screws.