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Wireless Bridging Systems
Wireless “bridges” are radio devices that
connect Ethernet LANs to each other without requiring cabling or leased line
connections. The main requirement for successful wireless
bridging is that of “line of site”. In
order to make a wireless connection, bridge antennas must be able to “see”
other with no obstruction or objects between them. Depending on the speed of the wireless link,
it is possible to connect sites that are up to 23 miles apart.
A common bridging design that simply connects Ethernet
between two sites is known as a “point-to-point” system. For this type bridge
installation, a bridge and antenna at site A are used
to make a wireless connection with a second bridge and antenna at site B.
Typically, antennas are mounted to the exterior building surfaces, while the
bridges are mounted inside. An antenna cable
is used to connect the bridges with their antennas.
For LAN connectivity, a run of CAT 5 from each
bridge to an Ethernet hub or switch finishes the hardware installation. Once
each bridge’s radio, LAN and security parameters have been configured, a radio
packet test is then performed in order to test the viability of the link.
Point To
Point Wireless Bridging System
For campus-like settings, a “point
multi-point” bridge system architecture can be used. Here, a site with an existing Ethernet LAN is
linked to remote buildings by using three or more bridges. As with point to point bridging, line of site
is a requirement for the remote antennas. In the diagram below, the antennas at sites B
and C must have line of sight with the antenna at site A but do not need to “see”
each other.
Point
Wireless Bridges
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Cisco Aironet 1300 Series Outdoor Access Point / ·
Supports 802.11 b/g radio standards, providing up to 54 Mbps
data rates ·
Can be configured as either an access point, a bridge or a
workgroup bridge ·
Supports point-to-point and point-multi-point installations when
used as a wireless bridge ·
Supports extended operating temperature range for installation
outdoors ·
Supports standard access point Ethernet connectivity or can be
configured as a wireless repeater. ·
Provides over-the-air compatibility with existing Cisco Aironet 350 series bridges. |
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Cisco Aironet 1400 ·
Supports data rates up to 54 Mbps ·
Supports point-to-point and point-multi-point bridging installations ·
Supports extended operating temperature range for installation
outdoors ·
Enhanced security mechanisms based on 802.11 standards ·
Integrated or optional external antennas for flexibility in
deployment |
