Graphics courtesy Cambium Networks
robust protocol that allows high-speed transmission at longer distances and can trade speed
for distance or vice versa.
"Before implementing a wireless system, a
link analysis should be done on the proposed
locations and path to determine the probability
of success of the connection," Torok said. The
analysis determines where dishes need to be
placed. A wireless provider can manage the
analysis.
The 802.11n protocol also gives integrators
speed without requiring more spectrum. It
uses spatial multiplexing (SM) to split data into
pieces. It then sends each data piece on parallel
"spatial" channels—much faster than it would
take to send that same data serially. Without SM,
802.11n can achieve 150 Mbps. With SM, it can
hit 300 or 450 Mbps if both the transmitter and
receiver have at least two and three antennas
(and RF chains), respectively.
Terminology and nomenclature
Hardwired communications networking boosts costs from
time, labor and equipment.
Graphics courtesy Cambium Networks
In telecommunications, a point-to-point connection refers to a wireless connection between
two antennae that beam signals to one another,
Torok explained. "Wireless systems have a low
probability of being intercepted, as it is nearly
impossible to decrypt a point-to-point system,"
he said.
Two types of wireless networks are popular:
Microwave links use high-powered transmission
that ranges from 1 GHz to 30 GHz in frequency,
depending on how far the communication must
go. "This is a very popular backhaul technology used for voice," Torok said. Microwave systems are transparent to the user. They provide
a secure connection for private enterprises.
OFDM is the most popular connection for data
transmissions. It is a strictly IP-based technology that is easy to align and configure. OFDM
is a private IP-based option that ranges from 0
to 80 GHz, similar to microwave links.
"Both types of wireless network provide a
private connection that transfers data without a
monthly fee to a telco. You own it. You manage
it," Torok said. The major cost is for a radio and
antennas.
Fixed wireless has a range from 100 feet to
Wireless solutions for video include far fewer components
than traditional hardwired communications.
www.SecurityInfoWatch.com | SD&I; | January 2013
25