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Wireless
Mesh Radio Networks
provide the most comprehensive offering for the
alarm industry by overcoming the drawbacks associated with alternative
offerings.
The
upfront investment in establishing a wireless mesh network is relatively
small compared to traditional communications systems. A typical
field installation can be done in one day and is not dependant on
third parties. There are no recurring monthly costs, such as those
associated with phone or cellular time or leasing radio tower space
since a wireless network provides its own communication medium.
The network provides high levels of redundancy and reliability at
low operational costs. As additional subscribers are brought on
line the network naturally expands. Every additional remote site
expands the network allowing signals to be "smartly routed"
to the receiving center via the most efficient path. Thus, as the
network grows it becomes more redundant and reliable. The operator
is also the owner and maintains complete control over the network
Telephone Line - Has
the advantage of being available in most places but has a relatively
high monthly recurring cost, installation may take weeks, and there
is no redundant communications path even if two phone lines are
engaged. Neither the end user nor the Central Station operator have
any control over the network and are subject to line cuts, weather,
and equipment malfunction. With new laws enabling cell phone users
to keep their telephone numbers even when they change carriers,
many have disconnected their landline based home phones, cutting
their connection to the central alarm monitor.
Direct Wire - An antiquated
technology provided by telephone companies, Direct Wire circuits
connect a premise to a monitoring station utilizing a supervising
current. Direct Wire has limited availability, is expensive by comparison
and provides little critical event information.
Derived Channel - Derived
Channel circuits were prevalent in major market centers and established
between the protected premise and Telco Central office by use of
a poll-response protocol and sub-audible tone on POTS circuits.
The telephone companies are currently eliminating Derived Channel
offerings due to low customer volumes and technological incompatibilities
with multiplexing technologies used today in the ordinary routing
of phone calls.
Cellular - Installation
can be done in one day as opposed to standard telephone lines, but
this option still has a high monthly recurring cost and network
coverage is far from everywhere, particularly in rural areas. Transmission
times can often be lengthy as the call traffic is routed through
multiple centers prior to arriving at the monitoring sites. Cellular
frequencies are publicly known meaning jamming devices may be easily
purchased to interfere with signals. Operators have no control over
the transmission network.
Satellite - Network
coverage is pretty much everywhere including rural areas, but it
has a very high monthly cost and the equipment can be quite costly.
There is, therefore, very little implementation in the life safety
industry.
Private Tower-Based Radio - There
is a high upfront investment in the receiving equipment at the monitoring
site and repeater tower space is prohibitively expensive, as rental
fees have escalated dramatically in the last 24 months. Extending
geographic network coverage requires significant capital and operating
expenses from the licensee as well as a high level of radio and
engineering expertise. One-way radio transmission offers no supervision
from the operating centers to dispersed network devices. While 2-way
private radio towers offers the ability to interrogate network devices,
the systems still suffers from the same limitations of single point
systems.
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