Homeland Security Wireless Services
In 2003 the FCC assigned the
4940-4990 MHz frequency band for Public Safety use. Any
qualified agency may now obtain a license and use the band.
As a licensed band the greatest advantage that the 4.9 GHz band
offers is an interference free operating environment for
Public Safety broadband communications, now and in the
future. Some municipalities were early adopters of Unlicensed
systems in the 2.4 and 5.8 GHz operating bands, however they are
now finding increasing cases of interference from commercial and
private operations in these bands, particularly in the 2.4 GHz
Leased T1 services
Municipal authorities and public
safety agencies typically have multiple leased T1 services from
Service Providers. Costs for these services can be several
hundred dollars per month. Rolling these services to a 4.9
backbone system can result in very large savings.
A 4.9 GHz backbone can be used to support specially equipped
mobile units such as SWAT vans, or
Mobile Incident Command Centers, providing broadband links into
municipal or public safety agency infrastructure and networks.
These units can also be equipped as repeater sites, providing
temporary broadband support to first responders.
Almost all municipal and public safety locations have internet
connectivity these days, this is typically provided by
connection to a service provider on a site by site basis. A 4.9
municipal wireless system will allow connection to Internet at a
single location, with distribution to all other locations via
the 4.9 backbone.
Leased voice services, Control and Telemetry
In addition to T1 and other multi-channel services,
municipalities and public safety agencies typically lease
multiple single channel services. These services can also be
rolled to a 4.9 Ghz backbone for additional savings.
Voice-Over-IP technology enables voice calls via the network.
In addition to other services a
4.9 Ghz backbone system can support a city wide Video
Surveillance system. Other monitors such as pollution monitors
and weather stations can also be supported. The system supports
content transmission in the downstream directions as well,
permitting the installation of public alert and municipal
A 4.9 GHz backbone can be used as an alternative path for
critical communications systems, hardening them for continued
operation in times of emergency.