glossary may be found in Appendix D.
This glossary will assist you in
understanding IDS.
1.
Purpose of IDS. Protective alarm systems are used to accomplish one or
more of the following:
a. Economize.
IDS permits more economical and efficient use of
manpower.
It does so by substituting mobile responding guard units for
larger numbers of patrols for fixed posts.
b. Substitute.
Some IDS are used in lieu of other physical security
measures. These are those measures which cannot be used because of safety
regulations, operational requirements, appearance, lay-out costs, or other
reasons.
c. Supplements.
IDS provides additional controls at critical points or
areas.
2.
Types of Alarm Systems and Specifications.
Alarm and communications
systems are closely allied in any comprehensive protection system.
Telephone and radio communications are common in everyday usage. Because of
this, their adaptation to a protective system poses few new problems.
An
alarm system is simply a manual or automatic means of communicating a
warning of potential or present danger. Types of alarm systems include the
following:
a. Local Alarm System.
A local alarm system is one in which the
protected area is directly connected to an alarm bell or siren. The visual
or audible signal is located in the immediate vicinity of the object of
protection. The light or sounding device must be displayed on the exterior
of the building, and it should be fully protected against weather or willful
tampering. Also, the device must be audible for a distance of at least 500
feet, if applicable. Response to the alarm is by security guards or other
personnel within sight or hearing.
They would notify the appropriate
security personnel. A residential burglar alarm system is an example of a
local alarm system. The major disadvantage is that someone has to hear, see
and report the alarm.
b. Direct Connected System. This system is one in which the protected
area is directly connected to police or fire departments via a pair of phone
wires.
These systems insure constant monitoring and quick response to
alarms. A major disadvantage is dual responsibility for maintenance, since
the user must sell the alarm system to the police in order to install it.
c. Central Station Alarm.
In this system a secured area is directly
connected to the alarm panel in a centrally located receiving station via
phone lines. A commercial agency usually contracts to provide designs and
installation. The agency usually provides for maintenance and operation of
such systems. They will dispatch guards to the location of the secured area
and will also notify police. Alarm installation of this type can only be
made when the premises are within 10 minutes of traveling time from the
central office. This system is expensive to maintain; however, it insures
dedicated
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