INTRUSION ALARMS

So many types of intrusion alarm systems or combination systems are available today that a detailed discussion here would not be practical. Each alarm system is of a special nature, and no two systems will ever be identical. For more information on intrusion detection systems, refer to Design Manual 13.02.

In this section, we will cover one intrusion system developed to be used by all branches of the service. This system is called joint service interior intrusion detection system (JSIIDS). The system has been designed to protect small arms, ammunition, and sensitive materials in storage.

Purpose

JSIIDS was designed to DETECT, not prevent, an attempted intrusion. The main purpose of JSIIDS or any other alarm is to give the earliest possible notice of an attempted intrusion. The more notice the reaction force (security police) has before the intruder gets past the outer boundaries, the better the chance that the intruder will be caught.

Components

The various components of JSIIDS are of two general classes: (1) the control unit and its sensor components and (2) the monitor and display equipment.

CONTROL UNIT.\The control unit is the central control element of the JSIIDS. It is located within the protected area. It receives and processes the intrusion tamper and duress alarm signals generated at the sensors.

The control unit contains an emergency standby power supply (battery) with an automatic switchover when primary ac power is lost. It operates in much the same manner as emergency lights do.

The JSIIDS mode of operation is controlled by a key switch mounted on the control unit door. Three modes of operation are provided as follows:

1. Secure\when the protected area is not open to authorized personnel. In this mode, all alarms are processed.

2. Access\when the area is open to authorized personnel. In this mode, only tamper and duress alarms are processed.

3. Test/Reset\when electricians perform tests and maintenance. All alarms are processed, and a sounding device operates for 10 seconds at the control unit to aid in testing.

SENSOR.\There are four classes of sensor components associated with the control unit. They are classified as follows:

1. Penetration sensors-those designed to detect penetration into the protected area through doors, windows, walls, floors, ceilings, and other openings in the room.

2. Motion sensors-those designed to detect movement of a person within the protected area.

3. Point sensor-those designed to detect the attempted removal of an item from its normal position in the protected area, such as removal of a rifle from a weapons rack.

4. Duress sensor-those designed to be activated by guard personnel to call for help under a duress situation.

MONITOR CABINET.\The monitoring and display equipment is the primary notification equipment of the JSIIDS. The monitor cabinet has a self-contained signal module and primary and emergency power supply. The signal module displays the status of the monitor cabinet power supply; that is, operation on the primary or emergency power source.

DISPLAY EQUIPMENT.\The display equipment is located in an area where monitoring personnel are on duty 24 hours a day. The monitoring equipment consists of a status module or an alarm module, one for each control unit.

Status Monitor Module.\The status monitor module displays the status and mode of operation of one control unit. By looking at the lights on the status monitor module, the monitoring personnel can tell what is taking place in the protected structure.

Alarm Monitor Module.-The alarm monitor module is used in the monitor cabinets when only an alarm indication is required