unique identification code. Transmitter shall be capable of
transmitting 2 watts of RF power. Transmitter shall transmit up
to [500] [_____] times on the power provided by internal
batteries. A small, flexible PVC-encased antenna shall be mounted
12.7 mm 1/2 inch away from the transmitter to ensure reliable
propagation of the alarm signal and rotation of 6.28 rad 360
degrees without damage to the sensor. Provide transmitter in a
corrosion-resistant case. Transmitter shall be available in both
VHF and UHF radio bands. Transmitter shall be FM modulated to
ensure reception and decoding of the alarm signal. The signal
transmitted shall readily interface with the IDS communications
subsystem as specified in paragraph entitled "Radio Frequency
Link." Activation of the sensor shall be by hand-operated switch
protected from accidental activation, yet easily activated by hand
when worn at the waist on a belt. [Sensor activation shall be
automatic when mounted on a belt and when the wearer is in a
horizontal position for an adjustable time interval of longer than
[1] [5] [15] [_____] minutes. Adjustment of time interval
activation shall not be accessible to operations personnel.]
2.4.13
Communications
Communications shall link together the subsystems of the IDS. IDS
communications links shall be via hardwire (cable)[, or radio frequency].
Communications links shall be supervised. Common communications interface
devices shall be provided throughout the IDS. Sensor to control
communicator interface shall be by dry relay contact normally open or
normally closed, except as specified otherwise. Control communicator to
central alarm reporting processor interface shall be digital, asynchronous,
derived channel, or multiplexed data. Individual data bits shall be
grouped into word format and transmitted as coded messages. Interface
shall be implemented by modems which shall function as a communications
controller, perform data acquisition and distribution, buffering message
handling, error checking, and signal regeneration as required to maintain
communications.
2.4.13.1
Sensor to Control Communicator Link Supervision
Provide hardwire direct current line supervision for sensor to control
communicator links which are within the IDS protected area. Circuit shall
be supervised by monitoring changes in the current that flows through the
detection circuit and a terminating resistor of at least 1.0 kohm.
Supervision circuitry shall initiate an alarm in response to opening,
closing, shorting, or grounding of the conductors by employing Class C,
Standard Line Security. Class C circuit supervisor units shall provide an
alarm response in the annunciator in not more than one second as a result
of the following changes in normal transmission line current:
a.
Five percent or more in normal line signal when it consists of
direct current from 0.5 milliamperes through 30 milliamperes.
b.
Ten percent or more in normal line signal when it consists of
direct current from 10 microamperes to 0.5 milliamperes.
c.
Five percent or more of any element or elements of a complex
signal upon which security integrity of the system is dependent.
This tolerance will be applied for frequencies up to 100 Hz.
d.
Fifteen percent or more of any element or elements of a complex
SECTION 13702N
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