2.3.3
Detection Alarm and Reporting Capacity
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NOTE: Select system capacity parameters based on
the specific facility design requirements. System
capacity should be expressed as a binary number.
Include a 25 percent expansion factor to accommodate
changes in design caused by reconfiguration of
equipment within interior spaces or renovation.
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The IDS shall have the capacity to collect, communicate, and display up to
[12] [32] [256] [_____] sensor zone alarms [and to enable control of [one]
[two] [_____] response devices in each of the sensor zones]. If the sensor
zone is a combination of multiple alarm sources, the system shall maintain
the capability to identify individual sensors in an alarm state. A single
alarm shall be annunciated within one second average, 2 seconds maximum,
after sensor transducer or other detection device activation [except that
alarms transmitted by radio frequency signaling shall communicate in
approximately 2 seconds].
2.3.4
Probability of System Success
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NOTE: For U.S. Navy facilities, minimum Ps is 0.9.
Delete this paragraph for simple, non-high security
systems. Use this paragraph when specific DoD and
USN directives require a high level of performance,
which is usually expressed as "probability of
detection." See NAVFAC DM-13.02 for discussion of
"probability of detection."
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Success shall be predicated on the proposed system architecture. Overall
system probability of success shall be [0.90] [0.95] [0.99] [_____] minimum.
2.3.4.1
Combinational Processing
The required system probability of success at the 90 [_____] percent
confidence level is based on the standard Chi-square distribution and is
calculated from the formula Ps = Pd x Pc x Pa x Pp where:
Ps =
Probability of system success.
Pd =
Probability of detection for an individual sensor or sensor
combination when more than one sensor is used.
Pc =
Probability of correctly transmitting sensor data. The
performance measure will account for remote processing and
transmission error.
Pa =
Probability of correctly annunciating alarm data and of
providing the correct response at the operator interface,
including accounting for errors introduced by central processing
and display functions, but not including operator performance.
Pp =
Probability of providing operating power of suitable quality.
SECTION 13703N
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