IEEE 1570-2002 pdf download IEEE Standard for the Interface Between the Rail Subsystem and the Highway Subsystem at a Highway Rail Intersection
3. Definitions, abbreviations and acronyms
3.1 Definitions
For the purposes of this standard, the following terms and definitions apply. IEEE 100, The AuthoritativeDictionary of lEEE Standards Terms (B4], should be referenced for terms not defined in this clause.
3.1.1 authority having jurisdiction: The entity that defines the contractual (including specification)requirements for the procurement of the HRI interface equipment.
NOTE-It is likely that there will be separate authorities having jurisdiction over the railway subsystem and the highwaysubsystem.
3.1.2 active grade crossing warning system: The flashing-light signals, with or without warning gates.together with the necessary control equipment used to inform road users of the approach or presence oftrains at a highway-rail grade crossing.
3.1.3 advanced preemption: Notification of an approaching train is forwarded to the highway signal trafficsignal controller unit or assembly by railroad equipment for a period of time prior to activating the railroadactive warning devices.
3.1.4 advance preemption time: This period of time is the difference in the maximum preemption timerequired for highway traffic signal operation and the minimum warning time required for railroadoperations.
3.1.5 advanced transportation controller: A complete electrical device mounted in a cabinet for control-ling the operation of a variety of functions within the roadway subsystem as defined in the National ITSArchitecture Version 3.0.
NOTE-For the purposes of this standard, a hiehway traffic signal controller shall also be considered as an advancedtransportation controller.
3.1.6 controller assembly: A complete electrical device mounted in a cabinet for controlling the operationof a highway traffic signal installation.
3.1.7 crossing: See: highway-rail grade crossing.
3.1.8 entrance gate: A highway rail crossing warning gate used on the approach lanes of traffic toward ahighway rail grade crossing.
3.1.9 exit gate: A highway rail crossing warning gate used on the exit lanes of traffic from a highway railgrade crossing
3.1.10 fail-safe: A design philosophy applied to safety-critical systems such that the result of a hardwarefailure or the effect of software error shall either prohibit the system from assuming or maintaining an unsafestate, or shall cause the system to assume a state known to be safe.
3.111 fail-safely: The implementation of a function in a fail-safe manner.
3.1.12 gate down: A crossing gate is in the down position when it is some predetermined number of degreesfrom vertical (typically 85 to 92 degrees depending on specific gate mechanism adjustment).
IEEE 1570-2002 pdf download
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