Wayside monitoring systems

Telecommunications – Carrier wave repeater or relay system – Failure compensation

Reexamination Certificate

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Details

C455S015000, C455S016000, C246S00100C, C246S015000, C246S162000, C340S507000, C340S508000

Reexamination Certificate

active

08032078

ABSTRACT:
An interface device for interfacing a set of wayside systems with a radio transmitter includes a plurality of input ports each having at least one input for receiving a signal representing a state of a corresponding wayside system and first and second parallel data paths coupled to the plurality of input ports. Each data path includes input protection circuitry coupled to the inputs of the input ports for preventing short-circuit and open-circuit conditions from triggering a false input state, a multiplexer for selecting between the input port; and a processor for scanning the input ports with the multiplexer to determine the state of current signals appearing at the inputs. In response to determining the state of the current signals appearing at the inputs, the processor generates a message communicating a current state of the wayside systems for delivery to the radio transmitter.

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patent: 5321355 (1994-06-01), Luetzow
patent: 5369591 (1994-11-01), Broxmeyer
patent: 6034944 (2000-03-01), Seki et al.
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patent: 6381506 (2002-04-01), Grappone
patent: 6556898 (2003-04-01), Clawson
patent: 2003/0151744 (2003-08-01), Fernando et al.

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