Abstract: A medical assembly, such as an artificial heart assembly, adapted to be implanted within a living subject is composed of an implantable data communications interface adapted to receive an encoded data signal from a data communications interface located outside the subject at a position remote from the medical assembly. The encoded data signal is transmitted in a plurality of periodic signal bursts, which are transmitted at a first frequency to represent a first data value and a second frequency to represent a second data value. Each of the bursts comprises a plurality of signal transitions having a third frequency greater than both the first and second frequencies.

Abstract: A medical assembly, such as an artificial heart assembly, adapted to be implanted within a living subject is composed of an implantable data communications interface adapted to receive an encoded data signal from a data communications interface located outside the subject at a position remote from the medical assembly. The encoded data signal is transmitted in a plurality of periodic signal bursts, which are transmitted at a first frequency to represent a first data value and a second frequency to represent of second data value. Each of the bursts comprises a plurality of signal transitions having a third frequency greater than both the first and second frequencies.

Abstract: A method and system for handling transport overhead on a ring network. The system includes a ring network having a plurality of network elements communicating a signal along the network. In one embodiment, a method is provided for restoring transport overhead along the ring network. This method includes designating a first of the plurality of network elements as a master network element and inserting a first transport overhead break on the ring network by the master network element. The method further includes detecting a failure of the signal by a second network element and inserting a second transport overhead break on the ring network by the second network element in response to the detection of a failure. Finally, the method includes removing the second transport overhead break under the direction of said master network element.

Abstract: A fuel preheating unit for diesel engines includes a heat exchange coil positioned in a fluid-tight enclosure having an inlet and outlet for a heat exchange medium, such as hot coolant or lubricant from the engine. The coil has a length of at least one foot for each 25 cubic inches of enclosure volume and has ends connected to a diesel fuel inlet and outlet on the enclosure. A spray tube connected to the heat exchange medium inlet extends horizontally below the entire length of the coil and has a plurality of upwardly directed openings for discharge of the heat exchange medium toward the coil for agitation of the medium in the enclosure around and over the coil. The enclosure is provided with an electric heater for heating the heat exchange medium during cold weather to assist in heating the fuel prior to the time the engine reaches operating temperature.