Abstract: A telemetry system is described including a remote unit having a remote input unit coupled to a remote transmit unit. The remote input unit receives one or more sensor output signals and produces a sensor status signal dependent upon the sensor output signals. The sensor status signal alternates between a first state and a second state, wherein an amount of time the sensor status signal remains in the first state is dependent upon one of the sensor output signals. An amount of time the sensor status signal remains in the second state may depend upon sensor output signals from other sensors. The remote transmit unit receives the sensor status signal and transmits a transmit signal each time the sensor status signal transitions between the first and second states. The transmit signal may be a frequency modulated radio frequency carrier signal including a status portion having direction information indicating a direction of the transition between the first and second states.

Abstract: The compact brouting switch allows communication between external systems with differing or same protocols. The compact brouting switch includes switch ports which receive and transfer data between the external systems. A processor in the switch controls the movement of data within the switch and assigns data to specific switch ports to transfer data to specific external systems. However, the switch ports also have the capability of directly transferring data from one external system to another external system bypassing the processor.