Abstract:
An onboard communication system for a locomotive consist (10) is disclosed. The communication system may have first and second locomotive communication subsystems. The first communication subsystem may be located on a first locomotive (12). Each communication subsystem may have a messaging unit (56, 58) communicatively connected to a radio (36, 38). The first messaging unit (56) may be communicatively connected to the second messaging unit (58). The second messaging unit may be configured to receive a data communication from the second radio (38) and send the data communication to the first messaging unit. The first messaging unit may be configured to receive the data communication from the second messaging unit, receive a copy of the data communication from the first radio (36), determine that the data communications are duplicate copies of one another, and send one of the data communications to a locomotive control system (20) based on the determination.
Abstract:
A receive attenuation system for a tramline communication system utilizing an intra- consist electrical cable has an analog front end amplifier, a tramline communication processor, an adjustable attenuator, and a gain controller. The tramline communication processor is configured to generate a receive gain control signal configured to control receive gain of the analog front end amplifier. The adjustable attenuator is capable of being coupled to the intra-consist electrical cable and configured to variably attenuate signals received from the intra-consist electrical cable before transmitting the signals to the analog front end amplifier, The gain controller is coupled to the adjustable attenuator and configured to detect the receive gain control signal generated by the tramline communication processor, determine a supplemental attenuation control value based on the detected receive gain control signal, and control the adjustable attenuator according to the supplemental attenuation control signal.