Abstract: A ground device includes a control unit, a storage unit, and a ground transmitting and receiving unit. A ground antenna is connected to the ground transmitting and receiving unit. Train information from an on-board device is received by the ground transmitting and receiving unit via the ground antenna, and is then transmitted to the control unit. Meanwhile, information from the control unit is transmitted to the on-board device via the ground transmitting and receiving unit and the on-board antenna. The control unit accumulates the train information on a train in the storage unit, and also transmits, to the on-board device, command information for a device installed in the train.

Abstract: A ground device includes a control unit, a storage unit, and a ground transmitting and receiving unit. A ground antenna is connected to the ground transmitting and receiving unit. Train information from an on-board device is received by the ground transmitting and receiving unit via the ground antenna, and is then transmitted to the control unit. Meanwhile, information from the control unit is transmitted to the on-board device via the ground transmitting and receiving unit and the on-board antenna. The control unit accumulates the train information on a train in the storage unit, and also transmits, to the on-board device, command information for a device installed in the train.

Abstract: An inter-vehicle network that connects monitoring and control devices communicating with an intra-vehicle network that couples in-vehicle devices with the monitoring and control devices. A train clock station at an uppermost level in a hierarchical structure and a vehicle clock station in a middle level in a hierarchical structure are established from the monitoring and control devices. Other devices are established as a correction information waiting station at a lowermost level in the hierarchical structure. The train clock station performs a time correction of its own station with time information that is arbitrarily obtained as reference time. The vehicle clock station performs a time correction of its own station based on a message transmitted from the train clock station. The correction information waiting station performs a time correction of its own station based on a message transmitted from the vehicle clock station.

Abstract: A railway-train communication apparatus transmits a first transmission signal flowing through an inter-car network between cars of a railway train and a second transmission signal flowing through an in-car network in each of the cars. A node device includes a first signal converter and a second signal converter that perform a signal conversion between the first transmission signal and the second transmission signal and a layer 2 switch arranged between the first signal converter and the second signal converter for connecting the first signal converter and the second signal converter. A first controller is connected to the layer 2 switch.

Abstract: A pair of transmission lines 17a, 17b are provided in the train in such a manner that, at each of the two ends of each of the carriage groups, one of the train end detection switches 41 is connected to one of the pair of transmission lines. A resistor 34 is inserted in at least one of the pair of transmission lines, and a voltage detector measures a voltage V1, V2 between the pair of transmission lines at each of both ends of the resistor. A controlling unit controls a first and a second switches 33a, 33b in such a manner that there is only one location within the train where a power supply 31, 32 is inserted between the pair of transmission lines, and the controlling unit recognizes the configuration of the train based on the voltages that have been measured by the voltage detectors.

Abstract: An inter-vehicle network that connects monitoring and control devices communicating with an intra-vehicle network that couples in-vehicle devices with the monitoring and control devices. A train clock station at an uppermost level in a hierarchical structure and a vehicle clock station in a middle level in a hierarchical structure are established from the monitoring and control devices. Other devices are established as a correction information waiting station at a lowermost level in the hierarchical structure. The train clock station performs a time correction of its own station with time information that is arbitrarily obtained as reference time. The vehicle clock station performs a time correction of its own station based on a message transmitted from the train clock station. The correction information waiting station performs a time correction of its own station based on a message transmitted from the vehicle clock station.

Abstract: A pair of transmission lines 17a, 17b are provided in the train in such a manner that, at each of the two ends of each of the carriage groups, one of the train end detection switches 41 is connected to one of the pair of transmission lines. A resistor 34 is inserted in at least one of the pair of transmission lines, and a voltage detector measures a voltage V1, V2 between the pair of transmission lines at each of both ends of the resistor. A controlling unit controls a first and a second switches 33a, 33b in such a manner that there is only one location within the train where a power supply 31, 32 is inserted between the pair of transmission lines, and the controlling unit recognizes the configuration of the train based on the voltages that have been measured by the voltage detectors.

Abstract: A railway-train communication apparatus transmits a first transmission signal flowing through an inter-car network between cars of a railway train and a second transmission signal flowing through an in-car network in each of the cars. A node device includes a first signal converter and a second signal converter that perform a signal conversion between the first transmission signal and the second transmission signal and a layer 2 switch arranged between the first signal converter and the second signal converter for connecting the first signal converter and the second signal converter. A first controller is connected to the layer 2 switch.