| 摘要 |
The system comprises transceivers (24) employing identical modems, one (32) located at a fixed position and connected to the ceiver's specialized modems may be connected to a central or to a communications bus as required. Additional transceivers may be connected to the communications bus (44) for communication between the central host and additional wires (48, 54). All central host signals are transmitted to all wire connected modems and sent out on all wires. All signals from vehicle modems are transmitted back to the central host. Each transceiver is adapted to employ one or more identical modem, each connected to a different wire. Communication between the wire and a vehicle is by means of an inductive coupler (60) employing ferrite rods (132, 134, 136) which is designed such that the transfer function from the fixed modem to the vehicle mounted modem is substantially identical to the transfer function from the vehicle modem to the fixed modem. |
