Abstract: A transmission device for the intrinsically safe transmission of data in an Ethernet network via a core pair of an Ethernet cable is disclosed. The transmission device includes a first sub-path connected to a first wire of the core pair of an Ethernet signal pair and a second sub-path connected to a second wire of the core pair of the Ethernet signal pair. Each sub-path comprises at least one current-limiting resistor and a common-mode rejection unit connected in series to the current-limiting resistor.

Abstract: An arrangement is described for supplying electrical power to a field device (10) with a housing (11) for monitoring a technical process in a process installation, without the use of wires, which field device (10) has a wire-free communication interface (5). The field device (10) has at least one field device face (11a) facing the process and at least one field device face (11b, c, d) facing away from the process, and is equipped with a thermoelectric transducer (14) which has a transducer face (14b) facing the process and a transducer face (14c) facing away from the process. The heat flow in the field device between the field device face (11a) facing the process and the field device face (11b, c, d) facing away from the process is converted into electrical energy by the thermoelectric transducer (14), and this conversion process may be bidirectional.