An apparatus comprising a first and second terminal configured to couple the apparatus to a first and second bus wire of a communication bus; a transceiver arrangement for communicating with one or more network nodes via the communication bus, the transceiver arrangement configured to provide and receive differential signalling according to a communication scheme to/from the communication bus, wherein the communication scheme defines at least a voltage to be used to provide said differential signalling; the apparatus configured to: based on a fault detection signal indicative of the occurrence of a fault in at least the communication bus, transmit a reconfiguration signal for the network nodes and wherein at least part of the reconfiguration signal has a high-voltage-level comprising a voltage higher than that defined in the communication scheme for said differential signalling; and wherein said reconfiguration signal is configured to cause the network nodes to switch single-ended signalling.