An apparatus comprising: at least a first terminal configured to couple the apparatus to a first bus wire of a communication bus and a second terminal configured to couple the apparatus to a second bus wire of the communication bus; a transceiver arrangement for communicating with one or more network nodes (101, 102, 103, 104) via the communication bus, the transceiver arrangement configured to provide differential signalling at the first terminal and the second terminal according to a communication scheme and receive differential signalling from the first terminal and second terminal from the communication bus according to the communication scheme, 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 from a fault determination device, the fault detection signal indicative of the occurrence of a fault in at least one of the communication bus and one or more connections between the apparatus and the communication bus, transmit a reconfiguration signal, wherein the reconfiguration signal is provided for transmission via at least one of said first terminal and said second terminal for said one or more 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 one or more network nodes to provide for switching from use of differential signalling to single-ended signalling using only one of the first bus wire and the second bus wire. at least a first terminal configured to couple the apparatus to a first bus wire of a communication bus and a second terminal configured to couple the apparatus to a second bus wire of the communication bus; a transceiver arrangement for communicating with one or more network nodes (101, 102, 103, 104) via the communication bus, the transceiver arrangement configured to provide differential signalling at the first terminal and the second terminal according to a communication scheme and receive differential signalling from the first terminal and second terminal from the communication bus according to the communication scheme, 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 from a fault determination device, the fault detection signal indicative of the occurrence of a fault in at least one of the communication bus and one or more connections between the apparatus and the communication bus, transmit a reconfiguration signal, wherein the reconfiguration signal is provided for transmission via at least one of said first terminal and said second terminal for said one or more 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 one or more network nodes to provide for switching from use of differential signalling to single-ended signalling using only one of the first bus wire and the second bus wire. based on a fault detection signal from a fault determination device, the fault detection signal indicative of the occurrence of a fault in at least one of the communication bus and one or more connections between the apparatus and the communication bus, transmit a reconfiguration signal, wherein the reconfiguration signal is provided for transmission via at least one of said first terminal and said second terminal for said one or more 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 one or more network nodes to provide for switching from use of differential signalling to single-ended signalling using only one of the first bus wire and the second bus wire.