Device and method for wake-up signalling

Method for performing wake-up signalling between a host device and a client device of a communication system, said host and said client device being in a two-wire connection (1) to exchange power and data communication with each other and at least one of said host and said client device being in an idle state, said host and said client device each comprising a data controller (3) arranged for data communication control and a power state controller (5) arranged to switch the host device or client device between at least an active state and said idle state, whereby said data controller of said at least one of said host and said client device is disabled during said idle state, the method comprising

• generating in the power state controller (5) of said host device or client device a wake-up signal and transmitting said wake-up signal via said two-wire connection to the other device, said other device being in said idle state,
• detecting said wake-up signal with the power state controller (5) of said other device and, upon said detecting, setting a control signal to transition said other device out of said idle state;
• wherein said power state controller of said client device generates said wake-up signal and said power state controller of said host device detects said wake-up signal.