Patent ID: 7036031

Claim:
An electronic device comprising at least a transceiver and a physical layer which transmits and receives data to and from said transceiver, said electronic device communicating with another electronic device via a bus to which said transceiver is connected, wherein said physical layer comprises means to control a mode of operation of said transceiver based upon a state of operation of said physical layer, said physical layer comprises: one or more transmission/reception ports; a state machine circuit which controls transition of state for each port, said state being among a disconnected state, a suspended state which is the interrupted state, a resuming state which is a resuming process from said disconnected state or said suspended state to an active state and an active state; and means which makes active a standby signal to output said standby signal, said standby signal being a control signal to instruct said transceiver connected to said transmission port to change into the lower power consumption mode, when a state of said transmission/reception port, state transition of said transmission/reception port being managed by said state machine circuit of said physical layer, is in the disconnected state, or when said transmission/reception port is changed into the suspended state in response to an instruction issued from another electronic device which is connected via said bus to said electronic device or from a higher level device of said electronic device.