Remote device control

A signal transfer method includes: transferring a direct current signal between a port of a device and a physical transmission line physically coupled to the port; and passing a first signal from the wireless protocol interface to the port according to a first wireless protocol, the first signal being a first radio frequency signal; or a second signal is transmitted from the port to the wireless protocol interface according to a second wireless protocol, and the second signal is a second radio frequency signal; or a combination thereof. 一种信号传递方法，包括：在装置的端口与物理地耦合到该端口的物理传输线之间传递直流信号；以及将：第一信号根据第一无线协议从无线协议接口传递到该端口，该第一信号是第一射频信号；或者第二信号根据第二无线协议从该端口传递到该无线协议接口，该第二信号是第二射频信号；或者它们的组合。