Relay set in network device and method thereof

摘要

A relay set in a network device. The relay includes a first switch, a switch control unit, and a first AC coupling unit. The first switch is coupled between a first receiving end of the network device and a first transmitting end of the network device. The switch control unit is configured to turn off the first switch when the network device is in a first state. The first AC coupling unit is configured to turn on the first switch according to a first signal received from the first receiving end when the network device is in a second state.