Method to link Ethernet communication for digital protection delay and digital protection delay that performs the same

摘要

A method for establishing an Ethernet communication link of a digital protection delay having at least two communication ports, the method comprising: configuring (S301) physical layers of a first communication port (451) and a second communication port (452), wherein the first communication port is coupled to a first Ethernet controller (441) and the second communication port is coupled to a second Ethernet controller (442); determine whether the self-negotiation with respect to the first communication port or the second communication port is satisfactory or not (S302); and replace (S303) configuration information concerning one of the physical layers of the first communication port and the second communication port with configuration information relating to the other of the physical layers of the first communication port and the second communication port, depending on whether the auto-negotiation with respect to each of the first communication port and the second communication port has been satisfactory or not, and establish, through the communication port that the auto-negotiation failed, a communication link using configuration information referring to the communication port that has successfully performed the auto-negotiation and physical layer configuration as configuration information referring to the communication port that has failed the auto-negotiation, thus establishing an Ethernet link for each communication port, in which the determination of whether self-negotiation with respect to ac One of the first communication port (451) and the second communication port (452) has been satisfactory or does not include: starting a timer (S202) that has an established expiration period and determining whether the timer has expired or not (S204 , S207).