Link establishment method and apparatus, and computer readable storage medium

A link establishment apparatus, comprising an optical link auto-negotiation channel communication module and an optical module which constitute an optical link auto-negotiation channel;

• wherein the optical link auto-negotiation channel communication module is configured to exchange optical link auto-negotiation information with a central office device through the optical link auto-negotiation channel;
• wherein the optical link auto-negotiation channel is independent of a traffic data channel;
• and
• the optical link auto-negotiation information comprises at least two of:
• information about an operating wavelength channel of a terminal device, an enabled or disabled state of forward error correction between the central office device and a terminal device, a forward error correction type between the central office device and a terminal device, and an operating mode of an auxiliary management channel,
• wherein the optical link auto-negotiation channel communication module is configured to receive the optical link auto-negotiation information in one of the following manners:
• receiving optical link auto-negotiation channel information from a receive signal pin of a receiver of the optical module;
• or
• obtaining optical link auto-negotiation channel information through an optical pulse or a number of optical pulses that is formed by a change between a light state and a non-light state and received by a receiver of the optical module;
• wherein the optical link auto-negotiation channel communication module is configured to send feedback information in one of the following manners:
• sending optical link auto-negotiation channel information to a transmit signal pin of a transmitter of the optical module;
• or
• adjusting, according to the feedback information, a transmitter of the optical module to change between the light state and the non-light state to send an optical pulse,
• the optical link auto-negotiation channel communication module is built in the optical module, at least one of a channel selection module, a control module, or a clock module is built in the optical module.