Communication link initiation method and apparatus

A computer program product comprising computer-executable instructions that are stored on a non-transitory computer storage medium and that, when executed by a processor, cause an apparatus to:

• send, to a slave node, a ninth information frame comprising fifth synchronization information and a fifth training information frame,
• wherein the fifth training information frame is a forward training information frame or a reverse training information frame, wherein the reverse training information frame comprises one or more of a reverse training information frame type, a pre-emphasis gear, or a first swing gear, wherein the reverse training information frame type identifies a type of the reverse training information frame, wherein the pre-emphasis gear configures a pre-emphasis level of a second end that sends the forward training information frame, wherein the first swing gear configures a first transmit swing of the second end, wherein the forward training information frame comprises one or more of a first count of remaining forward training information frames, a forward training information frame type, or a second swing gear, wherein the forward training information frame type identifies a type of the forward training information frame, and wherein the second swing gear configures a second transmit swing of a first end that sends the reverse training information frame.