Patent Document ID: 9252968
Application ID: 13531145
Patent Flag: 1

Claim One:
1. A method for link training for a high-speed Ethernet link, comprising: transmitting training frames from a transmit port to be received at a receive port; each training frame comprising a frame marker portion, a control channel portion, and a training pattern portion and employing four-level pulse amplitude modulation (PAM4) signaling including a low level signal, a first intermediate level signal, a second intermediate level signal, and a high level signal; employing four-level signaling for the training pattern portion of the training frame, the four-level signaling including the low level signal, the first intermediate level signal, the second intermediate level signal, and the high level signal; and employing only the low and high level signals for the frame marker and control channel portions of the training frame, wherein the high-speed Ethernet link employs a Physical layer including a Physical Media Attachment (PMA) sublayer that is configured to perform a plurality of adaptation processes including an overhead insertion process, a termination process, a Gray coding process, a precoding process and a PAM4 encoding process, and wherein the training pattern data corresponding to the training pattern portion of the training frame is generated in a manner that bypasses the overhead insertion process in the PMA sublayer.