Adaptive channel equalization for a duo-binary transceiver

A method for adapting a channel between a first duo-binary transceiver and a second duo-binary transceiver, different from the first duo-binary transceiver, wherein a transmitter includes a feed-forward equalizer (FFE), the method comprising:

• at a receiver associated with the second duo-binary transceiver:
• (1) selectively processing level information at a given time from only an upper eye or a lower eye of a received duo-binary signal to determine updated coefficients for the FFE of the transmitter of the first duo-binary transceiver, and (2) selectively processing peak information at the given time from only the upper eye or the lower eye of the received duo-binary for automatically controlling the gain of one or more variable gain amplifiers of the receiver;
• using a backchannel between the transmitter associated with the first duo-binary transceiver and the receiver associated with the second duo-binary transceiver, sending the updated coefficients to the transmitter associated with the first duo-binary transceiver;
• and
• transmitting duo-binary signals to the receiver associated with the second duo-binary transceiver that are equalized using the updated coefficients for the FFE of the transmitter associated with the first duo-binary transceiver.