Auto-sequencing transmission speed of a data port

A method of auto-sequencing transmission speed of a data port, comprising:

• the data port executing auto-negotiation with a second data port, to determine a highest common transmission speed supported by the data port and the second data port, each port advertising transmission speeds the port can support;
• determining a transmission signal quality of each of four pairs of wires of a cable connected to the data ports during a link training phase;
• determining whether the transmission signal qualities of the pairs is high enough to support a negotiated transmission speed;
• if the transmission signal qualities of the pairs is below a threshold required for the negotiated transmission speed, then updating the transmission speed advertised by the port;
• and
• re-executing the auto-negotiation.

A method of auto-sequencing transmission speed of a data port, comprising:

• the data port executing auto-negotiation with a second data port, to determine a highest common transmission speed supported by the data port and the second data port, each port advertising transmission speeds the port can support;
• determining a transmission signal quality of each of four pairs of wires of a cable connected to the data ports;
• determining transmission signal qualities during a link training phase, the transmission signal qualities being used to determine coefficients of digital signal processing to be used during data transmission through the data port;
• checking whether the transmission signal qualities of the pairs is high enough to support a negotiated transmission speed;
• if the transmission signal qualities of the pairs is below a threshold required for the negotiated transmission speed, then updating the transmission speed advertised by the port;
• and
• re-executing the auto-negotiation.