Downshift for BASE-T1L ethernet

A system of a device comprising:

• one or more computer processors;
• and
• one or more memories collectively containing one or more programs, which, when executed by the one or more computer processors, perform operations, the operations comprising:
• sending, by the device via a 100BASE-T1L interface, a first capability data frame to a connected peer device;
• receiving, by the device via the 100BASE-T1L interface, a second capability data frame from the connected peer device;
• determining, by the device, a first highest common denominator (HCD) for network speed based on the first and second capability data frames;
• establishing, by the device, a network link with the connected peer device via the 100BASE-T1L interface using the first HCD for network speed;
• monitoring, by the device, a quality of the network link;
• and
• upon determining, by the device, that the quality of the network link falls below a defined threshold, sending a third capability data frame to the connected peer device that excludes the first HCD for network speed assessing, by the device, whether the first HCD for network speed is a lowest speed that the device can operate on;
• and
• upon determining that the first HCD for network speed is the lowest speed that the device can operate on, maintaining the network link at the first HCD for network speed.

One or more non-transitory computer-readable media containing, in any combination, computer program code, which, when executed by a computer system, performs operations comprising:

• sending, by a device via a 100BASE-T1L interface, a first capability data frame to a connected peer device;
• receiving, by the device via the 100BASE-T1L interface, a second capability data frame from the connected peer device;
• determining, by the device, a first highest common denominator (HCD) for network speed based on the first and second capability data frames;
• and
• establishing, by the device, a network link with the connected peer device via the 100BASE-T1L interface using the first HCD for network speed, wherein the connected peer device performs at least one of operations comprising:
• monitoring a quality of the network link, and
• upon determining that the quality of the network link falls below a defined threshold, sending a third capability data frame to the device that excludes the first HCD for network speed
• monitoring, by the device, a quality of the network link;
• and
• upon determining, by the device, that the quality of the network link falls below a defined threshold, sending a third capability data frame to the connected peer device that excludes the first HCD for network speed.