Is there a common source for description (like for "data link layer" and might include electrical specification of "physical layer") of 10GBASE-T as standard for technical devices?
Considering multi data rate support (10Gbps, 1Gbps, 100Mbps), modulation type BASE, compatible medium types, coding scheme 4B/5B, 8B/10B or 64B/66B, number of lanes and lane signal rates provided.
(Example, but without description for compatibility definitions for network devices: https://www.synopsys.com/designware-ip/technical-bulletin/ethernet-dwtb-q117.html#Ethernet%20Nomenclature
802.3an is a 2006-06 standard for 10GBase-T, but not publicly available? https://en.wikipedia.org/wiki/IEEE_802.3)