Fiber optic, as far as I know.
10base_T
If you have a 10GBase-T stream attempting to transport over a 100Base-T link, you're going to totally max out the 100Base-T. Only expect to get 100 Mbit/s end-to-end. Any transport system is only going to be as fast as its slowest link. OTOH, sending 100Base-T traffic over a 10GBase-T link will work just fine - you'll get the full 100 Mbit/s all the way.
twisted pair
They won,t the Riches were cancelled last year after two seasons. Google the show for details.
They are best suited for use on WANs.
Alien Crosstalk (AXT) As the signal rate increases in a cable, this form of crosstalk becomes more important. In Fact, this is a major source of interference, and a limiting factor, for running 10GBase-T (10Gbps) over UTP cabling.
Benjamin T. Cable was born in 1853.
Benjamin T. Cable died in 1923.
Although 10GBASE-T transmits & receives data on the same wires, it, like 1000BASE-T before it, implements echo cancellation so that the transmit & receives signals can occupy the cable at the same time without interference. This allows full duplex communication (i.e., transmit and receive at the same time) without collision.
10GBASE-T is the cheapest 10Gb and BASE-T is by far the most poplar on Gigabit and growing significantly on the 10Gb side. New adapters and reduced power LAN-on-Motherboard network controllers will continue to drive the adaption of 10GBASE-T.Twinax copper 10GBASE-T
Long Reach