10Giga bit Ethernet is simply the next protocol above 1000BaseT and is 10 times faster, 10 times
more bandwidth, higher performance. Using the same full duplex systems copper cabling delivers
bidirectional transmission rates at 250MHz per pair. Transmission Parameters already laid out by 1000BaseT are enough for the increase to 10Gb with only one extra test, i.e Alien Cross-talk.

Error detection

Ethernet works because of Error Detection Systems. If a system is noisy the error detection will retransmit the same information many times, slowing every transmission: there is a point at which the system will fail. 10G has the smallest safety (fail) margin.

Margin

In standardization the margin is built in to ensure plug and play works first time. The margin is steadily becoming smaller, 10G is almost non–existent, as the error detection systems cannot work above
a certain noise level. As bandwidth increases so does noise. The minimum cabling standard is the lowest minimum possible, and can always be better which is Draka’s intention.

Source: Draka UC Data Cable brochure