From a Cisco Live presentation DCT-3860:
Cisco is developing a new 40nm 10GBaseT PHY process to replace current 65nm silicon process in the next generation of Nexus 2200 FEXen.
10GBaseT – 40nm PHY
- IEEE 802.3.an standard
- Structured Copper Cabling with RJ45 connectors
- Supports 10Gbps throughput for up to 100 meters or 330 feet
- Leverages Category 6, Category 6A, and Category 7 type cabling
What is different with 40m?
- Better BER characteristics expected – qualification underway
- Modest reduction in power consumption
- FCoE Qualification is planned (not complete)
I find these kinds of facts fascinating. The improved BER is likely the source of the FCoE qualification since FC is not robust in the face of the poor Bit Error Rates. FC has no error recovery and assumes that BER of 10^-12 is minimum. 10GBaseT doesn’t achieve that easily.