The 10GbE interface 10GBase-KR is an interface for backplane Ethernet specified by IEEE 802.3ap. It is a 10 Gigabit interface for a point-to-point connection over the backplane PCB traces.
The link can span a distance of 1 m and operates at a data rate of 10.3125 GBaud. The interface works with autonegotiation and can thus exploit the highest possible data rate between the other interfaces1000Base-KX and 10GBase-KX4. It has 64B66B coding and differential output levels between 800 mV and 1.2 V.
Since known interconnect components are used in the interface, inter symbol interference( ISI) can occur and increase at higher frequencies. To reduce inter-symbol interference, the IEEE 802.3ap standardization group has also standardized Electronic Dispersion Compensation( EDC) and Feed-Forward Equalization (FFE) at 10GBase-KR. Both functions are implemented in the transceiver (XCVR) and reduce inter symbol interference.
Backplane Ethernet is particularly interesting for blade servers and backplane connections in other systems.