1.
In the backplane interface standard (802.3ap) of 10GBASE-KR , 10G backplanes currently exist in parallel and serial versions.
Parallel (10GBASE-KX4) splits the 10G signal into 4 channels, and the rate of each channel is 3.125Gb/s (similar to XAUI, the full name of XAUI is: 10 Gigabit Attachment Unit Interface).
Serial (10GBASE-KR) defines a channel, using 64b66b encoding, and the rate is 10.3125Gb/s.
At present, there is a high demand for the total bandwidth or the need to solve the backplane with excessively high wiring density. Many chip suppliers provide SerDes chips with 10GBASE-KR solutions.
10GBASE-KR is mainly used for backplane applications, such as cluster line cards for blade servers, routers and switches. K represents backplane, R represents 64/66B encoding, and 10G represents communication speed. As a signal integrity engineer, he mainly The protocol requirements of concern are as follows.
1. Differential impedance requirement: 100ohm;
2. Encoding method: 64b66b;
3. Test pattern: PRBS11;
4. Passive channel requirements: Fa, IL, RL, ILD, ICR, PSXT.
2. XGMII: 10Gb, 64bit signal width, each with 32bit transceiver, connected to MAC and PHY
3、XAUI：3.125Gbps