Ø（单点接地）The external shield, and the shields of all connectors, should be connected together. This external ground should be connected to the ground plane of the PCB at only one point; this avoids large current through the ground plane of the PCB. If the connectors are mounted on the PCB, the outer perimeter of the PCB should contain a strip of copper connecting to the shields of the connectors. There should be a break in copper between this strip, and the main ground plane of the circuit. The two should be connected at only one point. This way, if there is a large current between connector shields, it will not pass through the ground plane of the circuit. Ø（星形连接）A star topology should be used for ground distribution, avoiding loops. Ø（功率器件靠近电源）Power devices should be placed closest to the power supply, while low-power devices can be placed further from it. Ø（差分信号传输）Signals, wherever possible, should be differential. Use differential signaling.
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