This is cheapest because usually you have an extra on-board NIC and an extra port on your switch somewhere.

这是最便宜的，因为您通常会有一个额外的可用NIC和一个额外的端口。

youdao

The hardest part of designing a properly guarded switch is to fit all the traces on the board and maintain proper voltage spacing.

设计一个合适的保护开关的最难点是适合印制板上的所有布线，并保证适当的电压空间。

youdao

There is a switch board (control panel, distribution box) mounted on the wall.

在墙上装有一个开关板（控制盘、配电箱）。

youdao

"If you switch on a cellphone on board, and there's no network, it will gradually increase the power it's transmitting because it's trying to get hooked on a network which doesn't exist, " he said.

CNN: In-flight phone calls to become standard, say experts

As such, we'll continue to see N-Series handsets already in development pop with S60 on board alongside mass-market Maemo devices as the platform matures to the point that Nokia can make the full switch by 2012.

ENGADGET: Nokia abandoning S60 for Maemo on future N-Series devices?