电力是这么无所不在,这么便宜,并且一般又那么可靠,以致我们大多数人简单地认为用电是理所当然的事。而长时间电力中断是有新闻价值有事件。但是当你正建设或重建一个传送话音、视频和数据业务到用户的网络时,电力成为第一号重要的事,并且是任何网络工程师最上心的事。 Electricity is so ubiquitous, so cheap, and generally so reliable that most of us simply assume that electricity is taken for granted. Long time power outages have newsworthy events. But when you are building or rebuilding a network that delivers voice, video and data services to your users, power is the number one priority and is where most network engineers are focused.