在过去的十几年中,家用电脑处理器的速度在以指数增长,而用户调制解调器的平均速度却增长缓慢。虽然电话与电缆公司已开始提供快速管道,但因其高昂的花销而未能得到广泛应用。电话线以高于56kbps的速度传送数据,这是调制解调器能达到的最高速度。电话公司新研制了一种高速网络 In the past decade or so, the speed of home computer processors has grown exponentially, while the average speed of subscriber modems has grown slowly. Although telephone and cable companies have begun to provide fast pipelines, they have not been widely used due to their high cost. Phone lines transmit data at speeds above 56kbps, the highest speed the modem can reach. The telephone company has developed a new high-speed network