一、56kModem　　（你可不要说你用的还是过去的老猫）传输速度为56kbps的Modem，能够在普通的电话线上实现Internet网上的高速下载。56kModem是一种非对称的传输方式，其下载速度可高达56kbps,上载最高速率为33.6kbps。这是一般用户所用的上网方式，设备及所需费用比较便宜， A, 56kModem (you can not say that you still use the old cat) Modem transmission speed of 56kbps, to be able to achieve high-speed Internet Internet downloads on ordinary telephone lines. The 56kModem is an asymmetric transmission that downloads up to 56kbps and uploads up to 33.6kbps. This is the general user access to the Internet, equipment and the cost of cheaper,