一、56k Modem (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。56k Modem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,但是对于上网的速度可要有承受能力。 二、专线接入方式 主要指X.25分组交换网,帧中继网,数字 A, 56k Modem (you can say that you are still using the old cat) Modem transmission speed of 56kbps, to be able to achieve high-speed Internet Internet downloads on ordinary telephone lines. 56k Modem is an asymmetric transmission, which can download speeds up to 56kbps, the maximum upload rate of 33.6kbps. This is the general user access to the Internet, equipment and the cost of cheaper, but for the speed of the Internet can have affordability. Second, the main line access means X.25 packet switching network, frame relay network, digital