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拨号上网什么意思？什么是拨号上网？

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　　许多用户在连接宽带的时候一般有两种方法，一种是连接宽带后直接上网，一种是需要拨号才能上网，那么拨号上网是什么，又是什么意思呢？下面小编就带着大家一起具体来看看吧！

　　拨号上网就是用户使用一台个人电脑、一个外置或内置的调制解调器（Modem）和一根电话线，再向本地ISP供应商申请自己的账号，或购买上网卡，拥有自己的用户名和密码后，然后通过拨打ISP的接入号连接到Internet上。

　　宽带并没有很严格的定义。从一般的角度理解，它是能够满足人们感观所能感受到的各种媒体在网络上传输所需要的带宽，因此它也是一个动态的、发展的概念。

　　扩展资料

　　宽带网络可以分为三大部分：传输网、交换网、接入网。宽带网的相关技术也分为3类：传输技术、交换技术、接入技术。

　　宽带传输网主要以SDH（同步数字系列）为基础的大容量光纤网络；

　　宽带交换网是采用ATM（异步传输模式）技术的综合业务数字网；

　　宽带接入网主要有光纤接入、铜线接入、混合光纤/铜线接入、无线接入等。

　　网吧宽带，就是指所有的电脑都由电话局那端传到网吧的上网代理软件的主机里，由网吧主机统一分配网络到网吧的计费主机中。由计费机给各个电脑计费。

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  9. 运行时间: 4.0901
  10. 内存开销: 1.08 MB
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