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前言
2020年5G越来越火热,而且运营商多次推出免费宽带升级,免费升级到100M,20M升级50M等等。很多人疑惑
我们平时的下载速度也就几百K或者有时候能上1M,但是就算升级到10M的宽带,也从来没有出现过下载速度达
到10M的情况,这是为什么?
这里分享下经验,讲解下宽带和下载速度的区别。
首先,运营商所说的几M的宽带和我们理解的下载速度是2个不同的概念。我们所说的比如下载速度1M即1024K,
这里的单位是字节(Byte),也就是说下载速度1M,就等于是1024K 的Byte。而运营商的几M的宽带,
单位是比特(bit),就是说10M宽带实际上是指10M的bit,也是10*1024K的bit。而1个字节(Byte)等于8个比
特(bit)。我们要把运营商的宽带换成我们所说的下载速度就要把宽带除以8。
那么10M的宽带实际上的速率是多少呢? 10M/8=1.25M。就是说,家里装了10M宽带,理论上的下载速度可
以达到1.25M/秒。
当然,上面说的这些是理论值,实际上则要再扣约12%的Ethernet Header, IP Header, TCP Header, ATM Header
等控制讯号,故其传输速度上限应为169KB/sec左右。
所以,对于实际的连接速度可以通过下载文件的方法来测试,看看离理论值有多远,另外有一些网速测试网站,也
可以测试家中正在使用的宽带服务质量。
基础知识
电脑中数据占储存器的容量的单位是Byte(字节),即硬