相信很多朋友還不知道電話拔電話的一個過程吧.我們平常看書也看的夠多了.但是一個比較真實的拔號過程還不清楚吧.那我在這裡介紹一個給你看看.相信你一看就會了解了.它是什麼樣的傳輸過程.我在這裡先抓兩張圖給大家看看吧.
       I believe many of my friends do not know a phone call the process of pulling it. We normally have to read enough to see. But a true dial-up process it is also unclear. That I would like to introduce to you a look at. I believe you will understand the look. It is what kind of transmission. I am grasping here first two plans to take a look at the bar.

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