SMS, QQ, etc. Why do you get it when you send it?

Short messages send signals to the base station through electromagnetic waves, and the base station transmits information to the nearest base station. After being received by the other party's mobile phone, the mobile phone translates the electromagnetic signal into corresponding words. The speed of electromagnetic waves is close to the speed of light, 3* 10∧8m/s, which is of course very fast.

After QQ is converted into IP, there will be a network destination. Then the switch is responsible for the transmission. If it is not the same network segment, the router will repackage your packet and forward it to other network segments. Now all data is transmitted through optical fiber. You can understand its speed when you see the light character (*/Ω \ *).