CS100 Lecture Notes - Lecture 2: Cable Modem, Radio Wave, Wi-Fi
27 Mar 2018
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Document Summary
Synchronous communication vs. asynchronous communication: synchronous, asynchronous delivering a message is not done on a particular schedule i. e. how the internet works (communication- not texting in real time, time post for a text) Communication layers: when a message arrives goes from high layers of communication to low lowers of communication, protocols- specific rules/ guidelines to deliver a message, every layer of communication has a set of protocols, computer protocol- a form . 802. 11g) different standards of wifi, different frequencies: closer to ethernet than a cable modem, cellular (3g/lte) Use electromagnetic radiation frequencies are different. 3g- 3rd generation became long term evolution (lte) (more 3 and a half. Range can be km, go through cell tower, large km rangers involved in noisier environments require more power from phone signal to the tower is much greater. Prefer wi-fi to 3g is more cost effective and saves battery power. Cellular carrier requires more power, drain battery, charge more.
