1. Chapter 5 - The Once And Future Digital Network Introduction The World Was Once Digital A Telegraph Is Digital [The telegraph is a digital technology because it transfers discrete clicks instead of a continuously varying signal] Morse Code (International Morse Code) Letters And Digits In Morse Code

2. Chapter 5 - The Once And Future Digital Network Users Did Not Encounter Morse Code –It is possible to encode all letters and digits using only two basic code values: dot and dash –A code used for message transmission defines a basic alphabet of characters that can be sent; the code can be useful even if it does not include all possible characters. –A customer of a telegraph service never encountered or understood the underlying encoding scheme. Virtually Instant Communication Speed Is Relative The Telephone Became Digital

3. Chapter 5 - The Once And Future Digital Network Relevance To The Internet Binary Encoding Of Data On The Internet –Although the Internet uses a binary encoding for all data transferred, users usually remain completely unaware of the encoding. Why Use Two Symbols? Terms –binary digit (bit) –binary encoding