Ethernet Video Series


Episode 07, Segment 04 of 10

Ethernet Delivers the Internet (continued)


Think back now to our first movie in our Ethernet series, the Ethernet Tutorial. You’ll remember that that tutorial revealed that a lot of the design for Ethernet is based on the behavior of telegraph operators. Remember that as telegraph operations matured, the format for messages became standardized. As telegraph operators sent a message, the first part of each message was a description of the destination telegraph office: the destination address to receive the telegram. After the destination address, the telegram included the source address. In essence, each telegram started with a preamble that said something like, “Telegram to Salt Lake City, from Denver”. After those sections of a telegram identifying the receiving station, and the sending station, the main body of the text was transmitted.


Episode 07, Segment 05 of 10