4.1.Principles of Ethernet
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The genesis of Ethernet was 1972, when this technology was developed by Xerox Corporation.
The original intent was to create a technology to allow computers to connect with laser printers.
A quick survey of most any corporate network reveals that Ethernet rose well beyond its humble beginnings, with Ethernet being used to interconnect such devices as computers, printers, wireless access points, servers, switches, routers, and more.
In the network-industry literature, you might come upon the term IEEE 802.3 .In general, you can use the term IEEE 802.3 interchangeably with the term Ethernet .
A popular implementation of Ethernet, in the early days, was called 10BASE5 .
This network type became known as thicknet .
The 10 in 10BASE5 referred to network throughput, specifically 10 Mbps .
The BASE in 10BASE5 referred to baseband, as opposed to broadband.
The 5 in 10BASE5 indicated the distance limitation of 500 meters.
The cable used in 10BASE5 networks is shown in Figure below.
Another early Ethernet implementation was 10BASE2.
From the previous analysis of 10BASE5, you might conclude that 10BASE2 was a 10-Mbps baseband technology with a distance limitation of 200 meters.
That is almost correct. However, 10BASE2’s actual distance limitation was 185 meters.
The cabling used in 10BASE2 networks was significantly thinner and therefore less expensive than 10BASE5 cabling.
As a result, 10BASE2 cabling, as shown in Figure below , was known as thinnet or cheapernet .
