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7.1 | |
10-Mbps and 100-Mbps Ethernet | |
| 7.1.3 | |
10BASE2 |
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10BASE2 was introduced in 1985.
Installation was easier because of its smaller size, lighter weight,
and greater flexibility. It still exists in legacy networks. Like
10BASE5, it is not recommended for installations in networks today. It has a low cost and a lack of need for hubs. Again, NICs are also difficult to obtain for this medium.
10BASE2 also uses Manchester encoding. Computers on the LAN were linked together by an unbroken series of coaxial cable lengths. These lengths were attached by BNC connectors to a T-shaped connector on the NIC. 10BASE2 has a stranded central conductor. Each of the maximum five segments of thin coax may be up to 185 meters long and each station is connected directly to the BNC “T” connector on the coax. Only one station can transmit at a time or else a collision will occur. 10BASE2 also uses half-duplex. The maximum transmission rate of 10BASE2 is 10 Mbps. There may be up to 30 stations on any
individual 10BASE2 segment. Out of the five consecutive segments in
series between any two distant stations, only three may have stations
attached.
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