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10Base2 Standard

Another topology is 10Base2, given this name in the IEEE 802.3 specification because it transmits at 10 Mbps over a baseband wire and can carry a signal about 200 metres (the actual distance is 185 metres, or 607 feet). This type of network uses thin coaxial cable, or thinnet, which has a maximum segment length of 185 metres (607 feet) and a minimum cable length of at least 0.5 metres (20 inches) between workstations. There is also a 30 computer maximum per 185 metre segment. We've already looked at some of the common components used with coaxial cable − thinnet cabling components include:

  • BNC barrel connectors
  • BNC T connectors
  • BNC terminators

Thinnet networks generally use a local bus topology. IEEE standards for thinnet do not allow a transceiver cable to be used from the bus T connector to a computer. Instead of this, a T connector fits directly on the NIC. A thinnet network is an economical way to support a small department or workgroup. The cable used for this type of network is:

  • Relatively inexpensive
  • Easy to install
  • Easy to configure

A single thinnet network can support a maximum of 30 nodes (computers and repeaters) per cable segment, as per the IEEE 802.3 specification.

Next: The 5-4-3 Rule in Thinnet