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10BASE2 is technical name for Ethernet, thinnet coaxial cable and  is a variant of Ethernet that uses thin coaxial cable terminated with BNC connectors to build a local area network.

During the mid to late 1980s this was the dominant 10 Mbit/s Ethernet standard, but due to the immense demand for high speed networking, the low cost of Category 5 cable, and the popularity of 802.11 wireless networks, both 10BASE2 and 10BASE5 have become increasingly obsolete, though devices still exist in some locations. As of 2011, IEEE 802.3 has deprecated this standard for new installations.

10 Mbit/s Ethernet uses Manchester coding. A binary zero is indicated by a low-to-high transition in the middle of the bit period and a binary one is indicated by a high-to-low transition in the middle of the bit period. Manchester coding allows the clock to be recovered from the signal. However, the additional transitions associated with it double the signal bandwidth.

IEEE Standard 802.3a. Variant of Ethernet that uses Thinnet coaxial cables.

10 stand for transmission speed in Mega bits per second. 10Mbps.

Base stands for Baseband signal technology. Baseband means single type/frequency of signal on wire.

Cable type: 
Coaxial cable. 50-ohm resistance.  Also called Thinnet or Cheapnet. 10BASE2 uses RG(Radio Guide)-58A/U (U means General Utility Use).

Cable width: 0.5cms approx

Connectors used: BNC (Bayonet Neill–Concelman) Connector. Each end of cable has BNC connector with built in 50ohm resistor.

Lenth: Maximum supported length is 185 metres (607 ft). Approximately 200meters. The numeral 2 in 10Base2 is taken from this (Length 200meters approx)

Topology type: Bus Topology.

Year of Development :  1985

Inventor of the cable: Oliver Heaviside invented coaxial cable in 1880

T Connector

Bus Topology