cable/connectors

10base2 (aka "thin ethernet") uses coaxial cable (rg 58) and bnc connectors.

BNC connectors:
1) T-Connectors are used to connect computers to the coax and the "end" of the computer cable must have a T-connector (for the last computer in the line) and a 50 ohm bnc terminator. The T-Connector should be grounded on one end (not both or the network will be slow).
2) Terminators (grounded and non-grounded).
3) BNC network adapters.

For more info and samples (and the 5-4-3 rule applies here)... see:

http://www.wown.com/j_helmig/thin.htm