Notes:
From http://www.faqs.org/faqs/LANs/ethernet-faq and http://www.ethermanage.com/ethernet/enet-faqs/ethernet-faq.html
10BASE2 is designed as a smaller and less expensive alternative to 10BASE5, and is sometimes referred to as Thinnet or Thin Ethernet because of the much smaller cables. 10BASE2 is also a bus topology, but each of the workstations use a 'T' BNC connector to connect workstations to the central bus. Maximum segment length: 200 meters Maximum number of segments connected with repeaters: 5 (1000 meters) Maximum attachments per segment: 30 Minimum separation between attachments: .5 meters 10BaseF depends on the signaling technology and medium used but can go up to 2KM.
10Base2 (thin Ethernet or Cheapernet) is the least expensive way to cable an Ethernet network. However, the price difference between 10Base2 and 10BaseT (Ethernet over UTP) is rapidly diminishing. Still, for small, budget-conscious installations, 10Base2 is the most economical topology. The disadvantages of 10Base2 is that any break in the cable or poor connection will bring the entire network down, and you need repeaters if you have more than 30 devices connected to the network or the cable length exceeds 185 meters (607 feet).