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10Base5
Originally thick RG-6 50 ohm (.77 NVP) cable up to 500m long, terminated on both ends and up to 100 nodes, 2.5 m apart minimum.
Notes:
From http://www.faqs.org/faqs/LANs/ethernet-faq and http://www.ethermanage.com/ethernet/enet-faqs/ethernet-faq.html
10Base5 is limited to a maximum of 100 network devices per unrepeated segment, with a minimum distance of 2.5m (8.2ft) between taps/T's (usually indicated by a marker stamped on the cable itself every 2.5m).
AUI signaling was 1.4 V P-P +0.7VDC to -0.7VDC differential, manchester encoded on the wire at 20 MHz, 0 to plus and minus 2.5 VDC differential. Manchester encoding was used for all 10Base standards.
10BASE5 is the original Ethernet backbone, and is occasionally referred to as thicknet or thick Ethernet because of the thick 50 ohm coax that was used as the physical medium. 10BASE5 is a bus topology that uses transceiver cables to attach stations to the central 10BASE5 cable. Maximum segment length: 500 meters Maximum number of segments connected with repeaters: 5 (2500 meters) Maximum attachments per segment: 100 Minimum separation between attachments: 2.5 meters