IEEE 802.3 10Base-5
10Base-5 is the classic version of a CSMA/ CD bus system with baseband transmissionand corresponds to EthernetDIX V.2, standardized by IEEE 802.3. 10Base-5 corresponds to the original Ethernet. The transmission medium used in 10Base-5 was a thick, rather bulky coaxial cable, the Yellow Cable. Therefore, this Ethernet variant is also called Thickwire Ethernet.
The 802.3 working group specified various boundary conditions for the 10Base-5 Ethernet interface. For example, a LAN segment including all transceiver cables must not be longer than 500 meters. In addition to the length limitation, the number of connectable stations is also limited to a maximum of 100 transceivers( MAU), with a minimum distance of 2.5 m between the transceiver connections. With a minimum signal propagation speed of 0.77c, this results in a propagation delay of no more than 2,165 ns. An AUI cable may not be longer than 50 m; with a minimum signal running speed of 0.65c, this results in a maximum propagation delay of 257 ns.
Between two stations there may be a maximum of five LAN segments and four repeaters, including the "own" segments; of the LAN segments, however, only three segments may be coaxial segments. The other LAN segments result from the max. 1,000 m long point-to-point connections between the remote repeaters. So the maximum distance between two stations is 2,500 m.
10Base-5 systems have Logical Link Control( LLC), DIX-V.2 systems do not. There are also differences in electrical signaling. As a result, 10Base-5 and V.2 stations coexist on the same coaxial cable but cannot send messages to each other.