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IEEE 802.3 10Base-5

10Base-5 is the classic version of a CSMA/CD bus system with baseband transmission and corresponds to Ethernet DIX 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 referred to as 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 m. 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.

Ethernet segment with transceivers and stations

Ethernet segment with transceivers and stations

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. Thus, the maximum distance between two stations is 2,500 m.

Maximum Ethernet Configuration with Local and Remote Repeaters

Maximum Ethernet Configuration with Local and Remote Repeaters

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.

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Englisch: IEEE 802.3 10Base-5
Updated at: 13.12.2018
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