An earlier local area network (LAN) access method developed by IBM. Conforming to the IEEE 802.5 standard, the Token Ring access method connects up to 255 nodes in a star topology at 4, 16 or 100 Mbps. All stations connect to a central wiring hub called the "Multistation Access Unit" (MAU) using twisted wire cable. Today, most Token Ring business networks have migrated to Ethernet.Different than EthernetThe Token Ring MAU may be a central hub, but it does not function like a shared Ethernet hub. Token Ring is more deterministic, which ensures that all users get regular turns at transmitting. With Ethernet, all users compete to get onto the network.Type 1 and Type 3Type 1 Token Rings allow up to 255 stations per network and use shielded twisted pair wires with IBM style Type 1 connectors. Type 3 allows up to 72 devices per network and uses unshielded twisted pair (Cat 3, 4 or 5) with RJ-45 connectors. Like Ethernet, Token Ring is a data link protocol and functions at layers 1 and 2 of the OSI model. See token passing, data link protocol and OSI model.
A local area network (LAN) technology invented in 1967 by Swedish inventor Olof Soderblom (1940