NationMaster - Encyclopedia: Token bus

Token bus is token ring over a virtual ring on a coaxial cable. A token is passed around the network nodes and only the node possessing the token may transmit. If a node doesn't have anything to send, the token is passed on to the next node on the virtual ring. Each node must know the address of its neighbour in the ring, so a special protocol is needed to notify the other nodes of connections to, and disconnections from, the ring. Token bus was used by GM (General Motors) for their Manufacturing Automation Protocol (MAP) standardisation effort.

Results from FactBites:

Token Bus Network (Linktionary term) (359 words)
	A token bus network is similar to a token ring network in that a station must have possession of a token before it can transmit on the network (see "Token and Token-Passing Access Methods").
	Token bus topology is well suited to groups of users that are separated by some distance.
	IEEE 802.4 token bus networks are constructed with 75-ohm coaxial cable using a bus topology.

Token Bus and Token Ring (518 words)
	Token Bus was a 4 Mbps Local Area Networking technology created by IBM to connect their terminals to IBM mainframes.
	Token Ring was created by IBM to compete with what became known as the DIX Standard of Ethernet (DEC/Intel/Xerox) and to improve upon their previous Token Bus technology.
	Token Ring uses a ring based topology and passes a token around the network to control access to the network wiring.

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