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Token bus network

 
Computer Desktop Encyclopedia: token bus network
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A LAN access method that uses the token passing technology. Stations are logically connected in a ring but are physically connected by a common bus. All tokens are broadcast to every station in the network, but only the station with the destination address responds. After transmitting a maximum amount of data, the token is passed to the next logical station in the ring. The MAP factory automation protocol uses this method. See token passing.

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Token passing in a Token bus network

Token bus is a network implementing the token ring protocol 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 standardized by IEEE standard 802.4. It is mainly used for industrial applications. Token bus was used by GM (General Motors) for their Manufacturing Automation Protocol (MAP) standardization effort. This is an application of the concepts used in token ring networks. The main difference is that the endpoints of the bus do not meet to form a physical ring. The IEEE 802.4 Working Group is disbanded. In order to guarantee the packet delay and transmission in Token bus protocol, a modified Token bus was proposed in Manufacturing Automation Systems and flexible manufacturing system (FMS) [1].

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References

  1. ^ Hary Gunarto, An Industrial FMS Communication Protocol, UMI (Univ. Microfilms International), Ann Arbor, Michigan, 160 pp, 1988
v • d • e
Channel access methods and Media access control (MAC)/Multiple-access protocols
Channel based
OFDMA • WDMA • SC-FDMA
MF-TDMA • STDMA
W-CDMA • TD-CDMA • TD-SCDMA • DS-CDMA • FH-CDMA • OFHMA • MC-CDMA
 •
 •
Packet based
MACA • MACAW • CSMA • CSMA/CD • CSMA/CA • DCF • PCF • HCF • CSMA/CARP
Token ring • Token bus
Delay & disruption tolerant
Duplexing methods
TDD • FDD


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