token ring

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Related to token ring: Token Bus, Token ring connector

token ring

A computer local area network arbitration scheme in which conflicts in the transmission of messages are avoided by the granting of "tokens" which give permission to send. A station keeps the token while transmitting a message, if it has a message to transmit, and then passes it on to the next station.

Often, "Token Ring" is used to refer to the IEEE 802.5 token ring standard, which is the most common type of token ring.

Usenet newsgroup: news:comp.dcom.lans.token-ring.

Token Ring

A local area network (LAN) access method developed by IBM. Conforming to the IEEE 802.5 standard, Token Ring uses a token ring access method and 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 all Token Ring business networks have migrated to Ethernet.

Different than Ethernet
The Token Ring MAU may be a central hub, but does not function like a shared Ethernet hub. The Token Ring method is more deterministic and ensures that all users get regular turns at transmitting their data. With Ethernet, all users compete to get onto the network.

Type 1 and Type 3
Type 1 Token Ring networks allow up to 255 stations per network and use shielded twisted pair wires with IBM style Type 1 connectors. Type 3 Token Rings allow up to 72 devices per network and use unshielded twisted pair (Category 3, 4 or 5) with RJ-45 connectors.

Like Ethernet, Token Ring is a data link protocol (MAC layer protocol) and functions at layers 1 and 2 of the OSI model. See data link protocol and OSI.

Token Ring Topology
Token Ring uses a logical ring topology, which provides more equal opportunity for each station to gain access to the network than the broadcast method used by Ethernet. All nodes connect to the MAU.

References in periodicals archive ?
Pre-orders are currently up for the Token ring (in United States sizes of 6 to 12) and it will cost early adopters $249 a piece.
Combined with the Madge AccessSwitch switch, which enables high speed video calls over ISDN, the Madge LAN Video Gateway for Token Ring delivers high quality LAN/WAN conferencing and connection to existing video equipment.
The company is also at the forefront of developments in High Speed Token Ring (HSTR) technology, and is a founding member of the HSTR Alliance.
Our Token Ring roadmap delivers cost effective and high performance Token Ring products with advanced multi-network integration options," commented Simon Drennan, Director of Marketing at Madge Networks.
This joint testing brings Madge Networks' versatile solution to the zSeries 900 platform - giving our customers more choices in increasing Token Ring capacity and flexibility - and extends the benefits of OSA-Express to both TCP/IP and SNA users," said Terri Virnig, director, IBM eServer zSeries Product Marketing.
connect is pioneering next generation networking solutions, which enable the painless deployment of 100Mbps and Gigabit speed IP-based applications within existing corporate networks while protecting customers' investments in Token Ring.
connect's commitment to delivering next-generation solutions that enable all Token Ring customers to benefit from switching, Gigabit networking and integration with Ethernet whilst maintaining the business benefits of their Token Ring workgroups.
connect has enabled us to upgrade our existing Token Ring network with ease - and thanks to the flexibility of their solution, our in-house MIS staff carried out the entire implementation to a tight schedule.
Today, Racore Technology designs, develops, manufactures, and markets high-performance Local Area Network products with emphasis on Fiber Optics, Token Ring and 10/100 Ethernet technologies.
CompUSA's internal business will benefit from increased bandwidth and faster response times as it upgrades from a shared Ethernet and token ring environment to a switched 10/100 Ethernet environment with Alcatel's Omni Switch/Router.
connect's ongoing strategy to deliver next generation solutions that allow Token Ring customers to easily deploy and manage IP-based applications at up to Gigabit speeds.
connect's commitment to delivering state of the art Gigabit solutions for all Token Ring users.