token ring

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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 ?
The card is based on the IBM Token Ring chipset, ensuring compatibility and interoperability with all IBM Token Ring networks.
The system handled such high-speed applications as LAN interconnection, IBM token ring traffic, mainframe access and connections to a DEC VAX system.
3 or higher; supports Novell, IBM Token Ring and Ethernet; HP and compatible laser printers and Fast Tax Formwriter.
The new Madge Token Ring network co-exists with the current IBM Token Ring hub infrastructure with all 30 file servers connected with 100Mbps Token Ring.
Particularly daunting is the task of economically integrating remote sales offices into the information flow of the company's central-site IBM token ring LAN in Mission Viejo, Calif.
Hit List not only supports IBM's leading database platform -- DB2 Universal Database -- but also provides support for IBM Token Ring networks.
sites, and two 6292 T1 fast packet switches are used at headquarters to test IBM token ring LANs.
Fully compatible with the IBM Token Ring network, the MAU 8216 Plus may be used alone or in conjunction with other IBM MAUs.
IBM compatibility is assured through the use of the IBM Token Ring chipset.
LanOptics' strong focus on the IBM Token Ring environment resulted in the development of a unique technology, Jitter Watch, which compensates for the signal attenuation and degradation caused by older and lower grade cables.
We view the NTR family as the perfect marriage of IBM Token Ring technology and Novell NetWare," said Mary Burnside, executive vice president of Novell's Corporate Services Group.