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token ring
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token ring

Protocol for local area networks, developed by IBM in 1985. A token ring network operates by connecting computers together with copper-based wiring to form a large ring. One or many tokens (sequences of bits) then circulate around the ring continuously. When a computer transmits data it grabs a passing token and attaches the data and the destination address behind the token. The token then continues to circulate around the ring. Every computer on the ring checks every passing token to see if any attached data is addressed to it. When a computer finds a token with data addressed to it, it copies the data, and sets a special bit in the token to say that the data has been received successfully. When the token works its way back around the ring to the originating computer, the originator removes the data and frees up the token for use again. Token ring has been largely superseded by Ethernet as a LAN protocol.



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A real-time view of traffic on 4 or 16 Mb/s token ring networks is provided by the IBM Token-Ring Network 16/4 Trace and Performance Program and Adapters.
Hawatmeh, founder, president and CEO of CirTran, which acquired the Racore in 1998, said the order from the Air Traffic Business Unit of Lockheed Martin in Rockville, Maryland, was for its M8195 fiber optic PCI 16/4 token-ring network adapters.
18, 1998-- New RapidFire 3540 High Speed Token-Ring 100/16/4 PCI Adapter also Supports All Power Management Standards for Reduced Cost of Ownership Olicom (NASDAQ:OLCMF), a leading global supplier of high-performance networking solutions, today unveiled a triple-speed High-Speed Token-Ring network adapter that runs at 100 Mbps, 16 Mbps or 4Mbps, enabling future-proof investments in Token-Ring adapters.
 
 
 
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