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Ordered Access Protocol for Communication Channels

IP.com Disclosure Number: IPCOM000043520D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-04

Publishing Venue

IBM

Related People

Authors:
Closs, R Recknor, L Rothauser, E [+details]

Abstract

An access protocol is suggested that provides ordered and guaranteed access to a common channel for a number of stations. The common channel may be implemented as a bus, a ring or in any other suitable form. The access mechanism is completely decentralized. After the end of each transmission, a sequence of access slots begins by starting a slot counter in each station. Each access slot is assigned to a single station, and a station can start transmission of a message only during its own assigned access slot when the channel is still idle. Start of a transmission stops the counters in all stations. At the end of transmission, all slot counters are reset and start again. A station that transmitted a message or packet must not start another transmission before all other stations had an opportunity to transmit.