TOKEN RING WITH SECONDARY TRANSMIT OPPORTUNITIES

摘要

Stations on a token ring network use a "Secondary Transmit Opportunity" protocol to transmit information onto the ring. According to the protocol a ring station detecting an idle character immediately following an abort sequence or a physical trailer sequence on the ring may insert a message. Simultaneously, the ring station monitors an input bit stream to detect messages and tokens from upstream stations. If this condition is detected, the station aborts or continues transmission in accordance with a predefined message priority algorithm.