Multiplex communications – Channel assignment techniques – Carrier sense multiple access
Patent
1996-05-01
1998-06-23
Kizou, Hassan
Multiplex communications
Channel assignment techniques
Carrier sense multiple access
370448, 370501, H04L 12413
Patent
active
057712352
ABSTRACT:
A scalable CSMA/CD repeater is based on polling and collision resolution logic, and slot time and interframe gap negotiation logic controlled by the repeater itself. The repeater based polling and collision resolution provides central control of the backoff and retry algorithm of each connected MAC unit. Thus, the MAC unit does not rely on random backoff mechanisms that significantly degrade performance of prior art systems. Furthermore, the retry by a MAC unit after a collision is managed by commands received from the collision resolution logic in the repeater. The repeater based collision resolution logic ensures that all ports involved in a collision have a fair opportunity to forward a packet without being blocked before enabling all the ports in the network to freely compete again. Furthermore, the negotiation of slot time and interframe gap allows for tight control of delay parameters in the network which are involved in collision resolution and scaling of the technology with increasing MAC unit processing speeds.
REFERENCES:
patent: 4606023 (1986-08-01), Dragoo
patent: 4776041 (1988-10-01), Husbands
patent: 5355375 (1994-10-01), Christensen
patent: 5436617 (1995-07-01), Adams et al.
"Local and Metropolitan Area Networks--8023 Supplements," IEEE Standards for Local and Metropolitan Area Networks 802.3u, pp. 203-233, Oct. 26, 1995.
Sherer W. Paul
Tang Wen-Tsung
3Com Corporation
Haynes Mark A.
Kizou Hassan
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