Method and apparatus for maintaining a dynamic logical ring in a

Details Method and apparatus for maintaining a dynamic logical ring in a Method and apparatus for maintaining a dynamic logical ring in a

1985-11-27

1987-07-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3408255, H04J 326

Patent

active

046823263

ABSTRACT:
Method and apparatus are provided for maintaining a dynamic logical ring in a token passing local area network wherein a plurality of bus interface units (BIUs) exchange information in accordance with a token passing protocol. A network control center is provided for monitoring the transmission medium of the network for transmission of a media demand signal, wherein said media demand signal indicates that a station wishes to be added to the logical ring. The network control center is responsive to the media demand signal for determining a predecessor and successor to the entering station and, thereafter, transmitting media entrance signals to add the entering station to the logical ring. To this end, one media entrance signal is transmitted to the predecessor of the entering station to inform the predecessor to transmit the token to the entering station and another media entrance signal is transmitted to the entering station to inform the entering station to transmit the token to its successor. The network control center is also adapted to monitor the transmission medium to determine when a station has received the token and then failed. Upon making such a determination, the network control center will transmit message signals to remove the failed station from the logical ring.

REFERENCES:
patent: 4058681 (1977-11-01), Imaizumi
patent: 4491946 (1985-01-01), Kryskow, Jr. et al.
patent: 4494233 (1985-01-01), Bahr et al.
patent: 4506360 (1985-03-01), Kryskow, Jr. et al.
patent: 4507777 (1985-03-01), Tucker et al.
patent: 4583088 (1986-04-01), Bux et al.
patent: 4593280 (1986-06-01), Grow
patent: 4609920 (1986-09-01), Segarra

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