Access control method for DQDB network

Details Access control method for DQDB network Access control method for DQDB network

1990-03-09

1992-06-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, 370 859, 370 856, 3408255, H04J 302

Patent

active

051249812

ABSTRACT:
A distributed queue dual bus (DQDB) network has two, oppositely-directed, unidirectional busses. A node with data to send on one bus, can request access to that bus, by sending a bus request signal to all nodes upstream on the bus. The bus request signal is sent to the nodes as part of the traffic flowing on the second bus. Each node counts the number of successive bus request signals transported on the second bus. In a multiple priority system, multiple counts are maintained, one for each priority level. When a given or local node detects an idle slot on the first node, it may write data into that slot if there are no pending downstream access requests of higher priority and if the local node has allowed enough idle slots to pass since its last write operation to service access requests existing at the time of that operation at the same or higher priority levels.

REFERENCES:
patent: 4701910 (1987-10-01), Ulug
patent: 4718061 (1988-01-01), Turner
patent: 4922244 (1990-05-01), Hullett et al.
patent: 4977557 (1990-12-01), Phung et al.
patent: 5001707 (1991-03-01), Kositpaiboon et al.
patent: 5051742 (1991-09-01), Hullett et al.

Affiliated with

Also associated with

Rating

Access control method for DQDB network does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Access control method for DQDB network, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Access control method for DQDB network will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-939148