Multiplex communications – Wide area network – Packet switching
Patent
1990-01-22
1992-10-13
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 29, 34082505, H04J 302
Patent
active
051557266
ABSTRACT:
A technique for establishing and maintaining full duplex communication between two stations connected to a token ring network, without physically reconfiguring the station connections or otherwise disturbing the network. In an auto-configuration full duplex mode of operation, each station ascertains whether there are only two active stations on the network and, if so, performs an exchange of frames with the other station to establish full duplex communication. One way to ascertain whether only two stations are active is for each station to transmit periodically a neighbor information frame, which contains the indentities of the source station and the source station's nearest upstream neighbor. Once established, full duplex communication can proceed at a greater bandwidth than communication in a token ring network, and without latency delays and distance limitations associated with token ring networks. Periodic checks are made by each station in full duplex communication, to ascertain if the other station is still participating or if any third station has become active. In either case, stations in the auto-configuration mode revert to token ring mode automatically. In a variant form of the invention, stations can operate in a fixed full duplex mode, in which the detection of tokens or third stations are merely reported and do not necessarily result in reversion to the token ring mode.
REFERENCES:
patent: 4451827 (1984-05-01), Kahn et al.
patent: 4491946 (1985-01-01), Kryskow, Jr. et al.
patent: 4542502 (1985-09-01), Levinson et al.
patent: 4556974 (1985-12-01), Kozlik
patent: 4653044 (1987-03-01), Kudo
patent: 4675671 (1987-06-01), Ishizuka et al.
patent: 4736465 (1988-04-01), Bobey et al.
patent: 4817087 (1989-03-01), Yamada
patent: 4926418 (1990-05-01), Cidon et al.
Hawe William R.
Spinney Barry A.
Yang Henry S.
Digital Equipment Corporation
Johnston A. Sidney
Jung Min
Mesaros John G.
Myrick Ronald E.
LandOfFree
Station-to-station full duplex communication in a token ring loc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Station-to-station full duplex communication in a token ring loc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Station-to-station full duplex communication in a token ring loc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1306594