Multiplex communications – Wide area network – Packet switching
Patent
1994-04-12
1995-05-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 855, 370 29, H04J 302, H04L 1228
Patent
active
054147000
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. Each station continually performs a two node test to ascertain whether there are only two active stations on the network, and updates a two node flag that indicates whether or only two active stations are present. The two node test uses both upstream neighbor and downstream neighbor addresses to update the two node flag, and requires validation of either one of these addresses if the other one of them appears to have changed since the previous observation. A concurrently running full duplex control process uses the two node flag and other conditions to decide whether to initiate or continue transition to full duplex mode. The control process uses an exchange of full duplex request and acknowledgment frames and completes the transition to full duplex mode when each station has transmitted and received a Restricted Token.
REFERENCES:
patent: 4747100 (1988-05-01), Roach et al.
patent: 5121382 (1992-06-01), Yang et al.
patent: 5155726 (1992-10-01), Spinney et al.
American National Standards Institute, ANSI X3.139-1987, 1987, New York, N.Y., "fiber distributed data interface (FDDI)-token ring media access control (MAC)".
American National Standards Institute, ANSI X3.148-1988, 1988, New York, N.Y., "fiber distributed data interface (FDDI)-token ring physical layer protocol (PHY)".
Proposed American National Standard, X3T9/92-067, X3T9.5/84-49, Rev. 7.2, Jun. 25, 1992, "FDDI Station Management (SMT)".
American National Standards Institute, ANSI X3.166-1990, 1990, New York, N.Y., "Fibre Data Distributed Interface (FDDI)-Token Ring Physical Layer Medium Dependent (PMD)".
Hawe William R.
Pariseau Luc A.
Spinney Barry A.
Yang Henry S.
Digital Equipment Corp.
Heal Noel F.
Johnston A. Sidney
Jung Min
Olms Douglas W.
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