Multiplex communications – Wide area network – Packet switching
Patent
1990-07-27
1994-01-18
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
34082505, H04L 1242
Patent
active
052804780
ABSTRACT:
A ring purging station for a token-ring network is disclosed. The station performs purging operations to remove no-owner frames and frame remnants from the network. The station begins a purging operation by detecting the token on the network and removing it. The station then begins stripping all frame and remnants of frames that it receives from the network, transmits one or more purge marker frames, and sets a purge operation timer to expire after a predetermined period of time. The predetermined period of time is greater than the maximum time required for a frame to propagate around the token ring network when the ring is not malfunctioning. The predetermined period of time may also be less than a valid transmission time period. When the station either detects one of the one or more purge marker frames it transmitted, or when the purge operation timer expires, the station ends the purging operation, and releases the token back onto the ring. The station is also capable of selecting, in cooperation with the other stations, which station is to operate as purging station. The station is further capable of performing duplicate address tests, and will terminate any purging operation upon detection of a duplicate address. In this way no-owner frames and frame fragments are removed from the network, while the ring is otherwise normally operating.
REFERENCES:
patent: 4468734 (1984-08-01), Lanier et al.
patent: 4507777 (1985-03-01), Tucker et al.
patent: 4567590 (1986-01-01), Bederman
patent: 4577313 (1986-03-01), Sy
patent: 4646232 (1987-02-01), Chang et al.
patent: 4789982 (1988-12-01), Coden
patent: 4932027 (1990-06-01), Geyer et al.
patent: 4941142 (1990-07-01), Kida
patent: 5053946 (1991-08-01), Jain
patent: 5142530 (1992-08-01), Geyer et al.
Pending application for U.S. patent Ser. No. 07/884,321, of Yang et al, filed May 11, 1992, originally filed Aug. 12, 1988, "Frame Removal Mechanism for Token Ring Networks".
Data Communications. vol. 13, No. 9, Aug. 1984, New York, N.Y., US, pp. 125-139; J. Bartik; "IBM's token ring: Have the pieces finally come together?"
National Telecommunications Conference, vol. 1, Dec. 1981, New Orleans, Lo., US. W Bux et al. "A reliable Token-Ring System for Local Area Communication" pp. A2.2.1-A2.2.1.
Ciarfella Paul W.
Ramakrishnan Kadangode K.
Yang Henry
Cefalo Albert P.
Chin Wellington
Digital Equipment Corporation
Johnston A. Sidney
Young Barry N.
LandOfFree
No-owner frame and multiple token removal mechanism for token ri does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with No-owner frame and multiple token removal mechanism for token ri, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and No-owner frame and multiple token removal mechanism for token ri will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1141102