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US 6,151,627 AGranted
Monitoring of a communication link utilizing history-based compression algorithms
Assignee3Com Technologies
InventorsRichard McBride, Stuart J. Boutell
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Assignee3Com Technologies
InventorsRichard McBride, Stuart J. Boutell
Estimating the term…
The invention concerns in-line monitoring of a communication link between two stations in a frame-based communication network wherein the said two stations employ a compression algorithm for the transmission of frames and a corresponding decompression algorithm for the reception and decompression of the frames, the said algorithms requiring the maintenance at a transmitting station of a compression history in terms of the number of frames transmitted since a datum point and the maintenance of a corresponding compression history at a receiving station in terms of the number of frames received, the frames each including an identification of the compression sequence so that the receiving station can detect mismatch between the compression sequence and the receiving sequence. The monitoring method comprises detecting frames transmitted from one of the stations to the other, detecting whether frames are compressed, decompressing compressed frames and maintaining a compression history corresponding to that maintained by the receiving station.
A method of monitoring a communication link between two stations in a frame-based communication network wherein the said two stations employ a compression algorithm for the transmission of frames and a corresponding decompression algorithm for the reception and decompression of the frames, the said algorithms requiring the maintenance at a transmitting station of a compression history in terms of the number of frames transmitted since a datum point and the maintenance of a corresponding compression history at a receiving station in terms of the number of frames received, the frames each including an identification of the compression sequence so that the receiving station can detect mismatch between the compression sequence and the receiving sequence, the monitoring method comprising detecting frames transmitted by way of the link, detecting whether frames are compressed, decompressing compressed frames and maintaining in a monitor a compression history corresponding to that maintained by the receiving station.
A monitor for monitoring a communication link between two stations in a frame-based communication network wherein the said two stations employ a compression algorithm for the transmission of frames and a corresponding decompression algorithm for the reception and decompression of the frames, the said algorithms requiring the maintenance at a transmitting station of a compression history in terms of the number of frames transmitted since a datum point and the maintenance of a corresponding compression history at a receiving station in terms of the number of frames received, the frames each including an identification of the compression sequence so that the receiving station can detect mismatch between the compression sequence and the receiving sequence and to provide a first signal in response to that mismatch and wherein a transmitting station provides in response to said first signal an acknowledgement signal connoting reset of the compression histories, the monitor comprising means for detecting frames transmitted from the transmitting station to the receiving station, means for detecting whether frames are compressed, means for decompressing compressed frames and means for maintaining a compression history corresponding to that maintained by the receiving station, the last-named means being arranged to respond to said acknowledgement signal to reset said compression history in the monitor.
Dependencies are inferred from the claim text.