Adaptive data link protocol

Patent 4970714 Issued on November 13, 1990. Estimated Expiration Date:

January 5, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Method of administering local and end-to-end acknowledgments in a packet communication system
Patent #: 4527267
Issued on: 07/02/1985
Inventor: Cohen

Data communication system and method and communication controller and method therefor, having a data/clock synchronizer and method
Patent #: 4677614
Issued on: 06/30/1987
Inventor: Circo

Flow control scheme for a switching network
Patent #: 4677616
Issued on: 06/30/1987
Inventor: Franklin

Adaptive session-level pacing Patent #: 4736369
Issued on: 04/05/1988
Inventor: Barzilai , et al.

Inventors

Application

No. 294086 filed on 01/05/1989

US Classes:

370/216, FAULT RECOVERY370/471, Message having an address header714/748Request for retransmission

Examiners

Primary: Olms, Douglas W.
Assistant: Marcelo, Melvin

Attorney, Agent or Firm

Perman & Green

International Class

H04J 003/26

Abstract

A communication system provides high speed transmission of data over a link, such as a fiber optic link, between a first terminal and a second terminal. The architecture and protocol permits the use of dedicated hardware such as state machines constructed of programmable array logic units, to synchronize the transmission and reception of data packets and the retransmission of designated ones of these packets in the event of a faulty transmission. Packets to be transmitted and received are stored in an array of frames in sub-windows of a memory storage window in each of the termianls, the frame number being equal to the sequence number of the data packet. By embedding sequence and status bits in each packet within control words and bits appended to each packet, the state machine in each terminal can readily track the progress of each packet so as to request acknowledgement of error-free receipt, to send an acknowledgement, to request a retransmission of a packet designated by its serial number and to distinguish a retransmitted packet from an original packet transmitted with error.