Patent ID: 6292470
Filing Date: 2001-09-18
Classification: H04L

Abstract:
A data transmission system for transmitting packetized data between connected data terminals, wherein frames of data are transmittable in packets, each including a flag sequence field for delimiting a frame, a forward information field containing a frame-number for identifying a frame, a backward information field containing a history of received frame-numbers of correctly received frames, an information field containing data and an error-detection field for detecting an error of the received frame, and wherein one of the data terminals checks the error-detection field of a received frame and, if no error is detected, adds the number of the correctly received frame to the history of the received frame-numbers and sets the updated history information in the backward information field of a frame to be transmitted to the other terminal or, if an error is detected, does not add the number of the error frame to the history of frame-numbers and sets precedent history information in the backward information field of the frame to be transmitted to the other terminal.