Data communications system.

摘要

The present invention relates to a data communications system comprising a sender (1) including means (18) for transmitting blocks of data and for receiving acknowledge messages, a transmission link (34) coupled to the sender for communication of data and messages, and a receiver (2) coupled to the transmission link. According to the invention the communications system is characterised in that the receiver comprises at least two buffers (44, 46, 48, 50), and means for transmitting an acknowledge message when received data is cleared from a buffer and such buffer is ready to receive data, and in that the sender comprises means (18) for transmitting a block of data only when the sender determines, by counting the acknowledge messages received, that the receiver has at least one buffer ready to receive data.