| 摘要 |
In a digital network system, such as an ISDN (Integrated Service Digital Network) system, a data link is established between transmit-side and receive-side stations so that a data transfer is performed on a public telephone line in accordance with a predetermined protocol. The transmit-side station compresses (12) data read from a first storage medium and then transfers the compressed data to the receive-side station, whereas the receive-side station expands (17) the compressed data and then writes it into a second storage medium. Before transferring the compressed data, the transmit-side station transmits a data transfer request to the receive-side station, so that if the receive-side station is ready to receive the compressed data, the transmit-side station transfers the compressed data to the receive-side station. On the other hand, when completing a data transfer, the transmit-side station transmits an end request of data transfer to the receive-side station, so that if the receive-side station is in a state to respond to a data transfer completion, the data link formed between the transmit-side and receive-side stations is terminated. Preferably, each storage medium is a floppy disk. <IMAGE>
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