In a digital network system, such as 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 onto a public telephone line in accordance with a predetermined protocol. The transmit-side station compresses...http://www.google.se/patents/US5282208?utm_source=gb-gplus-sharePatent US5282208 - Data transfer system and method
