Abstract: A method of, and a system for, transmitting and/or storing data in digitized form, in particular image data, between two telecommunication stations connected through a cable. The data is supplied, in a suitable form, to a computer and stored in at least a first memory section of the computer. A corresponding second memory section of the computer is defined, in which reference data is stored. Periodically and simultaneously both memory sections are scanned to compare the contents of corresponding memory locations. When a difference between the contents of corresponding memory locations of the two memory sections is detected, the contents of the memory location of the first memory section together with address data are transmitted and/or stored, and also written into the corresponding memory location of the second memory section to update the reference data.