Abstract: An apparatus for transforming digital data into encoded digital data describing analog signals representing the digital data. The apparatus comprises a CPU, memory, and control logic for the data translation. The control logic of the apparatus employs mathematical formulae to produce encoded digital data which describes the characteristics of analog signals representing digital data without converting the digital data into analog signals. The apparatus further performs the function of transforming encoded digital data describing analog signals representing digital data into digital data.

Abstract: A method and at least one subscriber station utilizes a software package in combination with at least one terminal adapter which links ISDN circuit-switched channels, such as "B", "H0", "H10", "H11" and the like, into a single logical connection and synchronizes the linked channels in an ISDN system. The station allows a subscriber to dynamically select various bandwidths (i.e. different channels) for data transfer, such as text or graphics. The software package and, preferably, multiple terminal adapters, reside on a personal computer and also permits simultaneous messaging and voice functions between several such subscriber stations. Any number of logical channels can be managed. ISDN data is segmented based on the channel's respective data rates and thereafter simultaneously sent on the channels of the logical connection. ISDN data is consequently transferred at a rate greater than the rate available on any single ISDN channel.