Abstract: A data communication device (500) which is capable of providing inverse multiplexing, avoids having to perform address offset calculations by storing the incoming data from each of its incoming data channels in corresponding data buffers having predefined data structures which eliminate the need for offset calculations during data transfers and protocol processing. The communication device (500) compares the actual address location that a particular byte, such as a frame count byte, is presently stored in the data buffer and the address location it should be stored in order to avoid using offset calculations. If the actual location the frame count (FC) byte is located in is not the desired location the frame count byte should be located, the communication device (500) programs its SCCs (508, 510) to commence storing subsequent data bytes in the appropriate address locations in each of the data buffers found in memory (538) so as to avoid having to perform offset calculations during memory accesses.