a digital concatenator , the operation of which is triggered by the sequential arrival of a series of n - bit bytes thereto , accepts such sequential n - bit bytes and , by directing those n - bit bytes into sequentially identified n - bit channels , concatenates those n - bit bytes into - sized words , where m is a pre - selected integral number of said n - bit bytes that are desired to be concatenated with an - sized output buffer into a resultant sequence of - sized words . the sequential identification of those n - bit bytes is brought about by a cyclical counter incorporated within a data enumerator that counts off the arrival of each n - bit byte and appends a corresponding position bit or byte to each one thereof . each successive reading of the output of the concatenator is triggered by the arrival at that output buffer through an m th channel of an m th n - bit byte . the concatenator similarly operates on single bits so as to serve as a serial to parallel converter of arbitrarily selectable size .