FIELD: radio engineering. SUBSTANCE: invention can be used in subscriber's switchboard in system of commutation of mode of asynchronous transmission. System of commutation of mode asynchronous transmission has unit of commutation of elements of data having at least one port of switch for sending of asynchronous transmission of elements of data and subscriber's switchboard having collection of subscriber ports. Device processing elements of data used in system of commutation of mode of asynchronous transmission has conversion storage to store controlling information to determine necessity of copying of element of data from port of switch and controller to copy element of data from port of switch and to send copied elements of data to subscriber ports in agreement with controlling information stored in conversion storage. If element of data is element for transmission from one point to another one then system of commutation of mode of asynchronous transmission transforms heading included in element of data in correspondence with controlling information and sends element of data with transformed heading to one subscriber port as minimum. But if element of data is element for transmission from one point to collection of points then system of commutation of mode of asynchronous transmission selects subscriber ports on basis of transformed heading and sends element of data which heading is allotted to selected subscriber ports. EFFECT: provision for sending asynchronous transmission of elements of data copied from one signal source to subscriber ports without interruption of usage of copied elements of data, processing of elements of data when one element of data is sent to one subscriber port on condition that routing information based on transformation with usage of heading is not provided. 13 cl, 7 dwg, 2 tbl
