FIELD: communications engineering; synchronous digital hierarchy network systems using transport modules. SUBSTANCE: data channels are transferred inside synchronous digital hierarchy network with aid of transport modules. System is provided with memory modules having memory areas wherein incoming channel data packed in transport blocks of definite hierarchy layer are recorded in multiplexing mode with aid of control module and are re-read in the course of adapting to outgoing channel frequency. EFFECT: enhanced adaptation and switching quality in system operation. 11 cl, 6 dwg
