FIELD: communication. SUBSTANCE: data transmission unit 211, 213 for peripheral devices of cordless phone which uses multiplex-transmission compander information bus for communication with information transmission control unit of cordless phone 201. Peripheral devices which are peripheral with respect to cordless phone 201 as well as other devices for user information input, such as handset 203 of mobile cellular phone are connected to central processing unit of cordless phone and voice signal processor 207. Data transmission unit outputs time intervals which are grouped in blocks which information is transmitted through information bus. Total message which contains information bits and header is transmitted in time interval from peripheral device to bus information transmission control unit in order to detect bus access collisions. Collision is resolved during start of information bus by means of setting priority with respect to other data transmission blocks. According to this priority data transmission unit of peripheral device is allowed to access bus. EFFECT: increased functional capabilities. 9 cl, 21 dwg
