Abstract: A method is provided of determining access in a communication network having a main station (CS) and user stations (US1-USM) with distinct N-bit binary addresses, and having an access protocol including transmitting from the main station (CS) an invitation-to-send signal, and upon receipt thereof by the user stations (US1-USM), starting an access group which includes all user stations (US1-USM) wanting access to the main station (CS).

Abstract: The error detection and correction device detects and corrects single bit errors in a sequence of bits comprising a plurality of n-bit containing subsets applied on a parallel bus IN having m subset parts. It includes a storage module ST connected to the bus IN and which transfers the subsets as they are received on the bus to a divider logic circuit DL. This circuit performs a m*n bit parallel modulo 2 division of the received sequence by a given polynomial and transfers the remainder REM to a comparison circuit C where it is compared with a zero byte or with an error code byte HEC contained in the sequence depending on the position of the first byte of the sequence on the bus. Based on the result of the comparison and using translation tables a processor circuit PR determines the bit position in the sequence of a bit error. A correction logic CL corrects the received sequence.