COMMUNICATION METHOD AND APPARATUS WITH TRANSMISSION OF A SECOND SIGNAL DURING ABSENCE OF A FIRST ONE

摘要

A network station (4) receives a principal signal (S) and data (D). When the principal signal (S) is present or contains information, it is transmitted t o a receiving station (6) through a communication channel. When the principal signal (S) is absent or does not have a significant information content, the network station (4) transmits the data (D) through the same communication channel in a format such that the data (D) is received and output by a furth er receiving station (8).