An FSK modem for coupling a standard data port (50) to a telephone line (45) in which the signal path between the phone line and the data port passes through a processor (55). When the modem is in a transparent mode of operation, for transmitting data, a timer (190) detects the passage of a predetermined...http://www.google.fr/patents/US4549302?utm_source=gb-gplus-shareBrevet US4549302 - Modem with improved escape sequence mechanism to prevent escape in response to random occurrence of escape character in transmitted data
Modem with improved escape sequence mechanism to prevent escape in response ...
