Patent ID: 7280592

Claim:
A communication system for communicating digital information, the communication system comprising a digital adapter ( 5 ) and an analog adapter ( 6 ), wherein the digital adapter ( 5 ) is linked to a digital exchange ( 3 ) by means of a digital interface ( 7 ) and the analog adapter ( 6 ) is linked to an analog exchange ( 4 ) by means of an analog interface ( 8 ), said exchanges ( 3 , 4 ) being linked by means of a telecommunications network ( 2 ), wherein said digital adapter and analog adapter include link means ( 11 , 12 ; 15 , 16 ) for linking between the digital adapter ( 5 ) and the analog adapter ( 6 ), the digital information from the digital adapter ( 5 ) being sent to the analog adapter ( 6 ), and vice versa, in a digital form without emulating an analog signal, wherein said link means ( 11 , 12 ; 15 , 16 ) include, in the direction of transmission going from the analog adapter ( 6 ) to the digital adapter ( 5 ), an analog transmitter ( 16 ) situated in the analog adapter ( 6 ) and able to transmit, to a digital receiver ( 12 ) situated in the digital adapter ( 5 ), an analog signal such that, when the analog signal is sampled by the analog interface of the exchange ( 4 ), the sample of the analog signal will equate to the sum of a value able to be determined by the digital information transmitted by the analog adapter ( 6 ) to the digital adapter ( 5 ) and of the echo of the signal transmitted by the digital adapter ( 5 ), without said value having to be equal to a level of a quantization law.