Service integrated digital transmission system

Details Service integrated digital transmission system Service integrated digital transmission system

H - Electricity

04

Q

325/1, 363/1.8

H04Q 11/00 (2006.01) H04B 10/12 (2006.01) H04M 11/06 (2006.01) H04N 7/22 (2006.01)

Patent

CA 1160768

ABSTRACT OF THE DISCLOSURE A service integrated transmission system for transmitting, over a light transmission path, digital signals having a transmission band whose upper limit frequency corresponds to the maximum bit rate of the signals to be trans- mitted, the transmission being effected by simultaneously transmitting, over the transmission path, digital signals having a high bit rate only in an upper part of the transmission band and digital signals having a low bit rate only in a lower part of the transmission band. The system includes a transmitter at one end of the path which separately multiplexes low bit rate signals into a narrowband signal and high bit rate signals into a broadband signal, combines those multiplexed signals, and modulates a light source with the combined signal. A receiver at the other end of the path converts the modulated light signal into a demodulated electrical signal, separates the two multiplexed signals, and then demultiplexes each of the latter signals.

390974

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