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Integriertes Nachrichtensystem

DE 2538638 C UPAB: 19930901 The communications network using fibre-optic transmission lines uses one glass-fibre conductor for each of the send and receive paths. A subscriber video camera and analog-digital converter output is transmitted using 4-bit DPCM at 48 Mbit/s for black and white, 64 Mbit/s is used for the speech channel. The video and speech signals are switched to the light-emitting diode or laser transmitter. At the exchange the video and speech signals are separated and pass thro...