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Title:
COMMUNICATION TRANSMISSION SYSTEM
Document Type and Number:
Japanese Patent JPS553299
Kind Code:
A
Abstract:
The present invention relates to a communications transmission system wherein there is superposed, on the conventional analog telecommunication network, a digital network whose digital local exchanges are connected with digital subscriber stations. Both networks are interconnected between the analog and digital local exchanges by way of analog/digital converters and digital/analog converters. In each digital subscriber station, a data transmission is possible simultaneously with voice transmission due to an automatic sub-channel formation by means of a multiplexer and a demultiplexer. An arrangement is provided for data clock pulse recognition to determine at which bit rate the respective data terminal operates, and causes a suitable sub-channel for the data to be arranged with a bit rate which is obtained from the voice channel.

Inventors:
HERUBERUTO SHIYUTOREERU
Application Number:
JP7694679A
Publication Date:
January 11, 1980
Filing Date:
June 20, 1979
Export Citation:
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Assignee:
SIEMENS AG
International Classes:
H04B3/00; H04J3/00; H04M3/00; H04M11/06; H04Q11/04; (IPC1-7): H04B1/00; H04B12/00
Domestic Patent References:
JP45032483A
JPS52130206A1977-11-01
JPS4942202A1974-04-20