Method for simultaneous transmission of a telephone link and a data link, in particular a videotex link, on conventional two-wire copper lines between digitally controlled exchanges and digital subscriber devices

摘要

For simultaneous transmission of a telephone link and of data information on conventional two-wire copper lines between a digitally controlled exchange and a digital connection device at the subscriber end, the transmission channel used is divided on the connection lines into a speech channel and a data channel, which are then separately switched. At the subscriber end and also in the digital exchange, digital connection devices or subscriber circuits are used to divide or combine information into one transmission channel.