Method for processing telephone signals supplied by an analog telephone terminal and data supplied by a data terminal

A subscriber line circuit for handling telephone signals supplied by an analog telephone set and data supplied by a data terminal in a subscriber line circuit of a digital telephone switching system used at least in subregions for data transmission, comprising:

• a telephone set for producing telephone signals;
• a data terminal having a modem for producing data signals;
• an analog subscriber line, said telephone set (Tela, Telb) and said data terminal directly connected to a subscriber line circuit of a digital telephone switching system through said analog subscriber line;
• an analog/digital converter having a sampling rate above a sampling rate required for telephone information, said analog/digital converter:
• connected to said telephone set and said data terminal;
• receiving said telephone signals and said data signals;
• and
• producing digital signals according to the sampling rate such that the data originating from the data terminal is not subject to the same restrictions as the signals originating from the analog telephone set;
• and
• a digital signal processor reducing signals incoming from the digital telephone switching system to a transmission bit rate for telephone transmission and simultaneously coding said telephone signals according to a nonlinear characteristic.

In a digital telephone switching system used at least in subregions for data transmission, a subscriber line circuit, comprising:

• a telephone set for producing telephone signals;
• a data terminal having a modem for producing data signals;
• an analog subscriber line, said telephone set and said data terminal directly connected to the digital telephone switching system through said analog subscriber line;
• an analog/digital converter having a sampling rate above a sampling rate required for telephone information, said analog/digital converter:
• connected to said telephone set and said data terminal;
• receiving said telephone signals and said data signals;
• and
• producing digital signals;
• and
• a digital signal processor reducing signals incoming from the digital telephone switching system to a transmission bit rate for telephone transmission and simultaneously coding said telephone signals according to a nonlinear characteristic such that the data originating from the data terminal is not subject to the same restrictions as the signals originating from the analog telephone set.