Telephone system for ISDN and public telephone networks

Details Telephone system for ISDN and public telephone networks Telephone system for ISDN and public telephone networks

1989-08-22

1991-11-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701101, 370 60, H04J 302

Patent

active

050671251

ABSTRACT:
A telephone system which can be connected to both an ISDN and a public telephone network. When an analog telephone communicates with the ISDN, digital communication information from the ISDN is converted into the corresponding analog communication information by a A/D conversion circuit so as to transmit it to the analog telephone. Analog communication information from the analog telephone is converted into the corresponding digital communication information by an A/D conversion circuit so as to transmit it to the ISDN. Therefore, usual analog telephones can be connected to the ISDN. When the digital telephone communicates with a public telephone network, analog communication from the public telephone network is converted into the corresponding digital communication information by the A/D conversion circuit so as to transmit it to the digital telephone, while digital communication information from the digital telephone is converted into the corresponding analog communication information by the D/A conversion circuit so as to transmit it to the public telephone network. Therefore, digital telephones can be connected to a usual public telephone network.

REFERENCES:
patent: 4453247 (1984-06-01), Suzuki et al.
patent: 4644527 (1987-02-01), Anderson et al.
patent: 4771425 (1988-09-01), Baren et al.
patent: 4922484 (1990-05-01), Yoshida et al.

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