Telephone apparatus system

Details Telephone apparatus system Telephone apparatus system

1989-08-22

1991-07-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701101, 379 93, 379 94, H04M 1100

Patent

active

050349481

ABSTRACT:
A telephone system connected to an ISDN and a public service telephone network (PSTN) includes ISDN and PSTN interfaces and allows connected telephone sets to communicate with the both the ISDN and PSTN through a telephone apparatus main body. When the telephone apparatus main body becomes inoperative due to a power failure or the like, the ISDN or the PSTN is directly connected to one of the telephone sets. The connected telephone set receives operating power from the directly connected ISDN or PSTN, and can serve as a telephone set exclusively for the connected ISDN or PSTN.

REFERENCES:
patent: 4746986 (1988-05-01), Tanigawa
patent: 4794595 (1988-12-01), Ohyama
patent: 4893331 (1990-01-01), Horiuchi et al.

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