Interface apparatus for communication terminal equipment units

Details Interface apparatus for communication terminal equipment units Interface apparatus for communication terminal equipment units

1988-05-23

1990-08-28

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 97, 379100, 379102, H04M 1100

Patent

active

049531999

ABSTRACT:
An interface apparatus connects one of a plurality of communication terminal equipment units to a single telephone line on the basis of a selection signal supplied via the telephone line. The telephone line is disconnected when there is no answer from the selected communication terminal equipment unit within a predetermined time period.

REFERENCES:
patent: 4345113 (1982-08-01), Shelley
patent: 4639553 (1987-01-01), Kiglichi
patent: 4660218 (1987-04-01), Hoshimoto
patent: 4677660 (1987-06-01), Yoshida
patent: 4805210 (1989-02-01), Griffith, Jr.
patent: 4821312 (1989-04-01), Horton et al.
Finlay, Alex, "A New and Different Automatic Meter Reading", 2nd Int'l Conf. on Metering Apparatus 9/26-29/72.

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