Automatic electronic disconnector for subscriber terminal equipm

Details Automatic electronic disconnector for subscriber terminal equipm Automatic electronic disconnector for subscriber terminal equipm

1982-08-23

1984-04-24

Pitts, Harold I.

179 2A, 179 2DP, 179 613, H04M 164, H04M 1100

Patent

active

044449992

ABSTRACT:
An electronic circuit means for automatically disconnecting an off-hook subscriber's first telephonic signal sending and receiving terminal device which is in an off-hook mode when a second terminal device is taken off-hook. The disconnector circuit means has voltage sensing means, current sensing means and line disconnecting means. The voltage sensing means senses a voltage across the current sensing means and when at a pre-determined level turns the current sensing means on allowing current to flow through the first terminal device. When the second terminal device is taken off-hook, the voltage across the loop circuit drops and current flow through the current sensing means drops. When the current drops to a pre-determined value, the current sensing means actuates the line disconnecting means and shuts off the current flow through the first terminal device.

REFERENCES:
patent: 3825699 (1974-07-01), Danner
patent: 3859463 (1975-01-01), Curtis
patent: 3899639 (1975-08-01), Cleveley et al.
patent: 3935390 (1976-01-01), Winterhalter
patent: 4311875 (1982-01-01), Danner

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