Small key telephone system

Details Small key telephone system Small key telephone system

1984-09-21

1986-05-13

Dwyer, James L.

179 84SS, 179 99P, H04M 172

Patent

active

045888647

ABSTRACT:
An intercommunication system makes use of existing quad wiring to provide intercom communication between the subsets of the system, as well as communication with a standard central office, or an "outside line". Each subset is provided with a control sequencer for selectively connecting the set to either an "intercom" or an "outside" or C.O. line. When the handset of a subset is lifted off the respective hookswitch, the subset is automatically connected to intercom line and signalling between subsets can occur with the outside line on "hold". The hold is released automatically when another handset is picked up.
Two indicators show activity on the two lines respectively.

REFERENCES:
patent: 4079212 (1978-03-01), Sasai
patent: 4088846 (1978-05-01), McEowen
patent: 4100375 (1978-07-01), Noller
patent: 4132860 (1979-01-01), Rasmussen
patent: 4196317 (1980-04-01), Bartelink

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