1982-09-10
1985-08-27
Brown, Thomas W.
179 2A, H04M 160, H04M 172, H04M 342, H04M 1100
Patent
active
045380317
ABSTRACT:
A service circuit for a local telephone line in a building wired with quad telephone conductors, including a tip and ring lead pair continuous with a subscriber's line connected to a remote switching machine, and a service lead pair within the building. A special service circuit is connected to the tip and ring lead pair and to the service lead pair. A control unit is also connected to the tip and ring lead pair and the service lead pair for receiving signals over either the tip and ring pair or the service lead pair from a telephone connected to the local line, and for generating a predetermined special service circuit enabling signal on the service lead pair. The enabling signal is received by the special service circuit which implements one or more special services in response thereto. The control unit also applies operating power to the service lead pair. The special services implemented include intercom, paging, tone ringing, etc. The control unit also provides power, control, rapid dialing signals, etc.
REFERENCES:
patent: 4079212 (1978-03-01), Sasai
patent: 4088846 (1978-05-01), McEowen
patent: 4097690 (1978-06-01), Kuntz et al.
patent: 4100375 (1978-07-01), Noller
patent: 4196317 (1980-04-01), Bartelink
Benning Gordon D.
Blackhall Robert K.
Neathway Graham A.
Pascas Brian J.
Wilker Paul S.
Brown Thomas W.
Trillium Telephone Systems Inc.
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