Microcomputer controlled key telephone line circuit

Details Microcomputer controlled key telephone line circuit Microcomputer controlled key telephone line circuit

1981-07-27

1983-05-03

Brigance, Gerald L.

179 99LS, 179 18FA, H04Q 518

Patent

active

043821634

ABSTRACT:
A microcomputer controlled key telephone line circuit for use in a key telephone. A microcomputer is used to sequentially and alternately scan the ringing leads and tip and ring leads associated with connected line circuits and A leads associated with connected telephone stations. The microcomputer operates in response to changes in the status of these leads to control the normal key telephone functions such as line pickup, hold and ringing current detection, lamp illumination and tone signaling.

REFERENCES:
patent: Re29078 (1976-12-01), Tate
patent: 4046972 (1977-09-01), Huizinga et al.
patent: 4092501 (1978-05-01), Suzuki et al.
patent: 4160131 (1979-07-01), Kaul et al.
patent: 4322581 (1982-03-01), Christain et al.
patent: 4327256 (1982-04-01), Crooks et al.

Affiliated with

Also associated with

Rating

Microcomputer controlled key telephone line circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microcomputer controlled key telephone line circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microcomputer controlled key telephone line circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1209668