Out-of-band signaling method and apparatus to adapt payphones to

Details Out-of-band signaling method and apparatus to adapt payphones to Out-of-band signaling method and apparatus to adapt payphones to

1975-06-13

1977-03-01

Claffy, Kathleen H.

179 84VF, 179 63R, H04M 100, H04M 1702

Patent

active

040103285

ABSTRACT:
An out-of-band signaling method and apparatus are provided to facilitate the adaptation of payphones to telephone systems, as for example subscriber carrier systems. Part of the speech band is made unavailable to the subscribers and is employed for signaling DC line conditions from one end of the telephone system to the other.

REFERENCES:
patent: 2971062 (1961-02-01), Salihi
patent: 3061783 (1962-10-01), Noller
patent: 3306984 (1967-02-01), Leonard
patent: 3349191 (1967-10-01), Mann
patent: 3428757 (1969-02-01), Roscoe
patent: 3519758 (1970-07-01), Gfeller
patent: 3886321 (1975-05-01), Krasin

Affiliated with

Also associated with

Rating

Out-of-band signaling method and apparatus to adapt payphones to does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Out-of-band signaling method and apparatus to adapt payphones to, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Out-of-band signaling method and apparatus to adapt payphones to will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1353668