Private branch exchange capable of discriminating different type

Details Private branch exchange capable of discriminating different type Private branch exchange capable of discriminating different type

1989-04-25

1990-08-28

Ng, Jin F.

Telephonic communications

Multi-line or key substation system with selective switching...

379166, 379324, 379377, 379413, H04M 100, H04Q 500

Patent

active

049532006

ABSTRACT:
A private branch exchange for use with different types of telephone sets comprises a current detection device such as a photo-coupler for detecting a current flowing through a data line connecting to a multifunction telephone set to discriminate among different types of telephone sets and a current limiting circuit for limiting a current supplied from a power source device through a voice line in accordance with an detected output from said current detection device.

REFERENCES:
patent: 4088844 (1978-05-01), Kinnard, Jr.
patent: 4088846 (1978-05-01), McEowen
patent: 4220827 (1980-09-01), Burke et al.
patent: 4254306 (1981-03-01), Sekiguchi et al.
patent: 4327256 (1982-04-01), Crooks et al.
patent: 4572928 (1986-02-01), Nishimura et al.
patent: 4759059 (1988-07-01), Christensen

Affiliated with

Also associated with

Rating

Private branch exchange capable of discriminating different type does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Private branch exchange capable of discriminating different type, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Private branch exchange capable of discriminating different type will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1595410