Telephonic communications – Centralized switching system – With generating of call associated substation signal
Reexamination Certificate
2006-02-21
2006-02-21
Swerdlow, Daniel (Department: 2646)
Telephonic communications
Centralized switching system
With generating of call associated substation signal
C379S373010, C379S093060
Reexamination Certificate
active
07003089
ABSTRACT:
In a telephone system where frequency multiplexed analog telephone signals and digital data signals are transmitted over a line, incoming calls are announced to the customer installation by a ringing indication signal having an amplitude between 1 and 30 V RMS, which is much less than the regular ringing and therefore easier to be generated, and moreover having a smoother shape than a rectangular shape. Upon receiving the ringing indication signal, the customer installation locally generates and provides a full ringing signal to a telephone. The amplitude of this local ringing signal is higher than the amplitude of the ringing indication signal, but the line with the digital data signal is isolated from the customer telephone equipment at the time the ringing signal is generated, so as to avoid disturbance of the digital data transmission by the ringing current, which is a source of impulsive noise.
REFERENCES:
patent: 3591728 (1971-07-01), Birck
patent: 4042786 (1977-08-01), Freimanis
patent: 4189626 (1980-02-01), Malerba et al.
patent: 4197433 (1980-04-01), Bronner
patent: 5757803 (1998-05-01), Russell et al.
patent: 6144733 (2000-11-01), Amrany et al.
patent: 6324268 (2001-11-01), Balachandran et al.
patent: 6400803 (2002-06-01), Tate et al.
patent: 6477249 (2002-11-01), Williamson et al.
patent: 0 740 451 (1996-10-01), None
Alcatel
Swerdlow Daniel
LandOfFree
Splitter for analog telephone signal and digital data does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Splitter for analog telephone signal and digital data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Splitter for analog telephone signal and digital data will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3694058