Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1994-12-19
1997-08-19
Brown, Thomas W.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379395, 379399, 379324, 379412, 379 26, H04M 1900, H04M 308
Patent
active
056596103
ABSTRACT:
Resistive circuits are provided at the tip and ring of the battery feed circuit as a method of alleviating the need for bulky DC transformers or complex integrated circuitry. The voltage is monitored through a set of comparators eliminating the expense of maintaining fused resistors. The voltages for voice or data transmission is amplified prior to being transmitted. Received signals are AC coupled, with proper biasing, onto the tip and ring lines. Any AC noise on the tip and ring line is shifted 180 degrees out of phase and re-inserted on the line to cancel the noise. As an enhancement to the battery feed circuit, another voltage comparator is added to check the line for DC current signifying an off hook condition.
REFERENCES:
patent: 3932713 (1976-01-01), Fleuchaus et al.
patent: 3993880 (1976-11-01), O'Neill
patent: 4007335 (1977-02-01), Hetherington et al.
patent: 4176255 (1979-11-01), Rudisill, Jr.
patent: 4419542 (1983-12-01), Embree et al.
patent: 4476350 (1984-10-01), Aull et al.
patent: 4554412 (1985-11-01), Smith
patent: 4558186 (1985-12-01), Stahl
patent: 4577064 (1986-03-01), Huft et al.
patent: 4602130 (1986-07-01), Chea, Jr.
patent: 4612417 (1986-09-01), Toumani
patent: 4677669 (1987-06-01), Kawami et al.
patent: 4736415 (1988-04-01), McNeill et al.
patent: 4737981 (1988-04-01), Hoberman et al.
patent: 4866768 (1989-09-01), Sinberg
patent: 4872199 (1989-10-01), Kawami et al.
patent: 4899382 (1990-02-01), Gartner
patent: 4982422 (1991-01-01), Itoh et al.
patent: 5113426 (1992-05-01), Kinoshita et al.
patent: 5335272 (1994-08-01), Lofmark et al.
patent: 5347577 (1994-09-01), Takato et al.
patent: 5444777 (1995-08-01), Condon et al.
patent: 5515433 (1996-05-01), Chen
patent: 5528688 (1996-06-01), Schorr
Schorr Ian Andrew
Spires Dewayne A.
Brown Thomas W.
Kumar T. Devendra
Lucent Technologies - Inc.
LandOfFree
Battery feed 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 Battery feed circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Battery feed circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1110811