Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1985-07-05
1988-04-05
Ng, Jin F.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379405, H04M 1900
Patent
active
047364157
ABSTRACT:
This is an improved resistive line battery feed circuit where the improvement consists in establishing a balanced stable power point using an opamp and capacitive input and feeding the AC output to both lines of the tip and ring circuit via opamps and a hybrid for injecting current. In this manner longitudinal balance is maintained. Current is added to the line circuit by a modulated DC current source.
REFERENCES:
patent: 4203009 (1980-05-01), Tattersall
patent: 4433215 (1984-02-01), Wortman
patent: 4554412 (1985-11-01), Smith
"Two-Way/Four-Way Circuit", D. Esteban et al., IBM Technical Disclosure Bulletin, vol. 16, No. 5, Oct. 1973, pp. 1556-1557.
McNeill Bruce W.
Smith Douglas C.
American Telephone and Telegraph Company
AT&T Information System Inc.
Bell Telephone Laboratories Incorporated
Ng Jin F.
Padnes David R.
LandOfFree
Resistive line 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 Resistive line feed circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resistive line feed circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2239081