Direct current feed with line status change adaptation in a comm

Details Direct current feed with line status change adaptation in a comm Direct current feed with line status change adaptation in a comm

1997-06-06

1999-07-20

Eisenzopf, Reinhard J.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, 379286, H04M 100

Patent

active

059265442

ABSTRACT:
A line card integrates subscriber line interface circuitry, A/D and D/A converters, and digital signal processing technology. The digital signal processing technology performs many line card tasks such as switch hook detection, ground key detection, DC feed control, polarity reversal, ringing tests, fault detection, power cross detection, and ring trip detection. The digitally processed DC feed control ensures that digitally filtered A (Tip) and B (Ring) conductor voltages closely follow actual subscriber loop Vab voltages to avoid circuitry saturation and to validate power feed operating point calculations relative to actual subscriber loop conditions. Furthermore, the DC feed control opens a Vab fluctuation window in high current gain areas of subscriber loop power feed to reduce noise.

REFERENCES:
patent: 3611165 (1971-10-01), Hills
patent: 4106102 (1978-08-01), Desblache
patent: 5226059 (1993-07-01), Fasterling
patent: 5253291 (1993-10-01), Naseer et al.
patent: 5323460 (1994-06-01), Warner et al.
patent: 5583934 (1996-12-01), Zhou
patent: 5636273 (1997-06-01), Schopfer et al.
patent: 5744944 (1998-04-01), Danstrom
patent: 5777911 (1998-07-01), Sherry et al.

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