Two port signalling voltages filter arrangement

Details Two port signalling voltages filter arrangement Two port signalling voltages filter arrangement

1994-03-24

1997-04-22

Brown, Thomas W.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379398, 379400, H04B 316, H04M 900

Patent

active

056235437

ABSTRACT:
A twisted-pair telephone line is connected to a conventional telephone via a low-pass filter and equipment for receiving signals in an upper frequency range, e.g., 25-1000 kHz via a high-pass filter. The low-pass filter is primarily passive (to allow passage of line power, ringing and signalling voltages) but, to improve matching to non-resistive line and telephone impedances, at least the main part of the filter is flanked by impedance convertors in which amplifiers having an appropriate transfer function feed voltages back into the line via transformers through which power, ringing and dialing may pass unimpeded.

REFERENCES:
patent: 3828281 (1974-08-01), Chambers, Jr.
patent: 4185250 (1980-01-01), Regan
patent: 5249224 (1993-09-01), Chambers
patent: 5258713 (1993-11-01), Rosch et al.
CCITT Documents T1, E1.4/94 018 Jan. 12, 1994 Ken Hohhof. (pp. 2-5).
CCITT Documents T1, E1.4/94-018 dated Jan. 12, 1994.
"Study of the Feasibility and Advisability of Digital Subscriber Lines Operating at Rates Substantially in Excess of the Basis Access Rate" CCITT, T1E1.4, Aug. 18, 1992-152.

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