Signal coupler with automatic common line attenuation compensati

Details Signal coupler with automatic common line attenuation compensati Signal coupler with automatic common line attenuation compensati

1995-04-05

1997-05-06

Lee, Benny

Wave transmission lines and networks

Automatically controlled systems

333263, 333126, 379390, H04M 1106, H03H 746

Patent

active

056275013

ABSTRACT:
The present invention relates to a for coupling Plain Old Telephone Service (POTS) signals and Asymmetric Digital Subscriber Line (ADSL) signals to a common line (TL). In order to avoid saturation of inductances (L1,L2,L3,L4) of a low pass POTS filter (LPF) located between the POTS transmitter/receiver (PTR) and this common line (TL) when the POTS signal is not sufficiently attenuated by this common line (TL), a variable impedance (SL) is inserted between the POTS transmitter/receiver (PTR) and this low pass POTS filter (LPF). The value of this variable impedance (SL) is controlled by a control signal (CS) supplied by the ADSL transmitter/receiver (ATR) which measures the attenuation caused by this common line (TL).

REFERENCES:
patent: 4443662 (1984-04-01), Nakhla
patent: 4679227 (1987-07-01), Hughes-Hartogs
patent: 4742540 (1988-05-01), Schingh
patent: 5133007 (1992-07-01), Nishimura
patent: 5271060 (1993-12-01), Moran, III et al.
patent: 5459440 (1995-10-01), Claridge et al.
"Multi-Tone Transmission for Asymmetric Digital Subscriber Lines (ADSL)", K. Sistanizadeh et al, IEEE Int'l Conference on Communications '93, vol. 2, May 1993, Geneva, pp. 756-760.
"Telephony Transmission and Splitters, Passive and Active", J. Cook, ANSI/TlEl.5/94-043, Feb. 1994, pp. 1-14.

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