Telephonic communications – Subscriber line or transmission line interface
Patent
1994-11-09
1996-12-17
Hofsass, Jeffery
Telephonic communications
Subscriber line or transmission line interface
379405, 379402, 379413, 379344, H04M 1900
Patent
active
055861814
ABSTRACT:
A channel unit network having a two-wire port for interconnecting a two-wire, bidirectional signal transmitting means with a four-wire digital transmitting means in a communication system to create a precision bidirectional simulated two-wire cable pair with an extended operation range over a transmission medium includes a signal processing circuit, tip and ring switch mode driver, a negative inductor circuit, a negative capacitor circuit, and a 200 Hz impedance circuit. The negative conductor circuit and the negative capacitor circuit are used to generate respective negative inductance and negative capacitance at 24 Hz in order to maintain loop stability. The 200 Hz impedance circuit is used to generate a positive impedance at a frequency of approximately 200 Hz so as to prevent overloading of external telephone communication testing circuitry.
REFERENCES:
patent: 4287393 (1981-09-01), Reuvekamp
patent: 4476350 (1984-10-01), Aull et al.
patent: 4677669 (1987-06-01), Kawami et al.
patent: 4764956 (1988-08-01), Rosch et al.
patent: 4852160 (1989-07-01), Kiko
patent: 4914693 (1990-04-01), Beck et al.
patent: 5202919 (1993-04-01), Kiko
patent: 5457743 (1995-10-01), Kiko
Chin Davis
Hofsass Jeffery
Saint-Surin Jacques M.
Tollgrade Communications, Inc.
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