Transmission system having adjustable output signal levels utili

Details Transmission system having adjustable output signal levels utili Transmission system having adjustable output signal levels utili

1998-06-10

2000-09-26

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

710 14, 710 65, 345 95, 323283, G06F 1314, G06F 1320

Patent

active

061254150

ABSTRACT:
A user control system for allowing an end user to control the level of a signal transmitted from a host to a transmission medium is disclosed. The user control system includes a digital current controller electrically connected to a bias voltage generator, and formed of a binary weighted transistor array that is switched according to user inputs received from a host. Also disclosed is a transmission system incorporating the user control system and further including a current-mode digital-analog converter, an on-chip low-pass filter, a line driver, and output impedance control. Further, a method for optimizing the output signal through user control is disclosed. The control system and method can be used in transmission of Ethernet signals onto an unshielded twisted pair cable. In addition, with appropriate modification, the transmission system and method can be used for transmitting ATM or other signals onto a transmission medium.

REFERENCES:
patent: 5241281 (1993-08-01), Wilkes et al.
patent: 5717321 (1998-02-01), Kerth et al.
patent: 5798922 (1998-08-01), Wood et al.
patent: 5859625 (1999-01-01), Hartung et al.
patent: 5952992 (1999-09-01), Helms

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