Patent ID: 6359931
Filing Date: 2002-03-19
Classification: H04L

Abstract:
A signaling apparatus comprising:a first current source coupled to a first switch, the first switch having a first terminal and a second terminal, wherein in response to a first control signal the first current source is coupled to either the first terminal or second terminal of the first switch; a second current source coupled to a second switch, the second switch having a first terminal and a second terminal, wherein in response to a second control signal the second current source is coupled to either the first terminal or second terminal of the second switch; a third current source coupled to a third switch, the third switch having a first terminal and a second terminal, wherein in response to a third control signal the third current source is coupled to either the first terminal or second terminal of the third switch; a fourth current source coupled to a fourth switch, the fourth switch having a first terminal and a second terminal, wherein in response to a fourth control signal the fourth current source is coupled to either the first terminal or second terminal of the fourth switch, and a plurality of conductors including: a first conductor having a first end connected to the first terminal of the first switch and the second terminal of the second switch; a second conductor having a first end connected to the first terminal of the second switch and the second terminal of the third switch; a third conductor having a first end connected to the first terminal of the third switch and the second terminal of the fourth switch; and a fourth conductor having a first end connected to the first terminal of the fourth switch and the second terminal of the first switch.