USB extender
First Claim
Patent Images
1. A USB extender connectable to a USB host and to a USB device for extending the distance between the USB host and the USB device, the USB extender having the capacity to extend a D+ signal and a D−
- signal between a USB host and at least one USB device more than 30 meters wherein the data transfer rate of the D+ and D−
signals between the USB host and USB device is at least approximately 480 Mb/sec and wherein the D+ signal and D−
signal are skewed by less than 100 ps.
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Abstract
The present invention relates to a system and method for extending the distance between USB hosts and USB devices. Provided are USB 2.x compatible extenders capable of separating a USB device from a USB host by more than 30 meters while maintaining an at least approximately 480 Mb/sec data rate.
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Citations
27 Claims
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1. A USB extender connectable to a USB host and to a USB device for extending the distance between the USB host and the USB device, the USB extender having the capacity to extend a D+ signal and a D−
- signal between a USB host and at least one USB device more than 30 meters wherein the data transfer rate of the D+ and D−
signals between the USB host and USB device is at least approximately 480 Mb/sec and wherein the D+ signal and D−
signal are skewed by less than 100 ps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- signal between a USB host and at least one USB device more than 30 meters wherein the data transfer rate of the D+ and D−
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24. A method for extending the distance between a USB host and at least one USB device, the method comprising:
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receiving at a device unit a D+ signal and a D−
signal from at least one USB device via a USB communications channel, the D+ and D−
signals being at least approximately 480 Mb/sec signals;
converting the D+ and D−
signals to a single-ended at least approximately 960 Mb/sec signal;
transmitting the at least approximately 960 Mb/sec single-ended signal over a non-USB communications channel;
receiving at a host unit the at least approximately 960 Mb/sec single-ended signal via the non-USB communications channel;
converting the at least approximately 960 Mb/sec single-ended signal to at least approximately 480 Mb/sec D+ and D−
signals; and
sending the at least approximately 480 Mb/sec D+ and D−
signals to a USB host via a USB communications channel;
whereby the USB host and the at least one USB device are separated by more than 30 meters. - View Dependent Claims (25)
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26. A method for extending the distance between a USB host and at least one USB device, the method comprising:
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receiving at a device unit a D+ signal and a D−
signal from at least one USB device via a USB communications channel, the D+ and D−
signals being at least approximately 480 Mb/sec signals;
transmitting the at least approximately 480 Mb/sec D+ and D−
signals over a non-USB communications channel;
receiving at a host unit the at least approximately 480 Mb/sec D+ and D−
signals via the non-USB communications channel;
reducing skew between D+ and D−
signals resulting from transmission over the non-USB communications channel; and
sending the at least approximately 480 Mb/sec D+ and D−
signals to a USB host via a USB communications channel;
whereby the USB host and the at least one USB device are separated by more than 30 meters. - View Dependent Claims (27)
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Specification