USB Extension System Using FPGA Spoofing for Long Distance Transmission
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Solution Overview
Problem
The existing USB standard is limited to a maximum distance of thirty meters, which is insufficient for certain applications requiring USB functionality at distances of up to seven hundred and fifty meters or more, such as in KVM systems where peripheral devices need to be connected to a host computer located far away.
Innovation Solution
The development of a USB extension system that uses a series of FPGAs and transceivers to manage data transmission over longer distances by employing a spoofing algorithm to handle the increased round-trip time delays, allowing data to be transmitted effectively over extended lengths through a single cable or fiber optic link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the USB standard is used for data transmission, then data can be transmitted reliably, but the transmission distance is limited to thirty meters
Solution Approach 1:
The transmission system is divided into multiple segments: USB host connector with upstream FPGA, communication channel, downstream FPGA with USB device connector. Each segment handles specific functions (USB protocol processing, long-distance transmission, protocol conversion) to achieve reliable long-distance communication
Solution Approach 2:
FPGAs act as intermediary devices between the USB host and remote USB devices. They implement spoofing algorithms to mask the extended distance, making the system appear as a standard USB connection while actually transmitting data over hundreds of meters
2Length of stationary object
If multiple hubs and cable segments are used to extend distance, then transmission distance increases, but device complexity increases
Solution Approach 1:
The patent combines USB protocol processing, long-distance communication, and spoofing algorithm implementation into integrated FPGA devices. This merging eliminates the need for multiple separate hubs and cable segments, reducing system complexity while achieving the same distance extension
Solution Approach 2:
The FPGA devices serve multiple functions: they act as USB protocol processors, long-distance transceivers, and spoofing algorithm implementers. This multi-functionality replaces what would otherwise require multiple specialized components, simplifying the overall system
Data Source
AI summary
A universal serial bus (USB) extension allows for the transmission of data at high speeds over a much greater distance than typical USB operating range. USB devices may be connected to host computers at distances of 750 meters or more. USB tokens from a host computer are spoofed.