USB 3.0 Extension Devices for Long-Distance SuperSpeed Communication
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Solution Overview
Problem
The existing USB specifications limit SuperSpeed USB connections to a maximum cable length of 3 meters due to timing and signaling requirements, restricting the distance between a host and a USB device.
Innovation Solution
The implementation of an upstream USB extension device and a downstream USB extension device, connected via a non-USB communication channel, allowing for the extension of USB 3.0 connections by bridging packets across a non-USB compliant communication channel and managing latency through different operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a regular copper cable is used for a SuperSpeed USB connection, then the connection complies with USB specifications, but the maximum cable length is limited to 3 meters
Solution Approach 1:
The USB connection is segmented into multiple components: an upstream USB extension device connected to the host via a first cable, a downstream USB extension device connected to the USB device via a second cable, and a non-USB communication channel connecting the two extension devices. This segmentation allows each segment to be optimized independently, enabling extended total cable length while maintaining timing and signaling compliance in each segment.
Solution Approach 2:
The non-USB communication channel acts as an intermediary between the upstream and downstream USB extension devices. This intermediary channel transfers USB packets between the extension devices without being constrained by USB cable length limitations, thereby enabling extended connection distances while maintaining USB protocol compliance in the USB-specific segments.
2Length of stationary object
If the cable length is extended beyond 3 meters, then the distance limitation is overcome, but timing mandates and signaling techniques cannot be properly supported
Solution Approach 1:
The non-USB communication channel serves as a mediator that handles the transmission of USB packets between extension devices over extended distances. By offloading the packet transmission to this intermediary channel, the system overcomes the timing and signaling constraints that would otherwise limit USB cable length to 3 meters.
Solution Approach 2:
The patent replaces the physical USB cable transmission mechanism with a non-USB communication channel for the extension segment. This substitution allows the system to bypass the timing and signaling constraints inherent in USB cable specifications while maintaining USB protocol compliance at the endpoints.
3Length of stationary object
If packets are transmitted across a non-USB communication channel, then cable length limitation is overcome, but latency management becomes necessary
Solution Approach 1:
The USB extension devices dynamically adjust their operational parameters based on the characteristics of the non-USB communication channel. This includes adjusting packet timing, buffering strategies, and flow control mechanisms to optimize performance and manage latency introduced by the extended communication path.
Solution Approach 2:
The system implements feedback mechanisms where the USB extension devices monitor transmission timing and latency characteristics of the non-USB communication channel, and adjust their packet transmission and buffering behavior accordingly to maintain optimal performance and manage latency.
Data Source
AI summary
Devices and methods for extending USB-compliant communication distances, including USB 3.0 SuperSpeed communication, are provided. In some embodiments, a host is communicatively coupled to a device that provides an upstream facing port, and a USB device is communicatively coupled to a device that provides a downstream facing port. The upstream facing port and downstream facing port are coupled via a communication channel. In some embodiments, the upstream facing port and downstream facing port generate packets to ensure that timing requirements of the USB specification are met regardless of the latency of the communication channel.