Method and apparatus for extending communications over USB
US7028133B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Apr 28, 2000 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Apr 28, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S370/906
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus are described for improving information transfer over USB. In one approach, hub-based extension is realized wherein power is distributed using auxiliary wiring distinct from signal and power wiring present in conventional USB cabling. Additional signals allow optimization of power distribution for powering attached devices, and for detecting and handling illegal connection configurations.In another approach, improvements are realized through use of alternative signaling techniques which eschew reflective and high-speed common-mode signaling. Described are various configuration, media and signal-protocol combinations, including implementations containing embedded hubs. Methods ensuring reliable system behavior are also described, including determination of extension path delay and use of topology-enforcement hubs.In other approaches, further improvements are realized by allowing information exchanges to take longer than the nominal timeout period, or by allowing host requests to be delayed for transmission until the extended bus is available for use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.