Method and apparatus for a hub capable of being self-powered for use in a USB-compliant system
US7346728B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 2005 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | May 10, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- 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.