- What is the intellectual questions of the property (Intellectual Property – IP) concerning USB, whether is it the license, how many does it cost, what is (Reciprocal Covenet Agreement ) about which I heard as of “the Return Contract”?
Use of USB is free from royalties, i.e. founders of the specification allow anybody to develop on its basis the production without any kind of payment for it. Developers of the specification of the bus have signed IP agreement, in which it is promised that there will be no suit on any included point in IP within the specification. The return Contract is a copy of this agreement with the possibility for any who introduces USB bus, to sign this contract and to return it in administration USB-IF, for entering of record that the agreement is read and understood. The return Contract is accessible to everyone (to members of USB-IF or not) to the explanation of the license agreement on USB.
- What is OHCI and UHCI specifications?
OHCI and UHCI, are the specifications compatible with USB, and describe the interface of various hardware realizations of the built in controller. The variety of built in into the hardware part systems of the controllers, is natural development and is created within the limits of specification of the USB.
- Whether there is a group of news about USB?
There is a list of post mailing for members of USB-IF in which there are discussions and interactions between the companies. There is no censorship or check, except the rules of correspondence defining that the themes connected with USB are discussed only. It not the present group of news, as it works only through e-mail, accordingly any archive accessible each for viewing isn’t conducted.
- Whether there is a possibility to increase length of connection of devices through USB bus to 50-200 meters (for example, using an optical fiber) if it is required to users?
The peripheral interface of USB is intended for the desktop systems, and the distance in 200 meters, seemingly, corresponds to a very big table. Many companies entering into the community of introduction of USB, for a long time already discuss a problem of application of the bus on the big distances and think of creation of products which would allow to make it possible. The expansion device looks as two hubs for USB bus, however uses other reports (for example, for an optical fiber) between points of connection of a cable. On each end of the electric signal in USB should be broadcasted in or from a signal for long distances. For this purpose, that all it would become possible, it is necessary to solve the questions connected with the report of transfer of packages of the data and time delays, which should be compatible and correspond to specification of USB.
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