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632 results about "Physical media" patented technology

Physical media refers to the physical materials that are used to store or transmit information in data communications. These physical media are generally physical objects made of materials such as copper or glass. They can be touched and felt, and have physical properties such as weight and color. For a number of years, copper and glass were the only media used in computer networking.

Method and apparatus for medium access control in powerline communication network systems

An inventive Medium Access Control (MAC) protocol for powerline networking systems is described. The inventive MAC protocol controls access to and use of a physical medium (power lines) in a powerline networking system. The MAC protocol method and apparatus includes a method of providing “blanking intervals” in which devices using newer versions of the protocol “clear out” earlier version devices. The use of blanking intervals greatly eases backward compatibility of the network when the protocol is upgraded with new versions. The method of using blanking intervals is closely coupled to a technique of using “beacons.” The beacons are used to propagate blanking interval information throughout the network. The beacons also include a mechanism for informing devices of the expiration of blanking information. The MAC also includes a method of establishing and maintaining “virtual circuit” connections between selected devices on the network. The virtual circuits can be established in powerline networking systems not having a central controller. A method of assigning unique Logical Network Identifiers (LNIs) to logical networks in the powerline networking system is also described. The LNIs uniquely identify each of the logical networks in the network. A means for creating, managing and distributing network encryption keys is also described. The encryption keys are used by the devices in the powerline networking system to prevent data from being shared with unauthorized users.
Owner:CONEXANT SYST INC

System and method for distributing music and data

A system and method for distributing music and data. The music or data is first transmitted to a consumer via a satellite radio network. The system includes a satellite radio receiver for the user which is capable of receiving the wireless transmission and providing an audio and / or visual output in response thereto. In addition, the receiver is adapted to receive an input (e.g., voice command) from the user by which the user is able to signal an interest in recording a selection of music or data being played and / or displayed. In response to this signal and a record-ability signal, an ID signal is stored on a removable media which identifies the selection being played and / or displayed. The ID signal may be a composite signal indicating the time and channel, a signal that identifies a selection by number, or other suitable ID signal. Finally, the system includes a computer for allowing the user to use the removable media to retrieve the desired selection via the a second network such as private distribution hub or the World Wide Web. In the specific illustrative embodiment, the removable media is electronic (flash) memory. The web site is implemented with software running on a server which translates the ID signal into a human readable identification (e.g., title and artist) of the music or data selected. The user then either downloads the desired selection through the web site or places an order for delivery of physical media (e.g., a CD) on which the desired selection is stored.
Owner:SIRIUS XM RADIO INC
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