153 results about "Bandwidth measurement" patented technology

The fast dynamic measurement of bandwidth in a TCP network environment utilizes a single pair of packets to calculate bandwidth between two entities on a network (such as the Internet). This calculation is based upon the packet-pair technique. This bandwidth measurement is extremely quick. On its journey across a network, communication devices may delay the packet pairs. In particular, TCP networks have two algorithms designed to delay some packets with the goal of increasing the overall throughput of the network. However, these algorithms effectively delay a packet pair designed to measure bandwidth. Therefore, they distort the measurement. These algorithms are Nagle and Slow Start. The fast dynamic measurement of bandwidth implements countermeasures to overcome the delays imposed by these algorithms. Such countermeasures include disabling the application of the Nagle Algorithm; minimizing the buffering of packets by sending a “push” packet right after the packet pair; and avoiding the Slow Start Algorithm by priming it with a dummy packet.

The present invention is directed to an intranet for providing on-demand Internet access to subscribers which includes a service node and a plurality of subscriber terminals coupled to the service node by corresponding xDSL lines. In turn, the service node includes a switch coupled to the xDSL lines, a gateway coupled to the Internet, a router which couples the switch to the gateway and a bandwidth measurement server coupled to the gateway. The bandwidth measurement server determines upload and / or download data transfer rates between the service node and requesting ones of said the subscriber terminals coupled thereto.

In accordance with the teachings of the present invention, a method for selecting a server to provide content to a client is presented. A media controller receives a request from a client for content. The media controller instructs a plurality of servers each storing the content required by the client to perform a bandwidth measurement referred to in the disclosure as a bandwidth probe. The result of the bandwidth probe is communicated to the media controller. The media controller selects a server (i.e., an identified server) for communication with the client based on the result and communicates the selection in the form of a redirect command to the client. The client then communicates directly with the identified server.

A bandwidth meter method and apparatus for measuring the bandwidth of a spectrum of light emitted from a laser input to the bandwidth meter is disclosed, which may comprise an optical bandwidth monitor providing a first output representative of a first parameter which is indicative of the bandwidth of the light emitted from the laser and a second output representative of a second parameter which is indicative of the bandwidth of the light emitted from the laser; and, an actual bandwidth calculation apparatus utilizing the first output and the second output as part of a multivariable equation employing predetermined calibration variables specific to the optical bandwidth monitor, to calculate an actual bandwidth parameter. The actual bandwidth parameter may comprise a spectrum full width at some percent of the maximum within the full width of the spectrum of light emitted from the laser or a width between two points on the spectrum enclosing some percentage of the energy of the full spectrum of the spectrum of light emitted from the laser. The apparatus and method may be implemented in a laser lithography light source and / or in an integrated circuit lithography tool.