Resources Contact Us Home
DSL auto baud

Image Number 6 for United States Patent #6570915.

A DSL communication system including a DSL transmission unit at a central office (DTU-C) and a DSL transmission unit at a remote location (DTU-R) in communication over a communication link. DTU-C and DTU-R are capable of transmitting and receiving packets of data prior to synchronization or training. DTU-C transmits a discovery message to DTU-R and awaits receiving a discovery response message from DTU-R. After receiving the discovery response message, DTU-C transmits a probe message to DTU-R followed by a probe signal. DTU-R measures the line quality while receiving the probe signal. After receiving the probe signal, DTU-R transmits a probe signal to DTU-C, using which signal DTU-C measures the line quality. After transmitting the probe signal, DTU-R transmits a probe response message, including line quality measurements performed by DTU-R. DTU-C and DTU-R may negotiate a first data rate by transmitting data rate messages based on the line quality measurements. DTU-C and DTU-R synchronize or train at the first data rate. After synchronization, DTU-C and/or DTU-R measure the line quality at the first data rate. The line quality may be measured based on bit-error-rate, attenuation level and/or signal-to-noise ratio. A second data rate is then selected based on the line quality measurements. DTU-C may then initiate a rate change request, according to which DTU-C and DTU-R may re-synchronize at the second rate.

  Recently Added Patents
Bio-stimulant for improved plant growth and development
Functionalized main chain polymers
Location-based method to specify ratio frequency spectrum rights
Optical scanner and image-forming device
Multilayered ceramic electronic component and fabrication method thereof
Photographic printing paper and method of making same
  Randomly Featured Patents
Suggesting targeting information for ads, such as websites and/or categories of websites for example
Laminated draped shield for CPP read sensors
Toepiece for ski binding
Air mattress
Furniture constructing kit
Process for producing and cooling titanium dioxide
Imaging device
Information recording method, method for reproducing recorded information, and apparatus therefor
Endoscopic suture systems
Composite helicopter swashplate