Resources Contact Us Home
DSL auto baud

Image Number 7 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
Substituted phenylsulfur trifluoride and other like fluorinating agents
Portable hand-held multi-function device for storing, managing and combining rewards
Method to dynamically tune precision resistance
Bandpass filter and radio communication module and radio communication device using the same
Boundary acoustic wave device
Therapeutic human anti-IL-1R1 monoclonal antibody
Estimating optical characteristics of a camera component using sharpness sweep data
  Randomly Featured Patents
Flash tank design and control for heat pumps
Non-contact linear position sensor for motion control applications with inductive attenuating coupler
Flytrap for drowning flies therein
Circuit board housing with molded in heat tab
Amusement ride assembly and method
Crackle finish
Dynamic memory cell of the charge transfer type applicable in particular to a shift register
Inhibitor of stem cell proliferation and uses thereof
Rotational molded article and method
Method for making sulfur dioxide-containing gas stream