×

Digital subscriber line transmission method, apparatus and system

  • US 7,286,495 B2
  • Filed: 06/23/2005
  • Issued: 10/23/2007
  • Est. Priority Date: 05/21/1999
  • Status: Expired due to Fees
First Claim
Patent Images

1. A digital subscriber line transmission method for transmitting downstream data from a device on an office side to a device on a subscriber side and upstream data from the device on the subscriber side to the device on the office side over a single line by switching between these data transmissions in time-division fashion, dividing data of one symbol, modulating carrier waves having different frequencies by each item of divided data and frequency-multiplexing the modulated signals, and transmitting the frequency-multiplexed signals in bursts a few symbols at a time, wherein the bursts are contiguous transmit burst symbol sequences, said method comprising the steps of:

  • generating a pilot-tone signal with which synchronous processing of the symbol sequences is executed;

    making the length of an interval between the contiguous transmit burst symbol sequences, in which no frequency-multiplexed signals are transmitted, a whole-number multiple of the cycle of the pilot-tone signal; and

    assuring continuity of sample data in the contiguous transmit burst symbol sequences by executing processing of the symbol sequences in sync with the pilot-tone signal.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×