Patent ID: 7925157
Filing Date: 2011-04-12
Classification: H04J,H04Q

Abstract:
1. A ranging method for use by an optical network unit (ONU) in a ranging system of a passive optical network that comprises the ONU and a splitter loop-back device, comprising: sending, by the ONU, an initial ranging signal to the splitter loop-back device and recording a current sending time as a first time; receiving, by the ONU, a loop-back ranging signal from the splitter loop-back device, and determining, by the ONU, whether the loop-back ranging signal is a return signal of the initial ranging signal; if the loop-back ranging signal is a return signal of the initial ranging signal, recording, by the ONU, a current receiving time of the loop-back ranging signal as a second time; obtaining, by the ONU, ranging information by calculating a difference between the first time and the second time; and performing, by the ONU, a ranging on the basis of the ranging information.