Optical access system and ranging method for optical access system
US7881609B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 2007 |
| Grant date | Feb 1, 2011 |
| Priority date | — |
| Expiry date | Sep 16, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0088
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A ranging signal R1 generated by a signal generator and reaches to a signal checker via a working system transmission line, a loop circuit, and an auxiliary system transmission line. The signal checker measures a delay time from the generation to the arrival of the signal R1. A ranging signal R2 generated by the signal generator and reaches to a signal checker via an auxiliary system transmission line, a loop circuit, and an auxiliary system transmission line. The signal checker measures a delay time from the generation to the arrival of the signal R12. A delay time of the working system transmission line is calculated from the delay times of the signals R1 and R2. Disruption of the services provided by the other ONUs can be prevented since the working system transmission line is not used for upstream communication of the ranging signals R1 and R2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.