Method to determine a switching moment and a line terminator, a control network unit and a network unit realizing such a method and a tree-like optical network including such a line terminator, such a control network unit or such a network unit
US6239887A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Sep 22, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0064
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method to determine a switching moment (Ti) of a switch (SWi) is provided. The switch is coupled to an optical combiner (OC) of a tree-like optical network. The optical combiner enables multiple access of information signals (IN1, . . . , INi, . . . INn) which are upstream transmitted from network units (NU1, NU1', NU1", . . . , NUi, . . . , NUn) to a line terminator (LT) via the cascade connection of dedicated branches (B1, . . . , Bi, . . . , Bn), the optical combiner and a common branch (BC). The switch passes an information signal (INi) at an approximated switching moment (APP-Ti) when the information signal is present and interrupts the branch when the information signal is not present. The method includes the steps of: a) capturing downstream grant information by a control network unit (CTRL-NU) which is coupled between the switch and the line terminator; and b) determining the approximated switching moment by the control network unit based upon the downstream grant information; and c) upstream transmitting by one of the network units coupled to this one dedicated branch a predefined bit pattern (PAT) similar to the information signal. In the event when the predefined bit p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.