H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/26 (2006.01) H04B 10/20 (2006.01) H04J 3/06 (2006.01) H04Q 11/00 (2006.01)
Patent
CA 2282911
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 pattern is passing through the switch, the predefined bit pattern is truncated and a truncated bit pattern (PAT-TR) is provided which is related to the approximated switching moment; and d) detecting by the line terminator reception of the truncated bit pattern; and e) determining by the line terminator a measure of how much the predefined bit pattern is truncated and providing thereby a truncation measure (.TR); and f) calculating in function of the truncation measure a calibration value (CAL- SWi) for the switching moment; g) providing the calibration value to the control network unit in order to determine the switching moment in function of the calibration value and the approximated switching moment.
Martin Claire
Slabbinck Hans
Van de Voorde Ingrid Zulma Benoit
Vetter Peter Johannes
Alcatel
Robic
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