H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/20 (2006.01) H04B 10/00 (2006.01) H04B 10/08 (2006.01) H04B 10/207 (2006.01) H04Q 11/00 (2006.01) H04J 3/06 (2006.01)
Patent
CA 2368552
An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit, (2) a protection OSU of a protection circuit, and (3) one or more optical network terminals (ONTs), where an ONT has (i) a working line termination (LT) unit of the working circuit and connected to the optical splitter via a working optical fiber and (ii) a protection LT unit of the protection circuit and connected to the optical splitter via a protection optical fiber. The present invention enables fast protection switching from the working circuit to the protection circuit. The arrival times of corresponding downstream cells are measured at both the working and protection LT units of the ONT, and information related to the arrival times is transmitted from the ONT to the protection OSU. A propagation delay value is generated based on the transmitted information for use by the protection OSU for communications with the ONT if and when protection switching is implemented upon detection of a failure in the working circuit.
Eijk P. Van
Even Reed Kamenetsky
Heyningen Piet
Jiang Song
Kim Kyeong-Soo
Kirby Eades Gale Baker
Lucent Technologies Inc.
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