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US 9,866,314 B2Granted
Protection switching method and apparatus for minimizing data loss in optical transport network system
AssigneeElectronics and Telecommunications Research Institute
InventorSeung Woo Lee
Life of this patent
Estimating the term…
Abstract
Provided is a linear automatic protection switching (APS) apparatus and method that minimizes a data loss in an optical transport network (OTN) system, the apparatus and method that may maintain time synchronization by transmitting/receiving time synchronization signals between APS apparatuses of a working path and a redundant path, and transmitting/receiving time synchronization signals between local and remote APS apparatuses.
Claims19
A linear automatic protection switching (APS) apparatus in an optical transport network (OTN) system, the apparatus comprising:
- a receiver configured to receive signal defect information of a first transmission medium belonging to a redundant path and a second transmission medium belonging to a working path, and command information of an operator;
- a controller configured to generate a switching command to change traffic paths of the first transmission medium and the second transmission medium and switching information corresponding to the switching command based on the signal defect information and the command information, and determine a switching over time to execute the switching command;
- and
- a transmitter configured to transmit the switching command and the switching over time, and
- wherein the transmitter is configured to transmit a first time synchronization signal of the first transmission medium to the second transmission medium,
- the receiver is configured to receive a second time synchronization signal of the second transmission medium, and
- the controller is configured to perform time synchronization between the first transmission medium and the second transmission medium based on the first time synchronization signal and the second time synchronization signal.
4 more elements
A linear automatic protection switching (APS) apparatus in an optical transport network (OTN) system, the apparatus comprising:
- a receiver configured to receive, from a first transmission medium belonging to a redundant path, a switching command to change traffic paths of the first transmission medium and a second transmission medium belonging to a working path, switching information corresponding to the switching command, and a switching over time to execute the switching command;
- a controller configured to execute the switching command at the switching over time;
- and
- a transmitter configured to transmit signal defect information of the second transmission medium to the first transmission medium, and
- wherein the receiver is configured to receive a first time synchronization signal of the first transmission medium,
- the controller is configured to perform time synchronization between the first transmission medium and the second transmission medium based on the first time synchronization signal and a second time synchronization signal of the second transmission medium, and
- an OTN framer of the second transmission medium is configured to open/close the traffic path of the second transmission medium at the switching over time.
4 more elements
A linear automatic protection switching (APS) method comprising:
- performing time synchronization between a first transmission medium belonging to a redundant path and a second transmission medium belonging to a working path based on a time synchronization signal of the first transmission medium and a time synchronization signal of the second transmission medium;
- performing time synchronization between the first transmission medium and a third transmission medium belonging to the redundant path by transmitting the time synchronization signal of the first transmission medium to the third transmission medium;
- performing time synchronization between the third transmission medium and a fourth transmission medium belonging to the working path based on a time synchronization signal of the third transmission medium and a time synchronization signal of the fourth transmission medium;
- generating a first switching command to change traffic paths of the first transmission medium and the second transmission medium and a switching over time to execute the first switching command based on signal defect information of the first transmission medium and the second transmission medium and command information of an operator;
- generating an APS frame comprising the first switching command and the switching over time by executing an APS protocol;
- generating a second switching command to change traffic paths of the third transmission medium and the fourth transmission medium based on the APS frame;
- opening/closing the traffic paths of the first transmission medium and the second transmission medium at the switching over time based on the first switching command;
- and
- opening/closing the traffic paths of the third transmission medium and the fourth transmission medium at the switching over time based on the second switching command.
6 more elements
Dependencies are inferred from the claim text.