| 摘要 |
An optical transmission system controls an ALS (Automatic Laser Shutdown) function using a message. The optical transmission system includes first and second optical repeaters. The first optical repeater monitors a plurality of optical lines incoming from the second optical repeater to detect a line loss. Upon detection of the line loss, the first optical repeater designates an optical line in an opposite direction of a defective optical line having the line loss, and transmits a request message for performing the ALS function to the second optical repeater through the designated optical line. The request message includes information about the defective optical line. Upon reception of the request message, the second optical repeater analyzes the received request message and performs the ALS function for the defective optical line, and transmits a response message after performing the ALS function to the first optical repeater through an optical line paired with the defective optical line. The first optical repeater then completes the ALS function for the defective optical line, upon reception of the response message.
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