Patent ID: 6194707
Filing Date: 2001-02-27
Classification: H04B

Abstract:
An automatic laser shutdown (ALS) method in an optical transmission system, comprising the steps of:monitoring, at a first optical repeater, a plurality of optical lines incoming from a second optical repeater to detect a line loss;upon detection of the line loss, designating, by the first optical repeater, an optical line in an opposite direction of a defective optical line having the line loss;transmitting, by the first optical repeater, a request message for performing an automatic laser shutdown (ALS) function to the second optical repeater through the designated optical line, the request message including information about the defective optical line;analyzing, at the second optical repeater, the request message received and performing the automatic laser shutdown (ALS) function for the defective optical line, after reception of the request message;transmitting a response message after performing the automatic laser shutdown (ALS) function from the second optical repeater to the first optical repeater through an optical line paired with the defective optical line; andcompleting, at the first optical repeater, the automatic laser shutdown (ALS) function for the defective optical line, after reception of the response message.