Patent ID: 9749041
Date: 2017-08-29
CPC Classifications: H04B

Claim:
1. A method of re-baselining a line monitoring system (LMS) of an optical communication system after a change to the system, wherein before the change to the system the LMS was configured to use previous LMS baseline data comprising loop gain data representative of gain imparted to a first test signal through each of a plurality of loop back paths of the system, each of said loop back paths coupling a first fiber optic path for carrying signals in a first direction and a second fiber optic path for carrying signals in a second direction opposite to the first direction, and wherein before the change to the system the previous LMS baseline data was used to identify a previous unrepaired fault that was not repaired before the change to the system, the method comprising: obtaining LMS current measurement loop gain data representative of gain imparted to a second test signal through each of the plurality of loop back paths of the system after the change to the system; modifying said LMS current measurement loop gain data by, at least in part, injecting data representative of a fault pattern of a fault signature associated with the previous unrepaired fault into said LMS current measurement loop gain data, wherein injecting data representative of a fault pattern includes subtracting at least one value representative of a gain value of said fault pattern from a corresponding gain value of said LMS current measurement loop gain data; and storing said modified LMS current measurement loop gain data as a new LMS baseline data in order to re-baseline said system.