DETECTION OF DATA CONNECTION LOSS

A method of identifying loss of data connection in one or more links between an exchange and one or more of a plurality of optical network terminals arising during presence of a user at an intervention point node on the links between the exchange and the one or more optical network terminals, comprising - receiving connection information about loss of data connection on any one of the links between the exchange and the one or more of the plurality of the optical network terminals, - receiving duration information about duration of the user presence at the intervention point node, - determining if the loss of data connection on any one of the links occurred within the user presence duration, - causing line tests to be conducted on each of the links for which loss of data connection is determined to have occurred within the user presence duration, - receiving results of the line tests including the number of links, and - determining if the number of affected links exceeds a predetermined threshold number.