Patent ID: 8488746

Claim:
A method, comprising: performing a first diagnostic test on a first class of service on a network link during a current measurement period; performing a second diagnostic test on a second class of service on the network link during the current measurement period; determining whether an alert was present during a previous measurement period; generating a current failure alert based on the first diagnostic test on the first class of service indicating data loss, and the second diagnostic test on the second class of service indicating no data loss, and an alert was present during the previous measurement period; performing a further diagnostic test on the first class of service on the network link during the current measurement period, wherein the current failure alert is test also generated if the further diagnostic test on the first class of service detects data loss, the second diagnostic test on the second class of service indicates no data loss, and an alert was present during the previous measurement period; and wherein the current failure alert is a silent trunk failure alert when both the first and the further diagnostic tests of the first class of service detect data loss and the second diagnostic test of the second class of service detects no data loss.