Patent ID: 7899158
Filing Date: 2011-03-01
Classification: H04J,H04Q

Abstract:
1. A method comprising: setting a high threshold equal to a bit-error rate threshold of a network element in a network under test; generating a test signal; supplying the test signal to an input of the network under test; receiving the test signal, exhibiting a bit-error rate, from an output of the network under test; designating, as the start time of a service disruption, a time when the bit-error rate of the received test signal exceeds the high threshold; designating, as the start time of a measured settling period, a time when the bit-error rate of the received test signal falls to a pre-set low threshold; after the measured settling period start time, designating, as a measured settling period, a time period during which the received bit-error rate remains equal to or below the low threshold; designating, as the end time of the service disruption, a time when the measured settling period reaches a pre-set settling period; designating, as the determined service disruption interval, the time difference between the service disruption start time and the service disruption end time; and outputting the determined service disruption interval.