System and method to monitor network delay

A method of monitoring a network comprising operations to:

• A. receive a stream of samples, each sample having an associated network delay value that indicates an amount of time data packets associated with the sample are delayed when transmitted between first network device and second network devices coupled to a network;
• B. define at least one first group of samples, the number of samples included in each group being defined by a window size;
• C. determine a first network delay characteristic for the respective first groups, each network delay characteristic being based on the network delay values corresponding to the respective samples included in the corresponding group;
• D. apply a first test to the first network delay characteristic determined for the respective first groups;
• E. adjust the window size based on a result of the first test associated with the respective first groups;
• F. using the adjusted window size, define at least one second group of samples, each second group including samples of the stream of samples subsequent to the samples included in the at least one first group;
• G. determine a second network delay characteristic for the respective second groups;
• H. apply a second test to the second network delay characteristic determined for the respective second groups;
• and
• I. determine whether to generate an alert notification based on a result of at least one of the first and second tests.

A non-transitory computer readable storage medium and one or more computer programs embedded therein, the computer programs comprising instructions, which when executed by a computer system, cause a computer system to:

• A. receive a stream of samples, each sample having an associated network delay value that indicates an amount of time data packets associated with the sample are delayed when transmitted between first network device and second network devices coupled to a network;
• B. define at least one first group of samples, the number of samples included in each group being defined by a window size;
• C. determine a first network delay characteristic for the respective first groups, each network delay characteristic being based on the network delay values corresponding to the respective samples included in the corresponding group;
• D. apply a first test to the first network delay characteristic determined for the respective first groups;
• E. adjust the window size based on a result of the first test associated with the respective first groups;
• F. using the adjusted window size, define at least one second group of samples, each second group including samples of the stream of samples subsequent to the samples included in the at least one first group;
• G. determine a second network delay characteristic for the respective second groups;
• H. apply a second test to the second network delay characteristic determined for the respective second groups;
• and
• I. determine whether to generate an alert notification based on a result of at least one of the first and second tests.