US Patent 8189487 Determination of application latency in a network node

A method of operating a communication system to determine latent applications in a communication network comprises transferring a first packet comprising a first test code to a network node, receiving the first packet in the network node, and in response to the first test code, time stamping the first packet. The method further comprises, in the test server, determining a node latency of the network node based on the time stamps, and if the node latency is greater than a first threshold, then transferring a second packet comprising a second test code to the network node, and in the network node, receiving the second packet, and in response to the second test code, time stamping the second packet. The method further comprises, in the test server, determining an application latency of an application based the time stamps, and if the application latency is greater than a second threshold, then receiving application data associated with the application.