Recommendation ITU-T G.1050 describes an IP Network Model that can be used for of evaluating the performance of IP streams. The focus is on packet delay, delay variation, and loss. IP streams from any type of network device can be evaluated using this model. The following are possible uses for the Recommendation G.1050: o Simulate Real-World IP network impairments (packet delay variation and packet loss characteristics) o Test any type of IP stream(s) under simulated network conditions using pcap files. The IP stream(s) can be evaluated using standard test cases or user-define simulated network conditions. o Test any type of IP stream using hardware emulation of simulated network model using standard test cases or user define simulated network conditions This revision of Recommendation G.1050 replaces Recommendation G.1050 (2007) in its entirety. Technical changes from G.1050 (2007) include: 1. Revised G.1050 models the mechanisms that contribute to packet delay, jitter, and loss: interfering streams, queue delays in network elements, and the characteristics of specific access technologies. The intent is to provide more realism than the earlier version. 2. G.1050 (2007) defined a Gilbert-Elliott mathematical model that fit certain observed network behavior but was not easily extended to other scenarios. The new approach is based on discrete event simulation. 3. The "likelihood of occurrence" concept is no longer applied to IP networks. 4. Revised G.1050 is a true bidirectional model. 5. Impairment levels are updated to keep current with evolving IP networks. 6. The number of standard test cases is greatly reduced. 7. Users can customize test cases to fit their specific needs. An electronic attachment (G1050-annexF.iso) that is part of the Recommendation is available for downloadable from the ITU web site. The electronic attachment contains the following files. ./src Discrete Event Simulator Source (Annex B) ./pcap Input Packet Capture Files of Interfering Traffic (Annex C) ./tc Impairment Combination Standard Test Cases (Clause 5.2) ./out Simulator Output (Annex D)

For the purpose of the AAP process a link to the electronic attachment to this Recommendation is provided in Annex F.