Jack Douglass, Spirent Chair TIA TR30.3 November 10, 2003, TIA TR41 TR30.3 30312022

1. Network Model for Evaluating Multimedia Transmission Performance Over Internet ProtocolPN-3-0062 Will become TIA/EIA-921 Jack Douglass, Spirent Chair TIA TR30.3 November 10, 2003, TIA TR41 TR30.3 30312022 TR41.4-03-11-060-L jack.douglass@spirentcom.com

2. Purpose of Presentation • Establish a formal liaison between TR30.3 and TR41 to help develop Network Model for Evaluating Multimedia Transmission Performance Over Internet Protocol (PN-3-0062) • Other Liaisons Activities • ITU-T SG15 Questions 5, 6, 7 • ITU-T SG16 Question • IETF • Etc. • Invite TR41 members to TR30.3 meetings to work on IP Network Model • IP Network Statistics • Network Architecture • Test Scenarios

3. TR30.3 Modem Test Standards • TIA/EIA 496A-1989: Interface Between Data Circuit Terminating Equipment (DCE) and the Public Switched Telephone Network • Included Network Model for Evaluating Modem Performance • TIA/EIA TSB 37A-1994:Telephone Network Transmission Model for Evaluating Analog Modem Performance, whichbecameITU-T Recommendation V.56bis-1995 • EIA/TIA TSB 38-1994:Test Procedures for Evaluation of 2-Wire 4 Kilohertz Voice Band Duplex Modems, whichbecame ITU-T Recommendation V.56ter-1996 • ANSI/TIA/EIA 3700-1999:Telephone Network Transmission Model for Evaluating Analog Modem Performance • ANSI/TIA/EIA 793 -2000:North American Telephone Network Transmission Model for Evaluating Analog Client and Digitally Connected Server Modems • ANSI/TIA 876 – 2002: North American Network Access Transmission Model for Evaluating xDSL Modem Performance

4. Network Model Coverage (NMC) Methodology • Waterfall Curves • Traditional method of measuring modem performance • Error rate measured against single impairments such as Gaussian noise • Severe stress conditions • Network Model Coverage (NMC) • Introduced by TR30.3 in TIA/EIA-1992 TSB37 • Network Model is a portrait of the real network • Statistically based Network Model -- Likelihood of Occurrence (LOO) of a given connection • Modem performance evaluated using a Impairment Combinations and Local Loop Combinations • Curve showing Percentage of Network Model Vs Throughput • Estimates percentage of network of the real network over which the modem can be expected to operate • Compare performance of different models or manufactures of modems • Network Model is independent of modem technology

5. Network Model for Evaluating Multimedia Transmission Performance -- PN-3-0062

6. Converged Network Reference Model Diagram TIA-793 Network Model TIA-793 Network Model A D A D L L TE Telco Switch Gateway TE Telco Switch Gateway IP Network R,G,S* L L Gateway R,G,S* R,G,S* Gateway

7. Test Scenario: PSTN to PSTN connections through a managed IP network

8. Test Scenario: PSTN – IP connections

9. Test Scenario: IP – IP connections

10. Examples of Communication Equipment that can be tested over the Converged Network Model • IP Network Devices such as User Agents, Call Agents, Media Servers, Media Gateway Controllers, Gatekeepers, Application Servers, Edge Routers, Gateways • Plain Old Telephone Service (POTS) and IP telephones • Voice-over-IP (VoIP) gateways • ITU-T V-series data modems, both analog client and digitally connected server • T.30 and T.38 facsimile devices and gateways • V.150.1 and voiceband data (VBD) modem-over-IP gateways • TIA-1001 (and V.toip) textphone-over-IP gateways

11. Test Voice, Fax or Data over IP using Converged Network Model IP Simulator Analog PSTN Simulator 2 Analog PSTN Simulator 1 Voice, Video, Data, Fax, etc. Gateway Gateway Voice, Video, Data, Fax, etc.

12. Test IP Network Devices using IP Network Model IP Simulator IP Network Devices IP Network Devices

13. Network Impairments Conditions could be based on set of impairment combination that have fixed values Stress IP Network Device Impairments on a real IP Network are not fixed Example of Test Profile with Fixed Values of Network Impairments

14. Parameters that Need to be Considered when Simulating an IP Network • Network Architecture • Types of Access Links • QoS controlled Edge Routing • Route Flapping • Link Failure • Load Sharing • Time Drift • MTU Size • Background Traffic • One Way Delay

15. Example of Test Profile with Time Variable Network Impairments Packet Delay Time

16. Each Impairment Condition is assigned a Likely-hood of Occurrence (LOO) based on real IP Network Statistics, Network Architecture, Classes of Service The goal is to have approximately 100 test combinations so that an automated run of the test suite completes in less than a day. Time Varying Statistically Based IP Network Impairment Condition (IC) IC1 LOO X% IC2 LOO X% IC100 LOO X%

17. Statistically based models can be created for different QoS Classes Test Profiles Based on QoS Classes

18. Example of Network Model Coverage (NMC) Curve Parameter X Vs Network Model Coverage Percentage Device A Device B Device C QoS, PESQ, PSQM, MOS, Throughput, Connect Rate, etc. 0 0 10 20 30 40 50 60 70 80 90 100 Percentage of Network Coverage

19. Value of Converged Network Model • Predicts product performance under statistically base network conditions • Finds design weaknesses • Find compatibility issues between network equipment • Facilitates isolating and resolving field problems • Assists in evaluating different technologies

20. Target Audience for Converged Network Model • Operating Companies • Service Providers • Manufacturers • Design Engineers • Test houses • Magazines and product reviewers

21. Discussion • Comments, Suggestions and Recommendations • Input for Network Model • IP Network Statistics • Network Architecture • Test Scenarios • Invited to participate in TR30.3