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Transcript
Telecommunications Industry Association TR-30.3/05-12-043 Document Cover Sheet Project Number PN-3-0062 Document Title TIA-921+G.NIMM Presentation 10-17-05 at ITU-T SG12 and SG9 Source Spirent Communications Contact Name: Jack Douglass 25701 Patterson Place Laguna Hills, CA 92653 Distribution TR-30.3 Intended Purpose of Document (Select one) X Phone: 949-436-0663 Fax: Email: [email protected] For Incorporation Into TIA Publication For Information Other (describe) - The document to which this cover statement is attached is submitted to a Formulating Group or sub-element thereof of the Telecommunications Industry Association (TIA) in accordance with the provisions of Sections 6.4.1–6.4.6 inclusive of the TIA Engineering Manual dated March 2005, all of which provisions are hereby incorporated by reference. Abstract This document is a presentation that was given at the ITU-T SG12 and SG9 meetings in Geneva Oct 17 to 21 concerning TIA-921 and G.NIMM. v1.0 - 20050426 TIA-921 (PN-3-0062) and ITU-T G.NIMM Network Model for Evaluating Multimedia Transmission Performance Over Internet Protocol Jack Douglass, Spirent Chair TIA TR30.3 October 2005 Q13/12 D115 (TIA-921) Q13/12 D114 (G.NIMM Draft 2) Q4/9 TD168 (G.NIMM Draft 2) TIA-921 (PN-3-0062) and ITU-T G.NIMM Types of DUTs IP Phones POTS over IP Media Gateways MGC User Agents Call Agents Media Servers Video Gatekeepers Application Servers Edge Routers Gateways Modems Fax IP Network Impairment Emulator Based on TIA-921 and ITU-T G.NIMM Source Device Under Test Ethernet IP Network Impairment Emulator Ethernet Destination Device Under Test TIA-921 (PN-3-0062) and ITU-T G.NIMM Network Model for Evaluating Multimedia Transmission Performance TIA-921 / ITU-T G.NIMM TIA-921 and ITU-T G.NIMM IP Network Model DUT A LAN A 1000BaseX Local Access A Core IP Network Local Access B LAN B 100BaseT Switch 100BaseT Hub 10BaseT WLAN (~4Mbps) ----------------Occupancy level Packet loss 64kbps Route flapping 64kbps 1000BaseX 128kbps One-way delay 128kbps 100BaseT Switch 256kbps Jitter 256kbps 100BaseT Hub 384kbps Packet loss 384kbps 10BaseT 512kbps 512kbps WLAN (~4Mbps) 768kbps 768kbps ----------------- T1/E1 T1/E1 Occupancy level T3/E3 T3/E3 Packet loss ADSL ADSL Cable Cable Fiber Fiber ---------------- ---------------- Occupancy level Occupancy level Qos Edge Router Qos Edge Router DUT B Network Impairments and Parameters that Affect Voice and Video Quality • • • • • • • • • Network Architecture Types of Access Links QoS controlled Edge Routing MTU Size Packet Loss (Frame Loss) Out of order packets One Way Delay (Latency) Variable Delays (Jitter) Background Traffic (Occupancy) • • • • • Timing Drift Route Flapping Signaling protocol mismatches Network faults Link Failures TIA-921 and ITU-T G.NIMM Test Profiles Based on QoS Classes Service Test Profiles QoS Class (Y.1541) Applications (Examples) Node Mechanisms Well-Managed IP Network (Profile A) 0 High quality video and VoIP, VTC (Real-time applications, loss sensitive, jitter sensitive, high interaction) Strict QoS, guaranteed no over subscription on links Constrained routing and distance Best-Effort IP Network (Profile B) 1 VoIP, VTC (Real-time applications, jitter sensitive, interactive) Separate queue with preferential servicing, traffic grooming Less constrained routing and distances Unmanaged IP Network, Internet (Profile C) 2 Lower quality video and VoIP, signaling, transaction data (highly interactive) Separate queue, drop priority 3 Transaction data, interactive 4 Short transactions, bulk data (low loss) Long queue, drop priority 5 Traditional Internet applications (default IP networks) Separate queue (lowest priority) Network Techniques Constrained routing and distance Less constrained routing and distances Any route/path Any route/path • Statistically based models for different QoS Classes TIA-921 and ITU-T G.NIMM Test Profiles Based on QoS (Y.1541) Classes Different test profiles for different Service Level Agreements (SLAs) Impairment Type Units Range Impairment Type Units Range Impairment Type Units Range Jitter (Peak to Peak) ms 0 to 40 Jitter (Peak to Peak) ms 0 to 150 Jitter (Peak to Peak) ms 0 to 500 One Way Average Latency ms 20 to 60 One Way Average Latency ms 50 to 200 One Way Average Latency ms 50 to 800 Sequential Packet Loss # of sequential packets Sequential Packet Loss # of sequential packets 2 to 5 Sequential Packet Loss # of sequential packets 2 to 500 < 10-3 Rate of Sequential Loss sec-1 < 10-1 Rate of Sequential Loss Rate of Sequential Loss sec-1 sec-1 0 to 2 0 to 20 0 to 0.05 Random Packet Loss % Random Packet Loss Random Packet Loss % % 0 to 0.1 0 to 10 0 to 0.001 Out of Sequence Packets % % Out of Sequence Packets % Out of Sequence Packets Random loss only Profile A Well Managed Network Impairment Ranges Table 2 Profile B Best Effort Managed Network Impairment Ranges Table 3 Profile C Un-Managed Network Impairment Ranges Table 4 TIA-921 and ITU-T G.NIMM 8 Impairment Severity Combinations Severity=> Impairment A B C D E F G H Units Profile A LOO % 50 30 15 5 0 0 0 0 Profile B LOO % 5 25 30 25 10 5 0 0 Profile C LOO % 5 5 10 15 20 25 15 5 Source Location (A) Parameters LAN A Occupancy % 1 2 3 5 8 12 16 20 Access A Occupancy % 0 1 2 4 8 15 30 50 512 512 1508 1508 1508 1508 1508 1508 MTU A bytes Core Network Impairments Route flap interval seconds 0 3600 1800 900 480 240 120 60 Route flap delay ms 0 2 4 8 16 32 64 128 Delay ms 4 8 16 32 64 128 256 512 Jitter (peak to peak) ms 5 10 25 40 70 100 150 500 Link fail interval seconds 0 3600 1800 900 480 240 120 60 Link fail duration ms 0 64 128 256 400 800 1600 3000 Packet loss % 0 0.01 0.02 0.04 0.1 0.2 0.5 1 Reorder factor % 0 1 2 3 4 6 8 10 Destination Location (B) Parameters Access B Occupancy MTU B LAN B Occupancy % bytes % 0 1 2 4 8 15 30 50 512 512 1508 1508 1508 1508 1508 1508 1 2 3 5 8 12 16 20 Table 10: Impairment Severity Combinations TIA-921 and ITU-T G.NIMM LAN and Access Rates Home Rates LAN Rate LOO Mbit/s % Access Rate LOO Toward core From core kbit/s kbit/s Represents % Represents 4 75 802.11b, 10BaseT hub 128 768 40 Cable, ADSL 20 25 802.11g, 100BaseT hub 384 1536 50 Cable, ADSL 384 3000 10 Cable, ADSL Table 5: LAN Rates for Home Locations Table 7: Access Rates for Home Locations Business Rates LAN Rate LOO Mbit/s % Represents 4 20 802.11b, 10BaseT 20 20 802.11g, 100BaseT hub 100 60 100 BaseT switched, Gbit Ethernet Table 6: LAN Rates for Business Locations Access Rate LOO Toward core From core kbit/s kbit/s Represents % 384 1536 40 ADSL entry 384 3000 15 ADSL premium 1536 1536 40 T1 43000 43000 5 T3 Table 8: Access Rates for Business Locations LAN and Access Rates (New Revision of Standard/Recomendation) will change as network conditions change 133 LAN/Access Rate Combinations TIA-921 and ITU-T G.NIMM Statistically Based IP Network Impairment Conditions (ICs) based on SLAs Call Quality Metric IC– 96A Probability (LOO = 0.00256% ) Impairment Condition TIA-921 and ITU-T G.NIMM Statistically Based IP Network Impairment Conditions (ICs) based on SLAs Call Quality Metric IC– 96E Probability (LOO = 0.01025% ) Impairment Condition TIA-921 and ITU-T G.NIMM Statistically Based IP Network Impairment Conditions (ICs) based on SLAs Call Quality Metric Route Flap Link Failure Impairment Condition IC– 96H Probability (LOO = 0.00256%) TIA-921 and ITU-T G.NIMM Example of Network Model Coverage Curve • Test Results from 1064 Statistically based IP Network Impairment Combinations. • The Network Model Coverage curves may be used to test the performance of a set of devices across a range of impairment conditions for a given quality metric. OR TIA-921 and ITU-T G.NIMM Example of Network Model Coverage Curve R-Factor - Listening Quality vs. TIA-921 Network Model Coverage (G.711 PLC, 40 ms. jitter buffer) 100 • Test Results from 1064 Statistically based IP Network Impairment Combinations. 90 80 70 R-LQ 60 Profile ANetwork Model •TestThe Test Profile B Test Profile C Coverage curves may be used to test the performance of a set of devices across a range of impairment conditions for a given quality metric. 50 40 30 20 10 0 0% 10% 20% 30% 40% 50% 60% % Network Model OR 70% 80% 90% 100% History of TR30.3 Network Model 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, which became ITU-T Recommendation V.56bis-1995 • EIA/TIA TSB 38-1994: Test Procedures for Evaluation of 2-Wire 4 Kilohertz Voice Band Duplex Modems, which became 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 TR30.3 Liaison Activities • Liaisons activities between TR30.3 and appropriate committees to develop TIA-921 (PN-3-0062), Network Model for Evaluating Multimedia Transmission Performance Over Internet Protocol – TR41.4 – TR45.5 – ITU-T SG12 – ITU-T SG9 – ITU-T SG15 • Working with Operating Companies and Service providers to provide statistically accurate IP network impairment model TIA-921 Target Audience for Network Model • • • • • • Network Equipment Manufacturers Operating Companies Service Providers Design Engineers Test houses Magazines and product reviewers