Telecommunications Industry AssociationTR-30.3/

ITU-T G.1050/TIA-921 IP Network Model Overview February 22, 2007 Jack Douglass Chairman TR30.3 Director Technical Marketing Spirent Communications

3 Network Impairments and Parameters that Affect 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)  Occupancy (Background Traffic, Congestion, Network Load)  Route Flapping  Network faults  Link Failures  Signaling protocol issues  Video Only Impairments  Video coding algorithms  Fixed, Variable, Capped Bit Rate  Transcoding

4 ITU-T G.1050 and TIA-921 IP Network Model 1000BaseX 100BaseT Switch 100BaseT Hub 10BaseT WLAN (~4Mbps) Occupancy level Packet loss 64kbps 128kbps 256kbps 384kbps 512kbps 768kbps T1/E1 T3/E3 xDSL Cable Fiber Occupancy level Qos Edge Router LAN A Core IP Network DUT A Route flapping Link Failures One-way delay Jitter Packet loss Packet Reorder Local Access A DUT B LAN B Local Access B 64kbps 128kbps 256kbps 384kbps 512kbps 768kbps T1/E1 T3/E3 xDSL Cable Fiber Occupancy level Qos Edge Router 1000BaseX 100BaseT Switch 100BaseT Hub 10BaseT WLAN (~4Mbps) Occupancy level Packet loss General Model for Voice, Data or Video

5 TIA-921A (PN RV2) New IP Network Impairment Model for IPTV Core IP Network Route flapping Link Failures One-way delay Jitter Packet loss Packet Reorder DUT B LAN B Local Access B ADSL2 Bonded ADSL2 VDSL WiMax 3G Wireless Cable PON Occupancy level Qos Edge Router 1000BaseX 100BaseT Switch 100BaseT Hub 10BaseT WLAN (~4Mbps) Occupancy level Packet loss DUT A New Model for IPTV

6 ITU-T G.1050 and TIA-921 Test Profiles ITU-T Recommendation Y.1541 uses a similar approach, but there is not a one-to-one mapping. Service Test ProfilesApplications (Examples)Node MechanismsNetwork Techniques Well ‑ Managed IP Network (Profile A) 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 Partially-Managed IP Network (Profile B) 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) Lower quality video and VoIP, signaling, transaction data (highly interactive) Separate queue, drop priority Constrained routing and distance Transaction data, interactiveLess constrained routing and distances Short transactions, bulk data (low loss) Long queue, drop priorityAny route/path Traditional Internet applications (default IP networks) Separate queue (lowest priority) Any route/path

7 ITU-T G.1050 and TIA-921 Test Profiles based on ITU-T Y1541 Different test profiles for different Service Level Agreements (SLAs) Profile A – Well-Managed Network Impairment Ranges Y.1541 QoS Level – suitable for high quality video and VoIP Most Service Providers will be supporting this SLA for IPTV

8 ITU-T G.1050 and TIA-921 Test Profiles based on ITU-T Y1541 Different test profiles for different Service Level Agreements (SLAs) Impairment TypeUnitsRange (min to max) One Way Latencyms50 to 200 (regional) 50 to 400 (intercontinental) Jitter (peak to peak)ms0 to 150 Sequential Packet Lossms40 to 200 Rate of Sequential Losssec -1 < Random Packet Loss%0 to 2 Reordered Packets%0 to 0.01 Profile B – Partially-Managed Network Impairment Ranges Y.1541 QoS Level – suitable for Lower quality video and VoIP

9 ITU-T G.1050 and TIA-921 Test Profiles based on ITU-T Y1541 Different test profiles for different Service Level Agreements (SLAs) Impairment TypeUnitsRange (min to max) One Way Latencyms50 to 800 Jitter (peak to peak)ms0 to 500 Sequential Packet Lossms40 to 10,000 Rate of Sequential Losssec -1 < Random Packet Loss%0 to 20 Reordered Packets%0 to 0.1 Profile C – Un-Managed Network Impairment Ranges Y.1541 QoS Level – Internet little or no guarantees

10 ITU-T G.1050 and TIA Impairment Severity Combinations Impairment Severity Combinations Severity=>ABCDEFGH* ImpairmentUnits Profie A LOO% Profile B LOO% Profile C LOO% Source Location (A) Parameters LAN A Occupancy% Access A Occupancy% MTU Abytes Core Network Impairments Route flap intervalseconds Route flap delayms Delayms Jitter (peak to peak)ms Link fail intervalseconds Link fail durationms Packet loss% Reordered packets% Destination Location (B) Parameters Access B Occupancy% MTU Bbytes LAN B Occupancy%

11 ITU-T G.1050 and TIA-921 LAN and Access Rates Access Rates for Home Locations Access Rates for Business Locations LAN Rates for Business Locations LAN Rates for Home Locations General – 133 LAN/Access Rate Combinations IPTV Video – 3 LAN/Access Rate Combinations Home Rates Business Rates LAN RateLOORepresents Mbit/s% b, 10BaseT hub g, 100BaseT hub LAN RateLOORepresents Mbit/s% b, 10BaseT g, 100BaseT hub BaseT switched, Gbit Ethernet Access RateLOORepresents Toward coreFrom core% kbit/s Cable, ADSL Cable, ADSL Cable, ADSL Access RateLOORepresents Toward coreFrom core% kbit/s ADSL entry ADSL premium T T3 LAN and Access Rates (New Revision of Standard/Recommendation) will change as network conditions change

12 TIA-921A (PN RV2) New LAN and Access Rates for IPTV Access Rates for Large Business Locations Access RateLOORepresents Toward coreFrom core% kbit/s 3,07230,0005WiMax 13, G Wireless, WiMax Access Rates for Home Locations applications > 3Mb/s Access RateLOORepresents Toward coreFrom core% kbit/s 7687,00050Cable, ADSL2, VDSL 1,02420,00020Bonded ADSL2, VDSL 3,07230,00015Cable, Bonded ADSL2, VDSL 3,07250,00015Cable, PON LAN Mbps Access (Kbps) To CoreFrom Core , ,02420, ,07230, ,07250, , , ,02420, ,07230, ,07250, ,000 New LAN and Access Rate for IPTV 10 LAN/Access Rate Combinations for IPTV

13 Impairment Characteristics Good Bad Severe General Model – 1064 ICs, IPTV 24 ICs New IPTV Model – 80 ICs Link Failure Route Flap Impairment Characteristics

14 ITU-T G.1050 and TIA-921 Example of Network Model Coverage (NMC) Curve OR Video Quality may also be plotted

15 Example: Using G.1050/TIA-921 to Test Video Quality Video Stream outputReceived Video Stream G.1050 TIA921 IP Network Impairment Emulator Video Streaming Server (VSS) Video Quality Measurement System Video Streaming Client (VSC) VLC Video Monitor 131A to 133H Impairment Conditions 3 Minutes per Impairment Combination Video Quality Measurements MPEG2 and H.264 Video Streams

16 G.1050/TIA-921 IP Impairments Example Video Testing 131A 131B 131C 131D 131E 131F 131G 131H 24 ICs 131A to 133H

17 Example Video Quality (V-Factor) – MPEG2 G.1050/TIA-921 IP Impairements MPEG Video Quality in the presence of G.1050/TIA-921 IP Impairments MPEG2 video has a higher quality than H.264 Video under the same G.1050/TIA-921 IP Impairments

18 Example: Video Quality (V-Factor) – H.264 G.1050/TIA-921 IP Impairements H.264 Video Quality in the presence of G.1050/TIA-921 IP Impairments H.264 video has a lower quality than MPEG2 Video under the same G.1050/TIA-921 IP Impairments

19 Example of How to Use TIA-921/G.1050 in ETSI TS x NGN IMS overview (from ES ) G.1050 TIA921 IP Network Impairment Emulator

20 Liaison with TIA-TR30.3  Project for IP impairment for IMS/NGN  Include access characteristics in current project  Open up new project specific to IMS/NGN  TIA TR30.3  TIA-921  ITU-T SG-12  G.1050