Exfo EXpert IPTV Test Tools (FTB-1 / 2 Pro) Uživatelský manuál

User GuideEXpert IPTV Test Tools

10 Chapter 1 Introducing the EXpert IPTV Test Tools The EXpert IPTV Test Tools is a software platform (FTB-1, FTB-2, and FTB-2 Pro) based IPTV q

11 When used as a passive monitoring device The EXpert IPTV Test Tools is connected via a manageable switch or aggregating tap to monitor bidirection

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13 Conventions Before using the product described in this guide, you should understand the following conventions: WARNING Indicates a potentially

14 Chapter 2 Safety Information Safety Information Laser Safety Warnings WARNING Do not install or terminate fibers while a laser source is activ

15 Chapter 3 Getting Started The EXpert IPTV Test Tools application is preinstalled on the platform. If The EXpert IPTV Test Tools is not installed,

16 Chapter 4 Physical Interface Ethernet 10/100/1000 Mbits/s Ethernet Port The EXpert IPTV Test Tools uses the GigE port of the platform. Conn

17 Chapter 5 Using the Graphical User Interface This chapter describes the graphical user interface of your EXpert IPTV Test Tools application. The

18 Chapter 6 Setting the IPTV Test 6.1 Setup Interface The Expert IPTV Test Tools setup has factory defaults. Changing these defaults is nece

19 The TR101290 allows configuration or Priority 1 and 2 parameters from a separate menu as shown to the right. These color coded thresholds will the

2 Copyright © 2014 EXFO Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any f

20 For VoD streams: When Groups are exported a file with extension “.ExfoChannels” is created. Groups can be imported only from

21 Chapter 7 Running IPTV Tests 7.1 Simultaneous Testing of Multiple Channels 7.2 Passive Test The Passive Test allows monitoring of any IP

22 • Channel whose metrics and preview are currently displayed is underlined • To view metrics and preview of another channel click on it in the Te

23 7.3 Set Top Box Emulation Test The Set Top Box Emulation Test allows IGMP or RTSP join& leave requests to one or multiple IPTV streams. Onc

24 For VoD streams (uri’s): · Choose the RTSP uri to be tested from the Channel List in the STB · Click on Play button of the chosen channel in t

25 Chapter 8 Getting IPTV Metrics The channel whose metrics are currently displayed is underlined in the Test Log. 8.1 Basic IPTV Metrics

26 · Check Summary metrics for a quick signal quality. Summary provides a list of industry most used parameters for quick evaluation of IPTV servic

27 8.2 Live Stream Preview · Video and Audio preview of the channel whose metrics are currently displayed can be enabled at anytime in the main t

28 8.3 Advanced IPTV Metrics Test 8.3.1 Video Perceptual Quality Metrics As described in the technical reference section Chapter 6.1, the Perce

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3 License Agreement and Warranty IMPORTANT: CAREFULLY READ THE FOLLOWING LICENSE AGREEMENT BEFORE OPENING THIS INSTALLATION PACKAGE. BY OPENING THIS

30 8.3.2 Transport Packet Metrics Transport Packets are MPEG-TS packets that carry Packet Elementary Stream (PES). Statistics of these

31 Definitions: Stream RTP Transport Metrics for MPEG-2 Transport over RTP Stream Packet Transport Metrics

32 8.3.3 MPEG-TS TR 101290 Priority 1 Definitions: MPEG_2 Transport Stream TR 101290 Priority 1 Metrics TR 101290 Second Priority lists Error Co

33 MPEG_2 Transport Stream TR 101290 Priority 1 Metrics 8.3.4 Audio Description and Perceptual Metrics Information Audio Description Informatio

34 Definitions: Audio Stream Description Audio Perceptual Quality Metrics: Audio bandwidth Metrics:

35 8.3.5 Video Frame Metrics Video Frames (MPEG-TS) statistics provide the total number of Received and Impaired frames I, P, B and optional SI

36 Definitions: Video Frame Metrics

37 8.3.6 Video Bandwidth Definitions: Video Bandwidth Metrics Video Bandwidth of I, P, B, SI and SP frames provides a useful information for

38 8.3.7 Metrics in Graphical Form- Histograms

39 Chapter 9 Generating and Viewing Test Results 9.1 Test Results Log 9.1.1 Accessing Test Results Access to the Test Results is available fr

4 "Software" means the computer programs, source code and software components contained therein and all updates and upgrades thereto. The t

40 Test Results generated by Results button or button produce the following log: Double-clicking on the selected test record pro

41 Here is an example of the Charts screen produced for the single test record. • To generate a pdf report click on button and wait

42 The report start with the summary page followed with test metrics four pages long as shown below:

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45 Appendix A The IPTV Video Stream is subjected to multilevel analysis as shown here: A.1 Understanding IPTV Video Perceptual Quality * The pe

46 cause obvious distortion or may not even be noticed by the end user, depending on which video frame types are impaired. In addition, impairment

47 As a frame often spans multiple packets, and a typical video stream includes interpolated frames (P-frames and B-frames), a given packet loss rate

48 For inter-frame or motion-based coding (P and B frames), motion vectors are determined for each block and encoded. As for intra-frame coding, err

49 A.1.1.2 Impact of Packet Loss on Specific Video Codecs As shown in Figure 2-3, a simple non-robust video stream can be severely degraded wit

5 4. AUDITS: EXFO reserves its right to audit, at its convenience, your use of the Software. 5. TERMS OF TERMINATION: This Agreement shall remain in

50 Error mitigation algorithms are being increasingly applied to help to compensate for packet loss [11][12]. Methods include: Forward Error Correct

51 A.1.2.1 Impact of Coding Bitrate on Video Quality For a typical MPEG-2 encoded video stream with standard resolution 720x486, GOP sequence IBBP

52 The following examples illustrate the impact of the coding bitrate on video quality. Both images show the same frame from a video sequence encode

53 In Figure 2-6, the sequence was encoded at a bitrate of 1127Kbps (138KB/s). The use of coarser quantization conserves bandwidth, but creates dist

54 IPTV applications generally support video encoded with SD resolutions of 720x486 (30 Hz) or 720x576 (25 Hz), or HD resolutions of 1280x720 (720p)

55 VQmon/HD’s quality analysis algorithm considers these temporal phenomena in order to calculate perceptual quality scores that correlate as accurat

56 Figure 2-7. VQmon/HD video stream quality analysis algorithm A.2.1.1 TR 101 290 Metrics Collection VQmon/HD collects and reports the full s

57 A.2.1.4 Frame Type Detection VQmon/HD identifies individual I, P, and B frames in the GoP and measures the packet loss rate and loss distribut

58 A.2.1.7 VQmon Markov Model (VMM) VQmon/HD uses a four-state Markov Model to gather and report packet loss statistics for “burst” periods (where

59 Figure 2-8. VQmon Four-state Markov Model diagram A.2.2 Audio Stream Analysis VQmon/HD’s audio quality analysis algorithm performs real-

6 restrictions as set forth in subparagraph (c) (1) (ii) of The Rights in Technical Data and Computer Software clause at 52.227-7013. EXFO headquarte

60 A.2.3 Telchemy Video Quality Metrics VQmon/HD provides real-time perceptual quality scores, performance statistics, and extensive diagnostic

61 Table below lists some of the perceptual quality metrics reported by VQmon/HD, including acceptable ranges for each. (A complete list and descript

62 For picture quality, VQmon/HD reports both Relative MOS-V and Absolute MOS-V scores: • Relative MOS-V is an estimated perceptual quality score th

63 A.2.3.2 VQmon/HD Video Service Transmission Quality Metric - VSTQ VQmon/HD produces a video services quality metric, VSTQ (Video Service Trans

64 A.2.3.3 Degradation Factors To facilitate troubleshooting, VQmon/HD has the ability to obtain a breakdown of factors contributing to quality de

65 A.3 IPTV Protocols • IPTV uses a multilayer protocol stack to deliver the media contents. • The first 3 layers are typical for IPTV transmissio

66 MPEG frame is fixed at 188 byte, with 184 Data Payload and 4 Byte Header. The 13-bit PID indentifies Packet Elementary Stream (PES). The PES

67 The Packetized Elementary Stream is converted into the Video Elementary Stream ( MPEG-2 transport stream)

68 • PES header contain information about the contents of the PES packet. • Variable length packets typically up to 64 Kbyte but may be longer •

69 • PAT lists all programs available in the transport stream with their program ID (PID). • Each program has a PMT that lists the elementary strea

7 CONTENTS LICENSE AGREEMENT AND WARRANTY ... 3 CHAPTER 1 INTRODUC

70 A.4 PCR Jitter PCR (program counter reference) timestamps is generated by the MPEG-2 encoder and received throughout the subsequent links in t

71 A.5 IGMP Latency vs. Zap time The zap time is the total duration from the time viewer presses the channel change button, to the point the pictur

72 IGMP is the signaling protocol used to access broadcast video services that use a multicast network design to efficiently manage network bandwid

73 The IGMP latency plus the time it takes to fill the decode buffer and to decode and display the content is the total user experience time. However

74 Appendix B Technical Specification Physical Layers Supported - 10/100/1000 Ethernet, Wi-Fi 802.11 b/g/n. Recognized Video Compression Standar

75 Video Jitter Frame inter arrival jitter I frame inter arrival jitter Average frame arrival delay Peak frame arrival delay

76 Video Frames I,P,B,SI,SP – Frames received Frames impaired % frames impaired Packets received Packet lost Packet discarded % pac

77 Troubleshooting Contacting the Technical Support GroupTo obtain after-sales service or technical support for this product, contact EXFO at one of

78 Glossary Perceptual Quality Metrics Metric Description MOS-V Video MOS, a 1-5 score that considers the effect of the video codec, frame rate,

79 Video Stream Metrics The Video Stream Description provides information on the type of codec being used, Group of Pictures structure and length, im

8 CHAPTER 7 RUNNING IPTV TESTS ... 21 7.1 SIMULTANEOUS TESTING

80 Transport Metrics Packet Loss Metrics provide essential data on IPTV packet loss before and after the effects of error correction (such as FEC or

81 TR101 290 metrics provide green LED ON/OFF information on certain key error types that occur with MPEG Transport protocols, and are useful in iden

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9 A.1.1.1 Impact of Packet Loss and Jitter on Video Quality ............ 47 A.1.1.2 Impact of Packet Loss on Spe