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Application Note

                         860 DSPi RTP Reflector Option

Overview
The 860 DSPi RTP Reflector Option extends the measurement and troubleshooting
range of field technicians by offering a simple round-trip VoIP quality test from any RF
test point. The option works through communication with the Tektronix DirectQuality
active monitoring system, enabling tests to verify RTP communication from the test
point to probes placed strategically throughout the cable network.

Real-Time Transport Protocol (RTP) is used to transmit IPTV, Video-on-Demand (VoD),
VoIP and other real-time media over IP networks. Tektronix’ RTP Loopback test agent
accurately simulates these media streams by supporting over 50 different audio and
video codecs, including the latest wideband VoIP, HDTV & IPTV standards.

The RTP Reflector Option enables round-trip stream analysis for packet loss, jitter,
delay and other IP impairments. R-factor, MOS and other industry-standard service
quality metrics are included based on a Tektronix E-model implementation.

The Tektronix DirectQuality server provides a PocketDQ 2.0 application that enables
browser based activation of a wide range of tests to verify IP communication
characteristics.




 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   1 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.
Application Note


860 DSPi Web Browser Configuration
The links on the 860 DSPi browser homepage
can be configured using WorkBench.




The following procedure shows how to
configure a link for “PocketDQ” or “RTP
Reflector” on the 860 DSPi. The graphic shown
to the right is the 860 DSPi Configuration
Wizard Window within WorkBench that is used
to set web browser parameters.




To configure a link for “RTP Reflector”, perform the following steps;
   1. Select the “Modify web browser parameters as defined below” radio button.
   2. Choose the link title number that you wish to change, for example, “Link 3 Title”
      and enter “RTP Reflector”.
   3. Choose the “Link 3 Address,” and change the URL to:
      http://[IP_address]/tektronix/cgi-bin/pocketdq.exe

   Note: For [IP_address] enter either the IP address of the DQ Server, or the name of
   the server, e.g. dq.trilithic.com, etc.

 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   2 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.
Application Note


Accessing the PocketDQ Application
After you have configured the 860 DSPi Web
Browser using WorkBench, enter the 860 DSPi
Web Browser mode and select the RTP
Reflector link. The PocketDQ login screen will
be displayed.




Upon successful login, the following screen is
displayed. This screen enables you to run a
test, view previous test results, or retrieve
support information.




 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   3 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.
Application Note

Test Procedure
When the user selects Test from the PocketDQ screen shown in the previous sections,
the test will start with an initiation screen as shown below:




First the user selects Test Objective, Test Origin (Call From), and Service Area. Next
the user enters IP Address or Host Name for termination device. The IP address is set
automatically when using a Trilithic 860 DSPi. The Test Duration can be set within a
range of 1 to 10 minutes. The codec used is configured in the DirectQuality server
default settings.




 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   4 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.
Application Note


Searching for Previously Run Tests
Tests that have been run previously can be found by “searching” and users can use any
combination of parameters to search for test results. The search mode entry display
example is shown below.




Search results are grouped by date, as seen in the above results display. The “State”
column provides overall Pass or Fail information. The “Phone/IP” column displays the
phone number or IP address of termination.




 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   5 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.
Application Note




The RTP Reflector top-level results display shows two results families: Speech Quality
and RTP Statistics. Drilling down by selecting the pass/fail parameter provides the
following information.




The Speech Quality results include CQ (Conversational Quality) and LQ (Listening
Quality) MOS and R-Factor.




The RTP Statistics results include 5 additional results families, each with pass/fail limits.
Each of these categories provides additional information accessible by selecting the
pass/fail parameter link.




 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   6 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.
Application Note


Packets Information




Each of the Packets results provides further detail when the user selects a particular
pass/fail parameter link, as follows:




 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   7 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.
Application Note

Burst Information




Each of the Burst results provides further detail when the user selects a particular
pass/fail parameter link, as follows:




 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   8 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.
Application Note

RTP Statistics Information
More detail for jitter is provided when the user selects that pass/fail parameter link, as
follows:




More detail for the jitter buffer is provided when the user selects that pass/fail parameter
link, as follows:




More detail for the delay is provided when the user selects that pass/fail parameter link,
as follows:




Test Data Management
The RTP Reflector measurement information can be saved to a task (work order) folder
for inclusion in installation quality assurance test data. This is done by selecting the
“save data” button on the initial results display.



 For Additional Help Contact
 Trilithic Applications Engineering                                                 860 DSPi RTP Reflector Option
 1-800-344-2412 or 317-895-3600                                                      P/N 0010275047 – Rev 10/08
 support@trilithic.com or                                                                                   9 of 9
 www.trilithic.com

                                Copyright © 2008 Trilithic, Inc. All Rights Reserved.

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860 dspi rtp_reflector_option_appnote

  • 1. Application Note 860 DSPi RTP Reflector Option Overview The 860 DSPi RTP Reflector Option extends the measurement and troubleshooting range of field technicians by offering a simple round-trip VoIP quality test from any RF test point. The option works through communication with the Tektronix DirectQuality active monitoring system, enabling tests to verify RTP communication from the test point to probes placed strategically throughout the cable network. Real-Time Transport Protocol (RTP) is used to transmit IPTV, Video-on-Demand (VoD), VoIP and other real-time media over IP networks. Tektronix’ RTP Loopback test agent accurately simulates these media streams by supporting over 50 different audio and video codecs, including the latest wideband VoIP, HDTV & IPTV standards. The RTP Reflector Option enables round-trip stream analysis for packet loss, jitter, delay and other IP impairments. R-factor, MOS and other industry-standard service quality metrics are included based on a Tektronix E-model implementation. The Tektronix DirectQuality server provides a PocketDQ 2.0 application that enables browser based activation of a wide range of tests to verify IP communication characteristics. For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 1 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.
  • 2. Application Note 860 DSPi Web Browser Configuration The links on the 860 DSPi browser homepage can be configured using WorkBench. The following procedure shows how to configure a link for “PocketDQ” or “RTP Reflector” on the 860 DSPi. The graphic shown to the right is the 860 DSPi Configuration Wizard Window within WorkBench that is used to set web browser parameters. To configure a link for “RTP Reflector”, perform the following steps; 1. Select the “Modify web browser parameters as defined below” radio button. 2. Choose the link title number that you wish to change, for example, “Link 3 Title” and enter “RTP Reflector”. 3. Choose the “Link 3 Address,” and change the URL to: http://[IP_address]/tektronix/cgi-bin/pocketdq.exe Note: For [IP_address] enter either the IP address of the DQ Server, or the name of the server, e.g. dq.trilithic.com, etc. For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 2 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.
  • 3. Application Note Accessing the PocketDQ Application After you have configured the 860 DSPi Web Browser using WorkBench, enter the 860 DSPi Web Browser mode and select the RTP Reflector link. The PocketDQ login screen will be displayed. Upon successful login, the following screen is displayed. This screen enables you to run a test, view previous test results, or retrieve support information. For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 3 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.
  • 4. Application Note Test Procedure When the user selects Test from the PocketDQ screen shown in the previous sections, the test will start with an initiation screen as shown below: First the user selects Test Objective, Test Origin (Call From), and Service Area. Next the user enters IP Address or Host Name for termination device. The IP address is set automatically when using a Trilithic 860 DSPi. The Test Duration can be set within a range of 1 to 10 minutes. The codec used is configured in the DirectQuality server default settings. For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 4 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.
  • 5. Application Note Searching for Previously Run Tests Tests that have been run previously can be found by “searching” and users can use any combination of parameters to search for test results. The search mode entry display example is shown below. Search results are grouped by date, as seen in the above results display. The “State” column provides overall Pass or Fail information. The “Phone/IP” column displays the phone number or IP address of termination. For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 5 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.
  • 6. Application Note The RTP Reflector top-level results display shows two results families: Speech Quality and RTP Statistics. Drilling down by selecting the pass/fail parameter provides the following information. The Speech Quality results include CQ (Conversational Quality) and LQ (Listening Quality) MOS and R-Factor. The RTP Statistics results include 5 additional results families, each with pass/fail limits. Each of these categories provides additional information accessible by selecting the pass/fail parameter link. For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 6 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.
  • 7. Application Note Packets Information Each of the Packets results provides further detail when the user selects a particular pass/fail parameter link, as follows: For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 7 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.
  • 8. Application Note Burst Information Each of the Burst results provides further detail when the user selects a particular pass/fail parameter link, as follows: For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 8 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.
  • 9. Application Note RTP Statistics Information More detail for jitter is provided when the user selects that pass/fail parameter link, as follows: More detail for the jitter buffer is provided when the user selects that pass/fail parameter link, as follows: More detail for the delay is provided when the user selects that pass/fail parameter link, as follows: Test Data Management The RTP Reflector measurement information can be saved to a task (work order) folder for inclusion in installation quality assurance test data. This is done by selecting the “save data” button on the initial results display. For Additional Help Contact Trilithic Applications Engineering 860 DSPi RTP Reflector Option 1-800-344-2412 or 317-895-3600 P/N 0010275047 – Rev 10/08 support@trilithic.com or 9 of 9 www.trilithic.com Copyright © 2008 Trilithic, Inc. All Rights Reserved.