GL's VQT WebViewer™ facilitates a voice quality test result display using a simple web browser. The results are
accessed from database that stores real-time and historic data.
GL’s VQuad™ is used to transmit/capture the voice files in real-time from various network nodes. The degraded and the
reference files are then automatically transferred to GL's VQT, which analyzes the voice files and generates the appropriate
PESQ MOS. Additional analytical metrics are also provided as a result of the VQT algorithm including jitter, clipping, and level
measurements.
Click the image to view Live Demo of VQT
WebViewer™  |
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This is a live demo of GL's VQT WebViewer™ system. Using this demo, you can watch (in real-time) the quality of voice
files being probed and captured from various network nodes.
Lab System Setup
Components of GL's WebViewer™ Demo System
GL's WebViewer™ demo system has a four tier architecture. The first layer consists of GL's VQuad™ which establishes
the proper calls between the near and far end using a variety of physical interfaces. The File Transfer Utility (FTU) transfers
the degraded (recorded) voice files from the individual VQuad™ nodes to one of several VQT systems which are located on
the second layer. Each VQT automatically analyzes the degraded voice file and transmits the analytical results to a single
central VQT database located at the Data Layer. This third layer provides a means for storing the captured results. The last
layer is the Data Access Layer (Application Server) where the data presentation logic is contained. Each of these
components is briefly explained below.
VQuad™ - VQT
The VQuad™ with Dual UTA provides an active single box QoS solution for sending/recording voice over a variety of network interfaces
in an automated and synchronized manner. Using the GL VQT, analysis of the recorded voice files can automatically be
executed with the results being transmitted to the VQT central databse. The VQT utilizes the algorithms
ITU-P.862.1/862.2 PESQ LQ/LQO/WB along with ITU-P.800 PAMS and ITU-P.861 PSQM. In addition to sending/recording
voice, the VQuad™ also supports automated call control for establishing calls and verifying the call is up prior to
sending/recording voice.
The VQT application can perform Auto Measurement on the remote location (based on IP address) with the
cooperation of the File Transfer Utility function. File Transfer Utility is utilized to transfer the .pcm voice files from one or
more remote locations.
For more details on interface characteristics visit VQuad™ and
VQT web pages
Data Layer
An Oracle or MS Access database (user specified) is used to store the analytical measurement results along with all
pertinent data associated with the VQuad™/VQT testing (timestamps, Call ID, location information). This provides a very
flexible and expandable architecture for data storage and data access. The database is accessed in real-time over the
web using an application server or queried by customer applications.
A listener application is co-hosted with the database server running on the Data Layer. It collects the data posted by
the probes and then updates the database using the collected data
Application Server
The WebViewer™ provides an application server for accessing the PESQ LQ/LQO/WB MOS measurements along with
the additional analytical measurements including Call ID information. The results are queried over the internet using any
browser-capable device such as desktops, table PCs or PDAs. The application server is capable of serving the data in
real-time or providing historic data based on customer selected filters.
Using the Application Server
Using any browser-capable-device, you can access the VQT Analytical Results from anywhere in the world. When
you point your browser to the Application Server URL, the following page will be displayed.
Latest Records
Select the Latest Records tab from the main screen of the WebViewer™ in order to query the VQT database based
on the last records entered into the VQT central database. Using this option, automatic refresh is available as discussed
below. Click the Search button in order to perform the query.
Search last records
Users can customize the required number of records to be viewed per query and per page. Less number of records
per query will result in faster system response.
Timestamp
Measurement results can be filtered based on the available timestamps - Call Timestamp, VQuad™ Timestamp,
DCOSS Timestamp, and VQT Timestamp.
Auto refresh
The Auto Refresh option is available only if ‘Search Last’ is configured for 100 records. Choose the Refresh time in
seconds and the system will continuously refresh until the browser is closed or the ‘No Refresh’ option is selected or
the user navigates to another page.
Date/ Time
Select the Date / Time tab from the main screen of the WebViewer™ in order to query the VQT database based on
user defined Date and Time selections. Using this option, automatic refresh is not available.
Date/Time selection
Specify the Start Date/Time and the End Date/Time. Keep in mind that the End Date/Time should be after the Start
Date/Time. The WebViewer™ will query the VQT central database based on the user-specified time period. Click the
Search button in order to perform the query.
Search Criteria
Using the Search Criteria option, the user may filter the search based on a variety of different criteria. Specify the
Criteria along with the user-defined value and either And or Or this criteria within the Search table. Thus, a simple
search filter or a rather complex search filter may be created. The user may Save/Load the Search Criteria, thus making
it available for the next WebViewer™ query.
Output Configuration
Output results can be filtered further based on the number of records per query, per page, or based on
measurement values.
Column Setup
Users can select all or any required column from the available list of parameters to be displayed in the VQT results
data view.
Click here to see the live demo
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