Overview |
Main Features |
Buyer's Guide
Overview
Assuring uninterrupted high quality voice within a network is critical irrespective of what type of network is carrying the voice. Testing these networks
can become cumbersome, time consuming and quite costly. GL provides the solution for testing analog 2-wire interfaces using GL's
VQuad™ with either the Dual UTA or the FXO 4-port Analog hardware.
Both hardware options provide the complete automated network testing solution. This includes up to four analog 2-wire interfaces (RJ-11) and,
when coupled with the GL VQT, provides the necessary voice quality measurement and analysis tools.
The analog ports may be connected to any US or European PSTN and, using the user-friendly VQuad™ GUI, the
user can place calls to any desirable number as well as answer incoming calls in a manual or automated manner. The product can be configured manually
to send and record voice files or configured to automatically send/record a multitude of voice files to be used in the VQT algorithms. While in automode,
the GL VQT may be configured to automatically perform the VQT algorithms immediately after the recorded voice file is complete. Each analog port may
act independently (up to four different tests simultaneously) or the user may configure multiple pairs of synchronized analog ports (improved handling
of call control and sending/recording voice files). In addition, the VQuad™ can send and detect DTMF digits while the
call is established. This allows two-stage dialing as well as path confirmation.
The VQuad™ with Dual UTA also adds the functionality for Round Trip Delay and
One Way Delay measurements. The Dual UTA also support Echo measurements, multiple tone detection (including busy,
fast busy, SIT), Caller ID detection and display, and Flash Hook. The Dual UTA FXO is fully user configurable and allows
most any type of connection and multiple stage dialing (including immediate connect for PBX systems). Click here for
more details on Dual UTA.
The GL VQT utilizes three widely accepted algorithms to perform the voice comparisons, the Perceptual Evaluation of Speech Quality
(PESQ LQ/LQO/WB) per Rec. P.862/P862.1/2, the Perceptual Analysis / Measurement System (PAMS) per Rec. P.800, and the Perceptual Speech
Quality Measurement (PSQM) per Rec. P.861. PESQ is most widely used and provides the necessary MOS based on both standard 8000 sample files
as well as WideBand 16,000 sample files. The PESQ algorithm also provides additional analysis including jitter, levels, clipping, and per utterance
measurements. The GL VQT performs PESQ, PAMS, and PSQM (+) simultaneously, using two voice files (Reference File and Degraded File) and provides
the algorithm results along with analytical results in both a graphical and tabular format.
Additional Information
Main Features:
VQuad™ w/ Dual UTA
- Multiple Analog ports using industry standard RJ-11 connections.
- Manual or Automatic operation of traffic generation and full call control
- Round Trip Delay and One Way Delay measurements
- Echo Measurements
- Detect user-defined Dial Tone, Ring Back, Busy, Fast Busy, SIT.
- Send Digits during established call for two-stage dialing and IVR menu systems
- Caller ID
- Both USA and European standards supported (FCC and TBR-21 certified)
- Remote Access for starting/stopping the tests along with retrieving results.
- GL VQT Automatic Mode allows automatic execution of the VQT algorithms (PESQ, PAMS, PSQM+).
- Additional measurements include Clipping, Jitter, Latency, Noise and Signal Levels.
- Results available in post-processing
- Each analog port may be controlled independently for traffic and call control
Screen Shot of VQuad™ Main Window
Screen Shot of VQuad™ Manual Call Generation
Screen Shot of VQT Waveform/Spectral Viewer
Screen Shot of VQT PESQ Measurement Window
Screen Shot of VQT Measurement Results
Screen Shot of VQT Cumulative Statistics
Buyer's Guide:
* Specifications are subject to change without notice.
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