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 two solutions for testing analog
2-wire interfaces, GL's VQuad™ w/ FXO Analog option and GL's VQuad™ with Landline adaptor.
GL's VQuad™ w/ FXO Analog option along with Voice Quality Testing (VQT) provides the complete automated network testing
solution including four analog 2-wire interfaces (RJ-11) and the voice quality measurement and analysis tools.
The analog ports may be connected to any US or European PSTN and, using the user-friendly 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 analog port may act independently (four different tests simultaneously) or the user may configure
two pairs of synchronized analog ports (improved handling of call control and sending/recording voice files). Each analog port may
be configured for Time Triggering, Digit Triggering, or Frequency Tone Triggering (thus easily synchronizing the analog ports with the
other VQuad™ interfaces such as Wireless or VoIP). 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 Landline Adapter provides a single analog 2-wire interface (up to four RJ-11 interfaces may be connected to a
single PC) with the necessary tools to automatically send/record voice files over an already established telephone call. Typical network
applications include VoIP systems, PSTN, ATM networks, Frame Relay, and Wireless Networks. Up to four landline adapters may be
connected to a single system, all utilizing the same VQuad™ application. Using the VQuad™ software, the user may configure automatic
generation and reception of voice files over an already established call. Using the landline adapter, the user can manually place an
analog call (telephone keypad included) or automatically answer an incoming analog call. Once the call is established, the user may
manually start the VQuad™ (or configure the VQuad™ to start automatically based on system time). The Universal Telephony Adapter
(UTA) (optional with this system) can be also used to provide a Round Trip Delay (RTD) measurement.
The GL VQT utilizes three widely accepted algorithms to perform the voice comparisons, the Perceptual Evaluation of Speech
Quality (PESQ LQ/LQO) per Rec. P.862/P862.1, the Perceptual Analysis / Measurement System (PAMS) per Rec. P.800, and the
Perceptual Speech Quality Measurement (PSQM) per Rec. P.861. PESQ provides an objective measurement of subjective listening
tests on telephony systems. PAMS predicts overall subjective listening quality (a human's perception of quality) without requiring
actual subjective testing (a very expensive and time-consuming process). PSQM predicts subjective quality of speech codecs without
requiring subjective testing. 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/ FXO Analog
- Four Analog Ports using industry standard RJ-11 connections.
- Manual or Automatic operation of traffic generation and full call control
- 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 real-time or post-processing
- Each analog port may be controlled independently for traffic and call control
VQuad™ with Landline Adapter
- Up to four landline adapters (RJ-11 interface) connected to a single system.
- Automatic send/receive of voice files over already established analog calls
- Auto-Answer Mode
- Time/Digit/Tone triggering of send/receive voice files.
- Optional addition of Universal Telephony Adapter (UTA) provides Round Trip Delay (RTD) measurements
- Compact and portable solution for testing mobile end-to-end voice quality
- Synchronized software for sending/recording of voice files
- Flexible architecture and features for recording locations, parameters, and time
- 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 real-time or post-processing
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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