The VQuad™ with TDM option provides the ability to perform manual or automated tests on the T1/E1 networks. The
GL VQuad™ software combined with GL's Voice Quality Testing (VQT) software permits this desired VQT testing, yielding
results that include PESQ (LQ/LQO/WB)/PAMS/PSQM+ Mean Opinion Scores (MOS). These results provide an excellent
overall measure of voice quality of the equipment under test.
Using GL’s portable T1/E1 Analyzer units or HD T1/E1 cards, VQuad™ can generate and receive up to 8 simultaneous
CAS, PRI ISDN, or No Call Control (NOCC) calls on either T1 or E1 trunks. The T1/E1 option includes a script based CAS
State Machine for creating any desired CAS protocol. Included with the PRI ISDN are all variants associated with ANSI
and ETSI specifications.
The GL’s VQT utilizes three widely accepted algorithms to perform the voice comparisons, the Perceptual Evaluation
of Speech Quality (PESQ LQ/LQO/WB’) per Rec. P.862.1/P862.2, 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 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
- Connect at endpoint of a TDM network
- Up to eight instances connected to a single system
- Automatic call control (CAS, PRI ISDN, or No Call Control (NOCC)
- Automatic send/receive of voice files over already established calls
- Time/Digit/Tone triggering of send/receive voice files.
- Compact and portable solution for testing end-to-end voice quality
- Synchronized software for sending/recording of voice files at multiple locations
- 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
Screenshots
Buyer's Guide:
* Specifications are subject to change without notice.