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

• Portable USB T1E1 Analyzer
  
  
• VQT Software
  
  
• VQuad™ (Formerly AFT)
  
  
• Testing Analog Telephone Adapters (ATAs)
  
  
• Automated Wireless Drive Testing
  
  
• Active and Passive Voice Quality Testing
  
  
• Intrusive Network Voice Quality Testing

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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

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Screenshots

• VQuad™ Device Settings
  
  
• VQuad™ T1/E1 Settings
  
  
• VQT Main Screen
  
  
• PESQ Analysis Window
  
  
• VQT Measurement Results
  
  
• VQT Cumulative Statistics
  
  
• VQT Auto Measurement Window
  
  
• VQT Rating Criteria Window

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Buyer's Guide:

Item No.	VQuad™ Network Options
VQT010	VQuad™ Software (Stand Alone)
VQT020	VQuad™ Wireless Phone Call Control
VQT012	VQuad™ Analog FXO 4-port Call Control
VQT013	VQuad™ with SIP (VoIP) Call Control
VQT015	VQuad™ with T1 E1 Call Control
Item No.	VQuad™ Miscellaneous
VQT202	VQuad™ GPS Location and Timing Option (per node - including GPS receiver)
VQT030	Network Command Center (Multi-Node Command and Control Center for VQuad™ Systems)
VQT240	Universal Telephony Adapter (UTA) with Round Trip Delay Measurement
VQT250	High Quality USB Audio Capture Unit
VQT300	Portable Wireless Enclosure Kit
Item No.	VQT
VQT002	Voice Quality Testing (PESQ only)
VQT004	Voice Quality Testing (PAMS, PSQM, PESQ)
VBA032	Near Real-time Voice-band Analyzer

* Specifications are subject to change without notice.