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VQuad™ Probe - Self-contained Unit for
Voice, Video and Data Testing

VQuad™ Software Ver 8.3 | VQT Software Ver 6.6 | WebViewer™ Software Ver 5.0  | Download Now!


GL's VQuad™ Probe is an all-in-one self-contained node supporting multiple physical interfaces for connecting to practically any wired or wireless network while automatically performing voice and data testing. This comprehensive hardware device incorporates all the features of the current VQuad™ with Dual UTA unit such as portability and remote accessibility along with the necessary PC with Win7 OS. The Probe is designed for easier portability and convenient testing with all the capabilities of the current VQuad™ with Dual UTA solution.

The VQuad™ Probe is of same length as the current Dual UTA hardware, but about twice as high and 50% wider. For exact dimensions, refer to the specifications. The VQuad™ Probe supports two independent devices for connecting to endpoints of a single network or two completely separate networks. The VQuad™ Probe is configured for control via Ethernet using Remote Desktop (thus not requiring the Keyboard/Mouse).

With additional licensing (VQT274) VQuad™ probe can connect to Touchscreen Monitor. VQuad™ Probe unit can connect to a portable 10” monitor with touchscreen access via USB interface, which also includes virtual keyboard.

Following PC interfaces are embedded in the VQuad™ Probe:

  • 4 USB ports (can be used as Keyboard/Mouse ports as well as connecting a second Dual UTA or T1 E1 Analyzer)
  • 2 GBit Ethernet ports
  • Video port (VGA)
  • Serial port (COM)
  • In-built solid-state hard drive (32Gb)
  • In-built standard 2G memory

There are no moving parts with the VQuad™ Probe so reliability and longevity are integral.

VQuad™ Probe allows to test variety of networks, including Wireless (Bluetooth®, Wi-fi, 3G, 4G, LTE, PTT), VoIP, Analog, and TDM, practically allowing any end-point interfaces to be tested for voice, data, and video quality. Various associated applications (Voice Quality, Video Quality, Data tests, Echo and Delay tests, Fax tests, Voice Band Analysis) works with VQuad™ to provide "end-to-end assessment" with additional test and measuring capabilities. Different types of traffic supported includes - NB and HD Voice, Video, Tones, DTMF/MF Digits, Fax, and other Data (HTTTP, UDP, TCP, SMS, Email, DNS, Route, and FTP).

VQuad™ Probe Connections

Front Panel

Side: The VQuad™ Probe contains Side 1 and Side 2. These sides (devices) are completely independent of each other, so Mobile Phone Network Testing could be setup on Side 1 while FXO Network Testing could be configured on Side 2.

FXO Jack: The RJ-11 2-wire analog jack gives the VQuad™ Probe the ability to act as a telephone. This is a POTS interface that allows users to place calls, answer calls and utilize all of the probe’s voice quality and delay features.

In Jack:
 This 3.5 mm jack provides a balanced Audio In port. This jack can connect to a wide variety of the network interfacing equipment. Multiple impedance options are also available with this input.

Out Jack:
 This 3.5 mm jack provides a balanced Audio Out port. This jack can connect to a wide variety of the network interfacing equipment. Multiple impedance options are also available with this output.

Handset (HSET) Jack
: For use with handset-type phones. Connect the curly cord of the handset to this jack. This jack works in conjunction with the Handset (HSET) Base jack on the back of the VQuad™ Probe.

Monitor Jack:
 This 3.5 mm jack (stereo miniature phone type) provides for connection of a headset or amplified speakers to monitor the Audio In/Out signals on all interfaces.

Power LED:
 When illuminated indicates the VQuad™ Probe is receiving power and is ready to operate. The Probe is powered from the power jack.

USB Jack:
 Communications and power interface connection. Connect a second Dual UTA or T1E1 Analyzer or any USB device.

Back Panel

GPS (In): Input from external GPS receiver. The VQuad™ Probe uses location and time to provide additional information to the user. The one pulse-per-second GPS input will allow 1 ms accurate one-way and round-trip-delay measurements. Jack = RJ-45

GPS (Out): The VQuad™ Probe allows the GPS received data on the GPS (In) port to be transmitted out the GPS (Out) port. This enables a single GPS receiver to provide data to multiple Dual UTAs. Jack = RJ-45

Handset (HSET) Base:
 RJ-22 port that connects to a phone base on any telephone (POTS, VoIP, Digital) that contains a handset.

Bluetooth® (BT):
 TThe VQuad™ Probe has Bluetooth® built in, which allows users to connect to Bluetooth® enabled devices. This provides call control (control of phones calling/answering functions), the ability to send/record audio in/out of these devices as well as VoLTE testing supported using Bluetooth®.

USB Jack:
 Communications and power interface connection. Connect a second Dual UTA or T1/E1 Analyzer or any USB device.

LAN (1 & 2):
 2 GBit Ethernet ports used to connect the device to the LAN network using RJ-45 connectors.

Push-to-Talk (PTT):
 For use with radios that require activation of a push-to-talk function to transmit or receive audio signals. This RJ-45 jack is connected to the software-controlled relay internal to the VQuad™ Probe. When PTT is active (PTT LED on), pins 4 & 7 are shorted.

 Display VGA (Video Graphics Array) ports, used with VGA cable which connects to computer monitors or any display units.

 Serial COM Port, data transfer through serial ports connected the computer to devices such as terminals and various peripherals.

Hardware Specifications

3.5mm In/Out Jacks (Balanced Audio - Side 1 & 2), supports NB (8000 samples/s), WB (16000 samples/s) and SWB (48000 samples/s) Bluetooth Antennas - Side 1 & 2, supports NB (8000 samples/s) and WB (16000 samples/s)

Physical Dimensions:

Height: 3.0 in. (76.2 mm)
Width: 8.275 in. (210.18 mm)
Depth: 7.425 in. (188.59 mm)

Power requirements:

Input Voltage: +5VDC (derived from USB bus)
Current load: 200mA

External Connections:

USB 2.0: Type A USB Jack (Communication with Keyboard/Mouse/second Dual-UTA/ USB T1/E1 Analyzer)

3.5mm In/Out Jacks (Balanced Audio - Side 1 & 2)

  • Input Impedance – 600 ohms, 1000 ohms and User-Definable
  • Output Impedance - 600 ohms, 1000 ohms and User-Definable

RJ-11 Jacks (FXO - Side 1 & 2 ) 

RJ-22 Jacks (Handset/Handset Base - Side 1 & 2 )

3.5 mm (Monitor)

Dual RJ-45 Stacked Jacks (GPS In/Out and PTT - Side 1 & 2 )

  • PTT - Side 1 & 2 Input Impedance - 600 ohms, 1000 ohms and User-Definable
  • PTT - Side 1 & 2 Output Impedance - 600 ohms, 1000 ohms and User-Definable

Bluetooth Antennas - Side 1 & 2

Ethernet (2 GBit) ports – LAN1 & LAN2

Serial COM Port & Display VGA (Video Graphics Array) ports


CE, FCC, TBR21 compliant

Frequency Range Compliance:

FXO PCI card (VQT012)


Dual UTA FXO 2-wire interface (8K samples/sec)


Dual UTA FXO 2-wire WB interface (16K samples/sec)


Dual UTA Balanced, Mobile, PTT, Handset interfaces (8K samples/sec)


Dual UTA Balanced, Mobile, PTT, Handset WB interfaces (16K samples/sec)


Dual UTA Bluetooth interface (8K samples/sec)



Network Types

Automated Testing of Mobile Radio and Wireless Devices

4G LTE, VoLTE, 3G, 2G, WiFi, WiMax, Bluetooth™ ®

Wireless networks can impair voice quality by various means including poor mobile phone quality, voice/video compression and decompression algorithms, delay, loss or gain in speech levels, noise, acoustic and landline echo, and other distortions.

GL provides a compact and portable solution for testing Wireless and Mobile Radio devices for voice, video, and data quality using the GL VQuad™ application with the Dual UTA, or all-in-one VQuad™ Probe.

Some of the important features include:

  • Test mobile end-to-end voice, video, and data, quality measurement and analysis results
  • Mobile Phone call control – supports Bluetooth®,  2.5mm Audio Headset Jack interfaces, and 3.5mm terminations for Smartphones (iPhone, Android)
  • Support for voice quality testing on VoLTE network with AMR Wideband codec (with 16000 Sampling Rate) using Bluetooth® Wideband
  • Control Mobile Radios with Push-to-Talk functionality; Supports radio keying and send/record audio
  • Bluetooth® also performs RSSI, Battery level functions, and Network identity
  • Impair outgoing traffic using a noise file or user-defined white noise
  • All results along with call control information are sent to central database. Query results remotely using the WebViewer™.
  • Compatible with automated GPS location time-stamping

Some of these applications include

    • Voice Quality Testing (VQT) software for analysis according to widely accepted ITU (International Telecommunications Union) voice comparison algorithms (POLQA, PESQ LQ/LQO/WB)
    • Data Quality Testing (NetTest™)application for performing automated data testing on a wireless or wired network; tests include TCP, UDP, VoIP, Route, HTTP, FTP, DNS, SMS, Email, SIMInfo, Phone Info, and UEInfo
    • Video Quality Testing (VAC™) application for performing fully automated Video Conference testing and get Audio and Video MOS QoS results along with several analytical metrics
    • Echo Measurement Utility (EMU) for echo and delay measurements, including RTD, OWD, ERL, EPD, and more
    • Voice-band Analyzer (VBA) for monitoring voice band traffic (Speech Level, Activity Factor, RMS Factor, DC Level, Noise Level, Jitter, Echo Return Loss, Echo Delay, and Echo Dispersion)
    • Fax Quality Testing for emulation and analysis of T.30 faxes (GLInsight™ or FaxScan™)
    • Drive Testing solution for plotting all results and call control information along with co-ordinates using GPS receiver option in VQuad™, and Google Maps option within WebViewer™
    • WebViewer™ for web based controlling and monitoring VQuad™ nodes over the entire network 

Automated Testing of 2-Wire Analog interface (PSTN, ATA, Media Gateway)

GL's VQuad™ with Dual UTA provides the solution for testing analog 2-wire interfaces (PSTN, ATA, Media Gateway). The Dual UTA supports 2 Analog FXO interfaces (RJ11) and provides Off/On- Hook, DTMF Dialing, Flash Hook, Tone Detection (Dialtone, Ringback, Busy, Fast Busy, SIT) and CallerID. The Dual UTA Analog interface supports two-stage dialing, IVR testing, Voice Quality Testing, Delay Measurements, and Echo Measurements.

GL’s VQuad™ application can also work with vHandi™ - an handheld analog line tester to perform centralized voice quality measurements and analysis. GL’s vHandi™ is a compact portable hand-held FXO simulator (Foreign Exchange Office) that can simulate an analog phone. The vHandi™ call and voice tests can be completely automated or manually performed. Both solutions can be configured to automatically send/record a multitude of voice files and to perform VQT algorithms immediately after the voice file recording is complete.

  • Two Analog FXO ports per Dual UTA (RJ-11 interface).
  • Single FXO port per vHandi™ Handheld (RJ-11 interface)
  • Next generation Dual UTA HD includes support for FXO WB
  • Manual or Automatic operation of traffic generation and full call control
  • Each analog port may be controlled independently for traffic and call control
  • Supports all standard and customized call progress tones
  • Send/detect DTMF /MF digits, and tones of different frequencies (NB – up to 4 KHz, WB – up to 8KHz, SWB – up to 24 KHz)
  • Support for No Call Control (Quick Connect) on FXO interface 
  • Call control with Caller ID detection and display
  • Impair outgoing traffic using a noise file or user-defined white noise
  • Remote Access for starting/stopping the tests along with retrieving results.
  • All results along with call control information are sent to central database. Query results remotely using the WebViewer™.
  • Additional functionalities –

Automated Testing of VoIP (SIP) Interface, Digital VoIP Phones, VoIP Softphones

With the growing requirements for voice quality testing within VoIP networks, a major concern is testing the VoIP Network, VoIP phones, VoIP Softphones, and Analog Telephone Adaptors (ATA).

GL's VQuad™ with VoIP option, provides the ability to perform manual or automated tests on Softphones in the VoIP network.

The VQuad™ provides direct connection to the VoIP network with up to eight user agents per VQuad™ connected simultaneously. VQuad™ with Dual UTA provides the ability to test ATA’s while connected to the VoIP Network.


Automated Testing of TDM T1/E1 Interface (CAS/PRI ISDN) using T1/E1 Analyzer

Voice quality is essential for all networks as well as Gateways and Switches. The VQuad™ with TDM option includes the T1/E1 Analysis cards (PCI or PCIe) or Portable USB based T1 E1 Analyzer units for a truly portable solution.  This system provides the mechanism for signal and voice quality testing over T1/E1 trunks.

Using the T1/E1 Analyzer, the VQuad™ can generate and receive up to 12 simultaneous CAS or PRI ISDN or No Call Control (NOCC) calls on T1 or E1 trunks. Once the call is up, send/record voice via the VQuad™ to get VQT MOS results.

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.

  • Supports Call Control for PRI ISDN and CAS Protocols
  • Also supports No Call Control (NOCC), where the T1/E1 call is connected without any call control required.
  • Send/detect DTMF /MF digits, and tones of different frequencies (NB – up to 4 KHz, WB – up to 8KHz, SWB – up to 24 KHz)
  • Supports up to 12 simultaneous T1/E1 channels using VQuad™ interface
  • Impair outgoing traffic using a noise file or user-defined white noise
  • Additional functionalities –

Test Types

Delay Measurements

OWD - End points at same location

OWD - End points at separate location

  • Round Trip Delay (RTD) 
  • One Way Delay (OWD) 
  • Post Dial Delay (PDD)
  • Signal-to-Noise Ratio (SNR = S/N)
  • Oscilloscope and Spectral Display
  • RMS Power as well as C-Message 
  • Supports a new Correlator method for providing extremely accurate delay measurements.
  • Audio analysis feature within VQuad provides overall Frequency Bandwidth and Power associated with the voice file.

Echo Measurements

Echo Identification

Acoustic Echo Canceller Testing

  • Supports echo measurements over any network using EMU
  • Assess sidetone, line, and acoustic echo and the corresponding delays.

Voice Band Analysis

  • Monitor voice band traffic
  • Measure Active Speech Level, Activity Factor, RMS Factor, DC Level, Noise Level, Echo Return Loss, Echo Delay, and Echo Dispersion statistics.

Automated Voice Quality Testing

End points at same location

End points at different location

  • Network-independent VQT – Supports legacy, as well as Next Generation networks
  • POLQA (ITU-T P.863)
  • PESQ (ITU-T P.862), PESQ LQ, LQO (P.862.1), PESQ WB (P.862.2)
  • PAMS (ITU-T P.800)
  • PSQM/PSQM+ (ITU-T P.861)
  • Call control analysis (Failed Calls, Dropped Calls, and Call ID)
  • Monitoring IVR System for voice and data quality
  • Supports PESQ/POLQA (both NB and WB) measurements
  • Supports Narrow band and Wideband audio (both 8k and 16k samples/sec) 
  • Auto detects voice files with wideband attributes
  • All VoIP Codec supported including - G.711, G.711 App II with VAD, G.729, G.726, G.726 with VAD, GSM, AMR NB and WB, EVRC, SMV, iLBC, SPEEX NB and WB, G.722, and G722.1.
  • Visit Voice Codecs webpage for more comprehensive information.

Automated Data Quality Testing

VQuad™ is enhanced to support Data Testing including TCP, UDP, VoIP, Route, HTTP, FTP, DNS, SMS, Email, PhoneInfo, SimInfo, and UEInfo. The Data Tests are configured via the VQuad™ scripting and supports Wireless devices as well as PC Ethernet connections (wired, WiFi, Broadband 3G/4G, and LTE).

  • Network independent, supports 4G LTE, 3G, WiMax, and Wired Internet connections
  • Supports Mobile devices (i.e. iPhone, Android)
  • Supports PC Ethernet connection (Wired, Wi-Fi, Broadband (3G or 4G))
  • Different type of tests supported – TCP, UDP, HTTP, FTP, DNS, VoIP, Route, SMS, Email, PhoneInfo, SimInfo, and UEInfo.
  • End-to-End SMS Testing over wireless network directly and remotely
  • Remotely perform Data tests from GLNetTestApp on mobile devices (iPhone, Android); this requires connection with Mobile Device Controller server. Mobile device communicates with Mobile Device Controller from anywhere in the world.
  • Fully automated and remote testing with all results accessible via WebViewer™.

Automated Video Quality Testing

VQuad™ can now initiate, control, test, and measure video conferencing services over IP, and Wireless networks, using additional support of a Video Controller/Server and Video Clients (Agents).
Video Tests can be configured between any two active video clients with flexibility of specifying the typical characteristics of the Video test.   Video Test agents generates simulated video calls to other test agents as per these test parameters.

  • Fully automated Video Conference testing performed with QoS results provided along with several analytical metrics
  • Support for Android, PC and Linux based video clients (end points) for active Video Quality Testing
  • Both manual and automated tests are supported
  • Tests can be run directly from the Android phone or using the VQuad™ interface
  • Configure unlimited test plans; video test parameters include Codec, Bandwidth, Latency, Frame Rate, GoP (Group of Pictures) Structure, Echo, and Resolution
  • Test results include Video MOS, Audio MOS, and A/V MOS along with a variety of analytical and quality metrics
  • Fully automated and remote testing with all results accessible via WebViewer™.

Drive Testing for Wireless Networks

  • Drive test with any Wireless device with real-time GPS mapping
  • GPS connectivity for recording timing and location of tests performed
  • The GPS mapping records and adds the real-time GPS information to all test results and VQuad™ call control.
  • GPS Location includes stamping each result with Latitude, Longitude, and GPS Time Stamp
  • The Indoor Tracking System (ITS) in VQuad™ is developed to support VQT in remote locations where GPS signal is unavailable
  • The ITS information (location, timestamp) is saved to the database per VQuad™ Measurement
  • GPS information is automatically sent to central database and accessed via Google Maps feature in WebViewer™.

Automated Fax Quality Testing

  • Supports Fax testing (sending and receiving) up to 4 independent and simultaneous T.30 faxes over 2-Wire, and 4-wire analog networks
  • Support higher resolution and multi-page fax TIF files
  • Tx and Rx fax rate from 2400 baud to 33600 baud with V.34 fully supported.
  • Interfaces supported for fax generation include 2-wire FXO and 4-wire analog.
  • Automatically save the fax session (both East and West directions) to a PCM file.
  • Supports higher resolution and multi-page fax TIF files.
  • Use GLInsight™ or GL Fax Scan analysis software packages for further analysis of the recorded fax files. GL's FaxScan™ can be configured for fully automated analysis.

Automated IVR Testing

  • Simulate IVR Users and IVR System
  • Single-box portable solution and Rackmount PC solution for higher density
  • Complete automation with enhanced scripting and remote operation including traffic generation and call control scripting
  • Automate the IVR testing process - call establishment and traffic generation detection process through scripts
  • Monitoring IVR System for voice and data quality
  • Perform Quality of Service (PESQ) or path confirmation tests
  • Within a proper voice call, additional analysis is available such as Round Trip Delay (RTD) and Voice Quality Testing (VQT)
  • Support for Command Line Interface (CLI) to access VQuad™ remotely

Buyer's Guide

Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.

Item No. Description
VQT280 VQuad™ Probe HD (with Dual UTA HD)
VQT281 VQuad™ Probe HD w/o Dual UTA HD
VQT285 VQuad™ Probe HD Upgrade
VQT274 VQuad™ Probe Touchscreen Monitor
  Related Hardware
VQT251 Dual UTA HD Next generation Dual UTA with FXO Wideband support
VQT252 Dual UTA HD – Bluetooth Option
Item No. VQuad™ Network Options
VQT010 VQuad™ Software (Stand Alone)
VQT013 VQuad™ with SIP (VoIP) Call Control
VQT015 VQuad™ with T1 E1 Call Control
Item No. VQuad™ Miscellaneous
VQT030 Network Command Center (Multi-Node Command and Control Center for VQuad™ Systems)
VQT601 Mobile Device Controller (MDC) Software
VQuad™ Fax Emulation (2 simultaneous ports)
VQuad™ Fax Emulation (8 simultaneous ports)

Video Application Controller (VAC)
(includes VAC Server and VAC companion software)

VAC Windows/Linux Agent, single license, 5Mbps
VAC Windows/Linux Agent, single license, 10Mbps
VAC Windows/Linux Agent, single license, 50Mbps
VAC Android Agent, single license, 5Mbps
VQT442 (cable) Mobile Audio Interface for Smartphones
VQT443 (cable) 3-wire headset interface Adaptor for Smartphones
Item No. VQT Analysis
VQT002 Voice Quality Testing (PESQ only)
VQT006 VQT w/ POLQA Server License
VBA032 Near Real-time Voice-band Analyzer
EMU037 Echo Measurement Utility (EMU) Software
VQT040 Webviewer™


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