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Agilent Voice Quality Tester
 
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Overview.
The Agilent Voice Quality Tester (VQT) is a comprehensive and objective voice quality test system that provides detailed test and analysis capabilities for voice quality on both legacy and modern telephony networks, including VoIP, VoATM, and hybrid circuit/packet networks. VQT is available as both specialised hardware and also as the J5479A software version, which allows active voice quality testing over a standard ethernet NIC card
The VQT enables the design, deployment, and operation of voice services on Next Generation Networks by providing accurate and objective testing of voice quality. It provides robust and reliable measurements that go beyond giving test scores. The VQT provides detailed scoring analysis that exposes the impairments to voice quality.
By including testing for voice clarity, delay, echo, silence suppression, DTMF, and signal loss, all on one box, the VQT provides a total solution for testing voice quality on next generation networks.
The VQT supports analog, T1, E1, and Ethernet interfaces to enable testing at different access points for network segmentation and fault isolation. Using different signaling types, including FXO, E&M, CAS, ISDN, SIP, and H.323, the VQT enables testing across any telephony network.
Main Applications.
The VQT is at work today assisting engineers and technicians at leading global communications companies.
- Qualify network deployments for voice services
- Perform pre-VoIP network assessments
- Baseline network performance under varying conditions
- Optimize systems and networks for voice quality
- Monitor network for voice quality impairments
- Troubleshoot voice quality impairments
- Assess network performance against competitor networks and the PSTN
- Test new prodcuts and designs for voice quality
- DELIVER TOLL QUALITY!
The VQT addresses the key challenges of deploying voice services on IP telephony networks:
- Delivering Toll Quality Voice
- Maintaining voice clarity among many VoIP impairments
- Minimizing end-to-end delay, to less than 120 msec
- Detecting and minimizing the effects of echo
- Troubleshooting voice quality problems in complex hybrid networks
- Transmitting DTMF tones across VoIP networks
- Balancing voice quality with network efficiency mechanisms, such as silence suppression and voice compression
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Technical Features.
- Speech quality measurements and analysis using PESQ (ITU P.862), PSQM+ (ITU P.861), and PAMS
- Voice delay measurement and troubleshooting
- Echo measurement and analysis
- Silence suppression analysis including VAD front-end clipping and hold-over time
- Signal loss measurement using noise, tones, and voice
- DTMF tone distortion measurement and analysis
- One-click testing on every measurement
- Testing with over 150 voice samples in nine different languages
- Remote control of distributed test servers
- Network simulation and echo generation
- Tone, noise, and voice sample generation and recording
- Easy to use - begin testing right out-of-the-box and get results within minutes
- Detailed test configuration and analysis for troubleshooting
- Automated Task Lists come pre-configured and easy to modify and create. No programming or scripting is required.
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Supported Interfaces.
The Agilent Voice Quality Tester (VQT) offers a complete set of telephony interfaces to enable testing at different access points and across any telephony network.
Analog FXO and E&M (2-wire and 4-wire)
- Test voice quality into POTS lines, Cable Modem MTAs, DSL IADs, FXS VoIP
- Access Routers, Residential Gateways. Easy to setup and get started!
- Test voice quality characteristics of analog-access end users
T1 and E1
- Multiple Simultaneous Call Generation and Traffic Loading on All Channels
- Test voice quality directly into a T1/E1 access network. Test at different access points and across different types of networks
- Fully load dual-port T1 or E1 interface and measure performance of network under various traffic conditions
Ethernet VoIP Interface - NEW
- Enables voice quality testing over SIP and H.323 calls
- Connect VQT directly into IP network - isolate and troubleshoot voice quality impairments by segmenting the call path
- Assess voice quality performance of pre-VoIP networks
IP phone / PC phone adapter
- VQT interfaces to IP phones and PC soundcards
- Test voice quality across IP phones and PC softphones
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Product Variants.
The VQT is available in different product formats to meet the various requirements of installation testing, troubleshooting in the field and in-service monitoring.
VQT Portable Analyzer
- The VQT Portable Analyzer is a rugged, portable, self-contained unit.
- Ideal for field service and dispatched applications.
VQT Network Server
- VQT Network Server is a rackmountable test server
- Ideal for network installations and lab testing.
J5479A VQT Software
VQT Responder
- VQT Responder is a small, low-cost brick for remote use
- It enables affordable, large-scale deployments of the VQT solution.
All VQT platforms are remotely controllable! |
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