GL's VQT provides a widely accepted solution for assessing voice quality in the telecom industry. Voice Quality Testing across multiple networks (T1, E1, T3, E3, OC-3, OC-12, VoIP, Wireless, and Landline) is available.
Gaithersburg, Maryland (PRWEB) June 21, 2012
GL Communications Inc. a leader in providing PC-based test, analysis and simulation products and consulting services to the worldwide telecommunications industry, conveyed today the availability of Voice Quality Testing (VQT) software.
Speaking to the press, Mr. Robert Bichefsky Senior Manager of the company said, “GL’s Voice Quality Test Tools provide facility to test voice quality with common platform and common software that helps avoid purchasing dedicated software and equipment for various technologies. The test tools provide the means of sending and receiving speech signals through various network interfaces.
GL’s VQT (Voice Quality Testing) software then rates the transmissions using ITU standard algorithms PESQ and PSQM. Mean Opinion Score (MOS), speech level, noise level, echo, and other distortions common to voice transmissions are measured and provided automatically, remotely, and repetitively as required by the end user. Typical network applications include VoIP systems, PSTN, ATM networks, Frame Relay, and Wireless Networks.”
He added, “The GL 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/P.862.1, the Perceptual Analysis / Measurement System (PAMS) per Rec. P.800, and the Perceptual Speech Quality Measurement (PSQM) per Rec. P.861.
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 LQ/LQO/WB and PSQM (+) simultaneously, using two voice files (Reference File and Degraded File) and provides the algorithm results in both a graphical and tabular format.”
Mr.Bichefsky further added, “The GL VQT provides a user-friendly interface, which allows the user to perform manual voice quality assessments by simply entering a Reference File and a Degraded File. The results of the VQT algorithms, PESQ LQ/LQO/WB, PAMS and PSQM, are displayed both in tabular format as well as graphically. Additional analytical results are displayed as part of the assessment such as jitter, clipping, noise level, and delay (end to end as well as per speech utterance).
The user may configure a Rating Criteria for all VQT algorithms as well as the additional analytical results. The rating criteria may be configured for Excellent, Good, Fair, and Poor.
The GL VQT may also be executed in Auto Mode that automatically performs the voice quality algorithms and displays the results.”
Important Features
·Manual or Automatic operation using GL's VQuad™, DCOSS, APS, PacketGen™, or T1/E1 Analysis Cards
·Testing the Voice Quality of Telecom Networks as well as ATM and PSTN Connections.
·Measuring the effect of Packet Jitter in VoIP Network.
·Measuring Voice Performance over Frame Relay Networks.
·Analyze the Effects of Codec Compression in Wireless Networks.
·Supports PESQ ITU-P.862.2 for Wideband
·Provides PESQ LQ/LQO/WB results along with Active Speech and Noise Levels, Latency, Jitter, Clipping, and Power Measurements.
·Provides PAMS and PSQM (+) Mean Opinion Score (MOS) results.
·Tabular as well as Graphical Results.
·Automatic Mode allows the GL VQT to execute on a network system and point to a user-defined network drive.
·Complete automatic logging of all results (both file and database) with the ability to import log back into VQT.
·Query results remotely using the VQT WebViewer™. All VQuad™ call data is also sent to the VQT database for cross analysis.
·Real-time mapping (most countries supported) of results when optional GPS is used in conjunction with VQuad™.
·Sophisticated search features on the results within the VQT application
About GL Communications Inc.,
Founded in 1986, GL Communications Inc. is a leading supplier of test, monitoring, and analysis equipment for TDM, Wireless, IP and VoIP networks. Unlike conventional test equipment, GL's test platforms provide visualization, capture, storage, and convenient features like portability, remotability, and scripting.
GL’s TDM Analysis & Emulation line of products includes T1, E1, T3, E3, OC-3, OC-12, STM-1, STM-4, analog four-wire, and analog two-wire interface cards, external portable pods, and complete system solutions. Capabilities include voiceband traffic analysis and emulation across all traffic types (voice, digits, tones, fax, modem), all protocols (ISDN, SS7, GR-303, Frame Relay, HDLC, V5.X, ATM, GSM, GPRS, LTE, etc.), and with capacities up to thousands of channels. Our newest products provide astonishing capacity and capture capability up to and including gigabit speeds.
GL’s VoIP and IP products generate / analyze thousands of calls and traffic simultaneously with traffic types such as frames, packets, voice files, digits, video, tones, noise, and fax. Almost all codecs are supported including G.711, G.729, AMR, EVRC-A, B, C, GSM, iSAC, and many more. Additional features include visual analysis, real-time listening, and recording. The product line also includes Ethernet / IP Testing capability that simulates and checks frame transport and throughput parameters of Ethernet and IP networks, including delay, errors and other impairments.
GL's Voice Quality Testing (VQT) product line complements all of GL's products. Using ITU-standard algorithms (PAMS, PSQM, and PESQ), GL's VQT provides a widely accepted solution for assessing voice quality in the telecom industry. Voice Quality Testing across multiple networks (T1, E1, T3, E3, OC-3, OC-12, VoIP, Wireless, and Landline) is available.
GL’s Wireless Products perform protocol analysis and voice quality assessment on GSM, CDMA, UMTS, and LTE networks. Connections can be made to any wireless phone with automated call control, GPS mapping and real-time signal measurements.
GL’s Echo Canceller testing solutions provide the broadest range of simulation and analysis, including line and acoustic echo. GL’s compliance testing per G.168. G.167 and P.340 across TDM, IP, VoIP and Wireless networks is widely accepted in the industry.
GL’s wireless VQT solutions help assessing impairments to voice quality such as poor mobile phone quality, voice compression and decompression algorithms, delay, loss and gain in speech levels, noise, acoustic and landline echo, and other distortions are easily assessed and accurately measured.
GL’s Handheld data testers can test a wide variety of communications facilities and equipment including T1, fractional T1, E1, fractional E1, T3 and E3 modems, multiplexers, CSU, DSUs, T1 CSUs, DTUs, NTUs and TIUs and more. The testers provide convenience, economy, and portability for almost any interface, including RS232, RS-422, RS-530, X.21, T1, E1, T3, E3, and many others.
GL’s Network Surveillance and Monitoring products include Probes for TDM, IP, VoIP, ATM, and Wireless networks. An open standards based approach provides a scalable, feature rich, real-time access to network characteristics. Centralized or distributed access, efficient transport and database loading allow compatibility with 3rd party and standards based monitoring systems.
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