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Press Release : GL Releases 2-Wire Voice/Data Capture and Analysis System

Gaithersburg, Maryland, USA - May 20, 2009 - GL Communications Inc., announced today the release of 2-Wire Voice/Data Capture and Analysis system. Addressing the media men gathered, Mr. John Phipps, Senior Engineer at GL said, "The GL's Voice/Data Software and Hardware is used to manually capture voice or data over 2-wire Analog lines. Using the Dual UTA, USB T1 E1 Analyzer, or a sound device, one can non-intrusively 'tap' into the analog 2-wire line and capture the bi-directional voice or data signal to a single PCM file".

Mr Phipps added, "The Dual UTA or USB T1 E1 Analyzer provide very accurate capture of the signal suitable for Fax and Modem demodulation, whereas an external sound device is adequate for voice signals".

Important Applications:

  • Modem and Fax Data Analysis:

    GLInsight™ analyzes fax and modem calls recorded on 2-wire or 4-wire circuits, including PSTN or IP networks.

  • VQuad™ for PDD (Post Dial Delay) & PRD (Post Ringback Delay) Measurements:

    Recorded voice files can be analyzed for Post Dial Delay (PDD). PDD analysis is done by detecting the trailing edge of the last DTMF digit sent to the leading edge of the Ringback tone received from the far end. Similarly, Post Ringback Delay (PRD) measurement is done by detecting the end of the Ringback signal to the beginning of a voice signal (i.e. the beginning of the call).

  • Voice Band Analyzer:

    The Near Real-time Voice-Band Analyzer (VBA) is an analysis tool for voice band traffic over VoIP, TDM and wireless networks. It can host an arbitrary number of analysis algorithms. Built-in algorithms include ITU-T P.56 Active Voice Level analysis, Line Echo (Hybrid) analysis, and Acoustic Echo analysis. Other analysis modules such as ITU-T P.561, P.562, and P.563 can be hosted as plug-ins".

For comprehensive information on the product, please refer to 2-Wire Voice/Data Capture web page.

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, STM-1, 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, etc.), and with capacities up to thousands of channels.

GL's VoIP products generate / analyze thousands of calls simultaneously with traffic types such as voice files, digits, video, tones, noise, and fax using G.711, G.729, AMR, EVRC, GSM and a range of other codecs. Additional features include visual analysis, real-time listening, and recording. The product line also includes a Software Ethernet Testing capability that checks frame transport and throughput parameters of Ethernet and IP networks.

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 excepted solution across the telecom industry. Voice Quality Testing across multiple networks (T1, E1, T3, E3, OC-3, VoIP, Wireless, and Landline) are all available.

GL's Wireless Products perform protocol analysis and voice quality assessment on GSM, CDMA and UMTS 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 compliance testing per G.168 and G.160 across TDM, IP, VoIP and Wireless networks. GL's wirelss 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 intelligence. Centralized or distributed access, efficient transport and database loading allow compatibility with 3rd party and standards based monitoring systems.

For more information about GL's complete line of products,


Shelley Sharma
Phone: 301-670-4784 ext. 114

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