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Press Release: GL Announces Real-Time
Multi-Channel Audio Bridge

Gaithersburg, Maryland, USA - April 19, 2010 - GL Communications Inc., announced today the release of its latest product Real-Time Multi-Channel Audio Bridge software. Briefing the media, Mr. Jagdish Vadalia, Senior Manager of Development, said, ďThe ability to send/receive from a sound card directly to T1 E1 timeslots is available once again for the latest HD cards, USB units and Universal Analyzers. The application allows one to listen to T1 E1 timeslots directly on a PC speaker or insert Microphone or Line In signals into T1 E1 timeslotsĒ. He added, ďThat's not all! This powerful optional application can also interwork with other "sound card aware" applications like Goldwave, Cool Edit, Adobe Audition, Audacity, Matlab, LabView and many others. In this case, third party "virtual sound card" software is required, e.g. VAC (Virtual Audio Cable)Ē.

Mr. Vadalia, further added, ďReal-Time Multi-Channel Audio Bridge is an application that provides a bridge between T1 E1 timeslots and single or multichannel sound card(s). In addition, as shown in the diagram below, linear PCM can be converted to G.726 (40 kbps, 32 kbps, 24 kbps, or 16 kbps) for direct insertion into T1 E1 timeslots, instead of the usual u-law or A-lawĒ.

Main Features

  • Insert speech on T1 E1 lines using microphone connected to the sound card i.e., stream audio to channel/subchannel from the sound card

  • Listen/Drop speech on T1 E1 lines using PC speakers or Headphone using sound card - Stream audio from channel/subchannel to sound card

  • Supported codecs are A-law, Mu-law, 16 k Linear PCM, G.726 40 Kbps, 32 Kbps, 24 Kbps, and 16 Kbps data rates, G.722 (enhancement soon)

  • Mono and Stereo audio modes supported

  • Configure Drop and Insert, codec type, Mono/Stereo Audio Mode, port, Channel, Subchannel for a sound device

  • Automatic detection of sound devices including Virtual Audio Cable (VAC)

Important Applications

  • Audio editing applications like Gold Wave, Adobe Audition that normally send or receive audio streams to and from a sound card can be directed to timeslots on GL's T1 E1 cards

  • Real-time transmit streaming from sound card and viewing of receiving stream

  • Trouble shoot audio problems on T1 E1 timeslots

  • Playback and record mono or stereo signals with audio editing applications directly from T1 E1

  • Audio editing features/special effects such as noise reduction, delay, echo, fade, equalization can be performed with sound aware programs

  • Supports non-contiguous timeslots for performing Drop and Insert actions

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.

GLís 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.

GLís 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) are all available.

GLís 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.

GLís Echo Canceller testing solutions provide the broadest range of simulation and analysis, including line and acoustic echo. GLís compliance testing per G.168. G.167 and P.340 across TDM, IP, VoIP and Wireless networks is widely accepted in the industry.

GLís 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.

GLís 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.

GLís 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.

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


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

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