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Newsletter: GL Announces Enhancements to
Voice, Fax, and Modem Testing Solutions

Welcome to GL Communications' Newsletter providing information about our enhancements to product lines involving Voice, Fax, and Modem Testing Solutions.

Trends in Voice, Fax, and Modem Communications

Voice, fax, and modem transmission continue to be dominant forms of communicaton over a wide variety of wired and wireless networks.

Voice is transported over wired networks using traditional telephone lines (PSTN) and over broadband IP networks using VoIP. Wireless networks now carry more voice than wired networks with over 2.2 billion mobile phones or 60% of worldwide phones. Wireless voice growth has yet to peak.

According to some reports, fax transmission has actually increased. Long considered a workhorse in the office, a dedicated fax machine offers the simplicity of feeding a document "as is" and dialing and transmitting to an unattended destination - features that are hard to beat. Also, fax transmission is now being done by PCs with built in text scanners and modems. Fax transmission is so vital that any new technology must address ways and means of transporting it, i.e. Fax over IP (FoIP) and Fax over wireless networks.

Modem transmission over voice lines is still the primary method of accessing the Internet in the US and worldwide. Higher speeds, improved compression, and low cost continue to make dial-up very attractive.

So voice, fax and modem are here to stay for the foreseeable future. To successfully deploy voice, fax, and modem services requires extensive network design, test and traffic engineering. Test equipment can prove valuable in this process, if it can:

  • Generate and receive voice, fax, and modem signals in bulk over wired and wireless networks

  • Monitor and distinguish voice, fax, and modem signals in real time for traffic engineering and network design purposes

  • Analyze voice, fax, and modem signals after capture for troubleshooting failed or poorly handled calls.

GL Communications provides a comprehensive suite of solutions to Voice, Fax, and Modem Testing requirements as summarized below:

Voice, Fax, and Modem Signal Generation and Reception

  • The DCOSS (Digital Central Office Switch Simulator) can generate and receive bulk voice, fax, and modem calls over either E1 T1 trunks or 2-wire analog FXO ports.

Fax and Modem PSTN Call Capture and Analysis

  • GLInsight™ with FAX for PSTN is a powerful and feature rich offline software tool that analyzes pre-recorded PSTN fax calls.

  • GLInsight™ with MODEM for PSTN analyzes modem recordings by appropriate signal analysis, demodulation, phase analysis, error correction and data decompression.

Fax and Modem IP Call Capture and Analysis

  • GLInsight™ with FAX for IP is a powerful and feature rich offline software tool that analyzes pre-recorded IP fax calls.

  • GLInsight™ with MODEM for IP analyzes modem traffic recordings within IP packets, by depacketization of the PCM signal, appropriate signal analysis, demodulation, phase analysis, error correction and data decompression.

Voice, Fax, and Modem Classification

  • GL's T1 / E1 Probe™ provides non-intrusive real-time monitoring and classification of T1 and E1 traffic. All timeslots are monitored in real-time for 16 different traffic types including silence, voice, a variety of data modulations, fax modulations, DTMF digits, and call progress signals.
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