ACT Networks Toll Quality Voice Confirmed by Independent QDU Test; ACT Networks' Voice Algorithms Tested by the National Acoustic Laboratories in Australia.ATLANTA--(BUSINESS WIRE)--Sept. 28, 1995--ACT Networks, Inc. (NASDAQ NASDAQ in full National Association of Securities Dealers Automated Quotations U.S. market for over-the-counter securities. Established in 1971 by the National Association of Securities Dealers (NASD), NASDAQ is an automated quotation system that reports on :ANET), a leading provider of integrated frame relay and point-to-point network access solutions today announced the results of an independent QDU test which confirmed that the voice algorithms utilized in ACT Networks' products produce toll quality voice over a frame relay network. The test was conducted by the National Acoustic Laboratories, Australian Hearing Services, as specified in the draft AUSTEL AUSTEL Australian Telecommunications Authority standard TSQDU, December 1993. The evaluation methodology was the internationally accepted computation of Quantization (1) The division of a range of values into a single number, code or classification. For example, class A is 0 to 999, class B is 1000 to 9999 and class C is 10000 and above. (2) In analog to digital conversion, the assignment of a number to the amplitude of a wave. Distortion Unit (QDU). One QDU is the distortion resulting in one encoding and one decoding of speech using 64 Kbps PCM ITUG ITUG International Tandem Users Group ITUG International Telecommunications User's Group ITUG Iowa Telecommunications Users Group .711 as a reference. The lower the QDU, the better the voice quality. In order to be allowed to connect to the international PTTs, voice products must be less than a 3.5 QDU. The ADPCM (Adaptive Differential PCM) A widely used variation of PCM that codes the difference between sample points like differential PCM (DPCM), but can also dynamically switch the coding scale to compensate for variations in amplitude and frequency. 32 Kbps algorithm, the industry benchmark for voice communications, has a QDU of 3.5. ACT's 8 Kbps ACELP ACELP Algebraic Code-Excited Linear Prediction ACELP Association Canadienne des Ecoles de Langues Privées ACELP Adaptive Code Excited Linear Prediction ACELP Algebraic Code Excited Linear Predictive algorithm produced a result of 2.04 QDU, a higher quality voice transmission than ADPCM. The 4.8 Kbps algorithm scored a result of 3.56 QDU. In countries where voice is deregulated, ACT's products offering voice at 8 Kbps are eligible for connection to the PSTN (Public Switched Telephone Network) The worldwide voice telephone network. Once only an analog system, the heart of most telephone networks today is all digital. In the U.S. . "All Voice Over Frame Relay products are not the same," said Martin Shum, president and chief executive officer of ACT Networks. "When compared to CCITT See ITU. CCITT - Commite' Consultatif International de Telegraphique et Telephonique. (International consultative committee on telecommunications and Telegraphy). CCITT changed its name to ITU-T on 1 March 1993. G.721 32 Kbps ADPCM algorithm, ACT's ACELP 8 Kbps algorithm is providing the better voice quality in 1/4 the bandwidth. With ACT's products the user gets toll quality voice in addition to fax and data transmissions over a frame relay network. This results in a significant savings in telecommunications expenses." "Voice compression has come a long way in terms of capability and performance over the last few years," said Ross Kocen, director of product marketing for ACT Networks, and chairman of the Frame Relay Forum's subworking group devoted to Voice Over Frame Relay. "These test results were exactly what we expected to see. ACT is setting the pace in providing the best voice quality possible over frame relay networks." Headquartered in Camarillo, Calif., ACT Networks, Inc. is a leading global provider of cost-effective wide area networking solutions. The company's frame relay and point-to-point integrated access products are utilized for the integrated transmission of voice, data, and facsimile communications using standards-based transmission protocols. ACT Networks markets its products through OEMs and a global network of over 120 reseller organizations. The company has delivered over 10,000 integrated networking products to customers in more than 50 countries. CONTACT: ACT Networks Andre de Fusco, 805/388-2474 adefusco@acti.com or Capital Relations, Inc. Tina Bradford, 805/494-0830 tbradford@caprel.com |
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