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 SUNNYVALE, Calif., Aug. 17 /PRNewswire/ -- Stanford Telecommunications, Inc. (NASDAQ-NMS: STII) announced today that its ASIC & Custom Products Division has entered into a follow-on agreement with AT&T Network Systems to develop production-ready headend and subscriber equipment for AT&T's "Voice-Over-CATV" system, Cable Loop Carrier 500 (CLC-500(TM)). The division entered into this agreement following AT&T's successful acceptance testing of Stanford Telecom's prototype units in May of this year.
 The CLC-500, jointly developed by AT&T Network Systems and Antec, will enable cable television and telephone companies to deliver data and voice signals over the same cable and fiber infrastructures now used to deliver cable television. Stanford Telecom was selected as the modem equipment supplier for both the headend and subscriber portions of the system.
 Generally, each home receiving the service utilizes a CLC-500 Subscriber Terminal which includes Stanford Telecom's highly integrated Subscriber Modem. The modem is used to transmit and receive voice signals between the headend station and the subscriber terminal.
 Located at the headend, on the CLC-500 Line Interface Unit (LIU), Stanford Telecom's Line Card Modems have high-capacity burst capabilities to transmit and receive voice signals from CLC-500 Subscriber Terminals. Up to 30 subscribers can be served by each LIU, with a total of up to 16 LIUs per CLC-500 Headend Terminal.
 Stanford Telecom will be developing production-ready units for AT&T's field trials in the United Kingdom which, according to Tom Tighe, senior product planner at AT&T, will begin in the fourth quarter of this year. General availability of AT&T's CLC-500 is expected in the first quarter of 1994.
 Hatch Graham, vice president and general manager of the ASIC & Custom Products Division, states, "A well balanced focus has been placed on both the detailed design for high performance and low cost, as well as the general applicability of the features within the end system. That is, to provide the consumer immediate access to the public switched telephone network without exception." Working to those objectives, Stanford Telecom has designed a state-of-the-art digital architecture that implements an entire high-performance modem within a single VLSI circuit for the subscriber terminal, and a high-capacity coherent detection burst modem using a variety of its proprietary ASICs for the modular line card used within the headend terminal.
 The subscriber circuit incorporates a feature list that combines the market application knowledge of AT&T Network Systems with the advanced digital communication architecture expertise of Stanford Telecom. As an example, the device is designed to automatically accommodate application events such as, power outages, subscriber-induced disconnections, and other physical disturbances to the coaxial cable line. Additionally, it is designed to operate under severe signaling environments that have effect on the signal acquisition, tracking, phase, amplitude and frequency characteristics. The benefit of these features to the subscriber is a unit that, once installed, is highly reliable, requiring little or no maintenance throughout rigorous conditions of operation.
 Furthermore, the device incorporates an elaborate configuration of signal integrity status points that may be remotely managed and monitored through the digital data stream. Consequently, the architecture provides the system operators with an extensive ability to remotely operate and optimize the entire system, even out to the subscriber premises.
 As the designer of the subscriber circuit, Graham has an intimate knowledge of the device's complexity and states, "The device is expected to become a major platform for AT&T and Stanford Telecom in the field of Interactive Communications as new markets continue to evolve."
 AT&T Network Systems, Morristown, NJ, is one of the world's largest manufacturers and providers of network telecommunications equipment. It offers communications service providers virtually everything they need to build and operate their networks.
 Stanford Telecom, headquartered in Sunnyvale, is a leading developer of digital communications equipment. Its commercial ASIC & Custom Products Division, develops and markets cost-effective, highly integrated communication products based upon VLSI technology. The Company is a world-wide supplier of digital communications products, including a comprehensive selection of ICs and subsystems for direct digital synthesis (DDS), spread spectrum wireless communications, VSAT and cable applications.
 NOTE: CLC-500 is a trademark of Antec Corporation. Stanford Telecom is a registered trademark of Stanford Telecommunications, Inc.
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 /CONTACT: Gary Wolf, vice president and chief financial officer, 408-745-2403, or Juli Cross, marketing coordinator 408-541-7833, both of Stanford Telecom; or Angela Cowan of AT&T, 201-606-2454/

CO: Stanford Telecommunications Inc., AT&T Network Systems ST: California, New Jersey IN: TLS SU:

LH -- SJ001 -- 3448 08/17/93 10:00 EDT
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Publication:PR Newswire
Date:Aug 17, 1993

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