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Fujitsu’s new KeyStream access controller combines a unique blend of features to make the provision of video services over ADSL or VDSL connections easily realisable.

The KeyStream device unites the processing power of a 100 MIPS embedded RISC, dedicated ATM Segmentation and Re-assembly processing, and MPEG video framing with LAN interfaces, enabling the provision of multiple services over a single xDSL connection.

ADSL has shown impressive deployment levels over the last few years, bringing the benefits of high speed Internet access to tens of millions of consumers, world-wide. Continued growth of broadband access beyond the “early adopters” segment of the market requires compelling new services to attract a wider user base. Certainly, ADSL and VDSL are more than capable of delivering high bandwidth services such as video to the residential user, with the underlying ATM protocol providing the Quality of Service control necessary to successfully mix data streams of wildly differing priorities.

The key to making such services ready for deployment is availability of products to allow development of cost effective, versatile residential equipment with the flexibility to manage multiple services. The KeyStream product has been developed by Fujitsu with just these needs in mind and builds on the experience gained from its current ADSL, ATM and MPEG product ranges. KeyStream is the key component completing the ADSL Set-Top Box chipset solution, accompanying the KeyWaveTM ADSL Modem and RAMPEGTM MPEG-2 Decoder.

By choosing to use KeyStream, the development of an xDSL set-top box can be reduced to a simple modification of an existing satellite, cable or terrestrial box. Fujitsu’s software development team have produced code to control the data path and manage the services provided by the xDSL connection, and integration of service management with middleware is simplified by the availability of high level APIs for the KeyStream operating across its co-processor interface.

“We believe that this approach to high level software integration will be crucial to the swift provision of xDSL STBs in order to satisfy the growing demand for the exciting new services available over broadband” said Dan Parker, Systems Architect of the KeyStream. Johannes Richter, Director of the Multimedia Business Unit, added “STB developers need a system solution and can not afford to get involved in xDSL interfaces and data path issues when their expertise lies in picture decoding and middleware. This is why Fujitsu is providing both low cost silicon and software support for ease of integration.”

KeyStream is the first in a family of access controller devices, a combined RISC and ATM SAR device with UTOPIA, MPEG-TS, USB, and Coprocessor interfaces. In addition a 32-bit SDRAM interface and configurable GPIO is provided. A higher functionality dual port Ethernet version is due to sample in Q3CY02.

Available now in sample quantities, with mass production already underway, the 108 MHz device is provided in a 208 pin plastic QFP package and operates from 2.5 Volts with 3.3 Volt I/O. A Customer Development Kit implementing Video over ADSL is available and source code for all Fujitsu developed software is provided with the product.

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