My comment..Accelerated Technology INC.is a Division of Mentor Graphics..
Accelerated Technology’s Nucleus RTOS, a Key Part of Anywhere, Always-on Portable Wireless Internet-CDMA™ Technology from Tantivy Tantivy Communication Inc.’s revolutionary technology, I-CDMA, enables portable,end-to-end, wireless broadband Internet access. The I-CDMA technology, bolstered byATI’s Nucleus RTOS, will enable wireless telecommunications service providers to offer consumers affordable access to rich Internet content with near symmetric uplink anddownlink capabilities for applications such as streaming media or opening e-mail fileswith large attachments.I-CDMA technology is ideal for anyone who needs the freedom to take the Internetwith them and for those needing a fast and reliable connection to the Internet whenwired technologies aren’t an option. With I-CDMA’s anywhere, always-on Internetaccess, an executive can now immediately access his or her corporate intranet whilesitting in an airport, and a realtor on a property site can e-mail property information andphotos to a prospective buyer in another state real-time.Accelerated Technology’s Nucleus RTOS expands I-CDMA technology via integration with Tantivy’s pioneering TANlink™ system. The Nucleus PLUS kernel, Nucleus NETTCP/IP protocol stack, Nucleus WebServ embedded web server, and support for Telnetserver, FTP client/server and TFTP server were implemented into the design of theTANlink system, which is composed of the TANlink Access Unit (TAU) and theTANlink Signal Processor (TSP). These components, built on the flexible and robust Nucleus foundation, have made I-CDMA technology a reality. Nucleus and TANlink – a Successful Integration The TANlink Access Unit (TAU) is the subscriber modem connected to a user's laptopor desktop computer through a standard Ethernet connection to provide Wide AreaConnectivity through an I-CDMA wireless radio connection. On the other end of that radio connection is the base station containing the TANlink Signal Processor (TSP) to handle the wireless connections to the TAUs. I-CDMA is the physical layer and linklayer technology used on the wireless radio link.The TAU contains a microprocessor that runs I-CDMA software under the NucleusPLUS kernel. Tantivy also uses Nucleus NET, Telnet, TFTP Server and NucleusWebServ products on the TAU. The TSP single board computer runs the I-CDMAsoftware using Nucleus PLUS, Nucleus NET, Telnet and TFTP Client.The I-CDMA software creates a wireless connection that looks like another Ethernetconnection to Nucleus NET. A software engineer at Tantivy wrote a Nucleus devicedriver to encapsulate the I-CDMA logic so they could use the Nucleus NET TCP/IPprotocol stack. In this way, he created a virtual device driver under Nucleus to support their custom interface. On the TAU, there is only one virtual device for the single wireless connection to the base station. However, on the TSP, there are many virtual devices, possibly hundreds, as there is one virtual device for each wireless connection to a TAU.Tantivy developed a custom "packet filter" for Nucleus that allowed packets to beredirected around the normal stack processing. This allowed broadcast packets to be redirected to the custom DHCP server developed for Nucleus. The packet filter allowed the application program to "register" itself to be the desired receiver of a specific packetusing MAC address, IP address, and Protocol or UDP/TCP port number."Our initial RTOS comparison included about 8 different RTOS choices. We quickly narrowed the selection down to two alternatives, with Nucleus ultimately becoming the preferred choice on technical merit alone," commented Tantivy SoftwareDevelopment Engineer, Brian Kilgore. "An additional consideration was the scalability available with Nucleus, and we determined through our evaluation that we could produce a far smaller executable using Nucleus than other alternative solutions. Given our tight memory requirements at the time plus life-cycle costs and performance considerations, we decided to go with Nucleus."Brian Kilgore, Development Engineer, Tantivy Communications, Inc.Nucleus Software Product Used By Tantivy Communications, Inc.• Nucleus PLUS• Nucleus NET• Nucleus WebServ• Nucleus Extended Protocol PackageCopyright Accelerated Technology, All Rights Reserved. Accelerated Technology and Nucleus are registered trademarks of Accelerated Technology, Inc. I-CDMA is a registered Trademark of Tantivy Communications, Inc.
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