*****For immediate use April 14th, 1999
NEC Releases ANSI / ITU-T Compliant ADSL Chipset
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| [ µPD98451 / µPD98452 / µPD98453 ] |
NEC Corporation (NEC) (NASDAQ: NIPNY) has developed an asymmetrical digital subscriber line (ADSL)1 system chip-set compliant with ANSI2 and ITU-T3 standards for high-speed communications using internet protocol over existing telephone lines. Consisting of three devices, the chipset is expected to sample from June 1999.
NEC's new ADSL chipset enables high-performance, low-cost solutions to meet the rapidly increasing needs in Europe and North America for high-speed data networks over existing telecommunications infrastructure. Conforming to ANSI, ITU-T, IETF4 and ADSL forum recommendations, the new products fulfill these requirements as well as offering low power consumption and a high degree of space savings.
Complying with the ANSI T1.413 Issue 2 and the ITU-T G.992.1 full-rate ADSL standards, the chipset performs two major functions to enable downstream data transfer speeds of 6.144 Mbit/s and 640Kbit/s upstream (µPD98451). The first major function is the physical layer function performed by the µPD98451 and the analog front-end function performed by the µPD98452. µPD98451 provides DMT5 transmission and reception compliant to the ANSI T1.413 Issue 2 and ITU-T G.992.1 standards, together with support for the Utopia level 26 interface recommended by the ATM Forum. µPD98452 includes Digital-Analog and Analog-Digital converters for communications across telephone lines using oversampling, realized through interpolating and decimation filters.
The second, upper layer function is offered by the µPD98453, a highly integrated System On a Chip (SOC) device centered on a 100 MHz VR4120 MIPS-based 64-bit reduced instruction set computer (RISC) core that follows NEC's highly-acclaimed STB device (µPD61030 ) SOC solution for set top boxes. Integrated with the VR4120 CPU core on µPD98453 is an ATM7 cell processor, an Ethernet* controller, a USB8 controller, a PCI bridge, and a memory interface. The SOC device also incorporates middleware, including TCP/IP9 and IP/PPP over ATM, for transmission and reception of IP packets between PCs over a PCI bus, Ethernet and USB.
Volume production is expected to begin from November 1999 at a rate of 50,000 units per month for each device.
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Notes:
1: ADSL - Asymmetric Digital Subscriber Line. Technology to perform high speed networking by utilizing existing telephone copper lines. "Asymmetrical" refers to transmission and reception of data without a common timing. 2: ANSI - American National Standard Institute. 3: ITU-T: International Telecommunication Union Telecommunications. 4: IETF - Internet Engineering Task Force. Founded in 1986, the IETF is a mostly volunteer organization of working groups dedicated to identifying problems and proposing technical solutions for the Internet. It facilitates transfer of ideas from the Internet Research Task Force (IRTF) to the Internet community and is supported by efforts of the Internet Society (ISOC). The Internet Architecture Board (IAB) provides architectural guidelines for the IETF, and the Internet Engineering Steering Group (IESG) provides overall direction. 5: DMT - Discrete Multi Tone. Technology to transfer signals riding on multiple carriers, which are obtained by separating frequency domains. 6: UTOPIA - Universal Test & Operation Interface for ATM. Refers to a recommendation mainly specifying the procedure for interfacing between ATM-layer devices and physical-layer devices. 7: ATM - Asynchronous Transfer Mode refers to a high-speed method for multiplex transmission of data by means of high-speed circuits of 25Mbps or 155Mpbs in which all information including voice, image, computer data, and so forth is digitized and divided into 48-byte units. Each unit is framed between a start and a stop bit to indicate its beginning and end in a header that includes information such as destination data to produce a 53-byte cell. This cell is the unit of transmission in ATM. 8: USB: Universal Serial Bus Interface. A standard for connecting personal computers with peripherals. 9: TCP/IP: Transfer Control Protocol / Internet Protocol. The most important protocol for handling internet data communications. *: Ethernet is a trademark of U.S. Xerox Corp.
Media Contact:- Aston Bridgman NEC Corporation TEL: +81-3-3798-6511 FAX: +81-3-3457-7249 E-mail: Aston_Bridgman@HO-PRD.ccgw.nec.co.jp |
Customer Contact: NEC Semiconductor Technical Hotline (Information Center) TEL: +81-(0)44-548-8899 FAX: +81-(0)44-548-7900 E-mail: s-info@saed.tmg.nec.co.jp URL: http://www.ic.nec.co.jp/index_e.html |
