Hitachi receives order from KDDI for CDMA2000 1XEV-DO radio access network systems.Hitachi has announced that it has received an order for CDMA (Code Division Multiple Access) A method for transmitting simultaneous signals over a shared portion of the spectrum. The foremost application of CDMA is the digital cellular phone technology from QUALCOMM that operates in the 800 MHz band and 1.9 GHz PCS band. 2000 1xEV-DO radio access network systems for both 2GHz band and 800MHz (MegaHertZ) One million cycles per second. It is used to measure the transmission speed of electronic devices, including channels, buses and the computer's internal clock. A one-megahertz clock (1 MHz) means some number of bits (16, 32, 64, etc. band. KDDI will launch test service in April 2003 for 2GHz band systems and commercial service in autumn 2003 for 800MHz band systems. CDMA2000 1xEV-DO systems provided by KDDI consist of IP network, multi-vender radio access networks, and mobile terminals. Among these, Hitachi is responsible for radio access network. CDMA2000 1xEV-DO, one of 3G mobile communications systems In telecommunication, a communications system is a collection of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment (DTE) usually capable of interconnection and interoperation to form an integrated whole. using CDMA technology, was originally developed by Qualcomm, Inc. (U.S.A.) and optimized for mobile high-speed data services. The system adopts IP based network architecture and provides a peak data rate of 2.4 Mbps within one 1.25MHz CDMA carrier. Due to high compatibility, CDMA2000 1xEV-DO can utilize existing CDMA2000 1x/cdmaOne cell sites, towers, and antennas. Furthermore, CDMA2000 1xEV-DO has been registered to ITU (International Telecommunication Union, Geneva, Switzerland, www.itu.ch) A telecommunications standards body that is under the auspices of the United Nations. Comprising more than 185 member countries, the ITU sets standards for global telecom networks. as one of third-generation Mobile Communication Systems (IMT-2000) after completing its specification in 3GPP GPP Government Performance Project GPP General Purpose Processor GPP General Physical Preparedness GPP Gambian People's Party GPP Good Pharmacy Practice GPP Gross Primary Productivity GPP Green Procurement Program GPP Generic Packetized Protocol 2. Hitachi has been cooperating with KDDI to evaluate the performance and service of CDMA200 1xEV-DO by providing systems for field tests conducted by KDDI in Tokyo since 2000. Hitachi believes the factors for this vender selection were Hitachi's technical experiences gained from these field tests and superiority of equipments. Hitachi will seek to expand the sales of next generation telecommunication telecommunication Communication between parties at a distance from one another. Modern telecommunication systems—capable of transmitting telephone, fax, data, radio, or television signals—can transmit large volumes of information over long distances. systems by leveraging these experiences and its technical know-how. Hitachi, Ltd., headquartered in Tokyo, Japan, is a leading global electronics company, with approximately 320,000 employees worldwide. Fiscal 2001 (ended March 31, 2002) consolidated sales totaled 7,994 billion yen ($60.1 billion). The company offers a wide range of systems, products and services in market sectors, including information systems, electronic devices, power and industrial systems, consumer products, materials and financial services The examples and perspective in this article or section may not represent a worldwide view of the subject. Please [ improve this article] or discuss the issue on the talk page. . |
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