AT&T Successfully Demonstrates PCS-Spectrum CDMA at Wireless '95.NEW ORLEANS--(BUSINESS WIRE)--Feb. 1, 1995--AT&T Network Systems today successfully demonstrated its 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. wireless technology for Personal Communications Services See PCS. at the Cellular Telecommunications Industry Association's Wireless '95 trade show in New Orleans New Orleans (ôr`lēənz –lənz, ôrlēnz`), city (2006 pop. 187,525), coextensive with Orleans parish, SE La., between the Mississippi River and Lake Pontchartrain, 107 mi (172 km) by water from the river mouth; founded . The company invited its customers for a drive through New Orleans, during which it demonstrated both mobile-to-mobile and mobile-to-land calls using the new technology. AT&T installed two CDMA (Code Division Multiple Access) cell sites in the New Orleans area for this purpose, operating at a frequency of 1.8 GHz, the Personal Communications Services (PCS (1) (Personal Communications Services) Refers to wireless services that emerged after the U.S. government auctioned commercial licenses in 1994 and 1995. This radio spectrum in the 1. ) spectrum band. Passengers in AT&T's CDMA car were able to experience first-hand the soft handoff In CDMA cellular phone systems, a smooth transition from one cell to another. Unlike analog FDMA and digital TDMA systems, which use different frequencies in adjacent cells, CDMA uses the same frequencies but codes each conversation differently. between cell sites -- no clicks or interference as the car moved from one cell site to the next. They also learned about CDMA's enhanced privacy through speech encoding, and low power requirements, which translate to longer battery life in phones. "We view CDMA as an excellent technology for many reasons -- its compatibility with the North American North American named after North America. North American blastomycosis see North American blastomycosis. North American cattle tick see boophilusannulatus. network, its capacity and inherent capabilities which will reduce overall network costs, and the exceptional voice quality consumers will have with planned 13 kilobit (thousand bits). For technical specifications, it refers to 1,024 bits. In general usage, it typically refers to an even one thousand bits (see kilo). Also Kb, Kbit and K-bit. See space/time. (unit) kilobit - 2^10 = 1024 bits of storage (1 Kb). technology," said Jim Brewington, president of AT&T Network Wireless Systems. "AT&T will support whichever PCS standards our customers demand, but we believe strongly that North American standards -- like CDMA or TDMA (Time Division Multiple Access) A satellite and cellular phone technology that interleaves multiple digital signals onto a single high-speed channel. For cellular, TDMA triples the capacity of the original analog method (FDMA). -- are better suited to the North American market than are European standards, because of their overall compatibility with the North American network -- particularly in terms of interconnection to existing cellular networks and the rest of the Public Switched Telephone Network," Brewington said. The company will introduce both CDMA-based and TDMA-based PCS infrastructure equipment in 1995. AT&T's PCS Systems, based on proven technology platforms, are complete wireless communications solutions with a wide range of features and advanced capabilities. AT&T Network Wireless Systems is a unit of AT&T Network Systems, which is a worldwide manufacturer and marketer of network telecommunications products. The company offers communications service providers virtually everything they need to build and operate their wireless and landline networks. CONTACT: AT&T Rich Larris 201/606-2473 (office) 908/446-1380 (home) Wireless '95 Booth No. 2924 Barbara Mierisch 201/606-2457 (office) 201/736-5739 (home) |
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