Cẩm nang dữ liệu không dây P5

Chia sẻ: Tien Van Van | Ngày: | Loại File: PDF | Số trang:13

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Cẩm nang dữ liệu không dây P5

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PUBLIC TERRESTRIAL CIRCUIT SWITCHED NETWORKS REPRESENTATIVE NATIONWIDE NETWORKS Nationwide circuit switched networks exist in vehicular, mobile applications; the successful ones use the existing voice cellular network as a “last mile” solution. One well-known system is that of United Parcel Service (UPS), which has no voice capability in its devices. During 1998 UPS began its move to a packet switched approach via a public network: ARDIS. Other circuit switched systems are also beginning to experiment with packet alternatives, from hybrid CS-CDPD through Cellemetry. The prominent cellular alternative, Nextel’s digital network, is nationwide by pricing and advertising but has huge coverage gaps....

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