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Programming Wireless Devices with the Java™ 2 Platform, Micro Edition, Second Edition by Jim Holliday - Editor, Aleksi Uotila, Mark Patel, Jyri Huopaniemi, Jim Van Peursem, Antero Taivalsaari, Roger Riggs

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15.1. Characteristics of Wireless Data Networks

The MIDP Specification version 2.0 addresses two types of wireless data networks: circuit-switched data (CSD) and packet-switched data (PSD). A wireless circuit-switched network (also called a session-based network) assigns a user a radio channel, which it dedicates to the connection until the data transfer is done. During the data exchange, the channel cannot be used for anything else. The GSM cellular phone network is a circuit-switched data network.

Data over a circuit-switched network is usually billed on a time basis, like voice transmissions. Using a circuit-switched wireless network for data transfer can be expensive because data rates in today's wireless networks are rather low. In a GSM ...

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