WANs: are extensible
Nationwide networks allowing users to exchange data from virtually any location with mobile stations, base stations, network systems
Provide speeds of 144 kbps (goal is 2Mbps)
First generation (1978): originally for analog voice transmission with frequency division multiplexing
Second generation (1990s): all digital, primarily voice
Development of competing technologies in US/Europe
2.5 G: uses packet switching
2.75 G: uses fast packet switching for data services
I. What is mbusiness?
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