| Wireless Data
Transmission |
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| n | employ
digital (cellular) system to provide |
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| effective
integrated voice and data services |
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| – | GSM
(originally “Groupe Special Mobile”, now |
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| “Global
System for Mobile Communications) |
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| developed
in Europe, at 890-960 MHz with 1000
full- |
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| rate
traffic channels at 270 kbps, widely spread |
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| – | DCS1800:
based on GSM, operates in 1.8 GHz band, |
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| three
times capacity of GSM |
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| – | North
America: IS54 and IS95 |
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| n | two
incompatible standards (TDMA versus CDMA) |
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| n | GSM
is making inroads into North America (PCS1900) |
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