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1 Taken literally, the terms 'mobile' and 'wireless' apply to products that are capable of functioning without a tethered connection. This definition would include MP3 music players, digital cameras, as well as communication devices such as mobile phones, Wi-Fi-enabled notebook computers and personal digital assistants (PDAs) with a built-in mobile and/or Wi-Fi connectivity. In this chapter, we shall take mobile and wireless to mean only those products designed for voice and/or data communications and which use radio frequency to connect back to a base station or network.
2 Mobile phones are also known as cellular phones.
3 The maximum transmit powers (EIRP) for WLAN at 2.4 GHz for point to multi-point applications are +30 dBm and +23 dBm for the US and Singapore, respectively.
4 Unfortunately, not all developing countries have opened up the ISM frequency band for general use.