The two main broad categories under which the embedded computer falls are ordinary microprocessors and microcontrollers and they too have many peripherals on chip and thus reducing the cost and size of the embedded computer. It is totally contrasting to the personal computer and there are numerous basic CPU architectures are been used and the word lengths may vary from 4-bit to 64-bits and most of these architectures do come in different variants and in large numbers and various shapes too and are also been manufactured by various different companies. Regarding the 2.4GHz wireless device each of the package will include additional data like the preambles, headers like MAC, IP, TCP etc. and other check sums. The IEEE 802.11 standard of these 2.4 GHz defines various physical layer rates according to the different types of WLANs, such as 1, 2, 5.5 and 11 Mbps for 802.11b and 802.11g. Rates for 802.11g would include 6, 9, 12, 18, 24, 36, 48 and 54 Mbps. The long range in the ISO 15693 permits a complete a hands free access control at the lift of the package.
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