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Near Filed Communication (NFC)
Near Filed Communication (NFC) is a close range radio
communication protocol used for very sensitive applications. It was
jointly developed by Sony and Philips. The standard specifies ways to
establish P2P(Peer-to-Peer) communication links for data exchange. After
the P2P network has been configured, another wireless communication
technology, such as Bluetooth or Wi-Fi, can be used for longer range
communication or for transfering larger amounts of data. Its development
was parallel to RFID (Radio Frequency Identification), but both differ
in many ways.
NFC offers a very short range as compared to RFID.
This is an added advantage in the sense that it requires very little
transmission power and cheap transmitters can be used for the purpose.
Hence it is very suitable for Smartcard like applications. It can also
work in both active and passive modes. NFC works on a frequency range of
13.56 MHz. It offers a baud rate of 106 kbps to 424kbps.
The transmission is made from a frequency of 13.56MHz
inductively, hence it uses high magnetic field. At a transaction only
two participants can be involved - one transmitter (initiator) and one
receiver (target). The transmission can be either in active fashion or
passive fashion. Both have their own merits and demerits. The NFC
transmission runs helping duplex, i.e. that one of the two devices can
send only in each case or receive at a time
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