NFC SIGNALLING TECHNOLOGIES
Three signalling technologies exist which enable NFC devices to talk to one another. These are NFC-A, NFC-B, and NFC-F. When a reader and a tag make come into range of each other, they initially communicate which technology they can understand and then transmit data in compliance with the specified protocol.
Different NFC signalling technologies ensures various types of NFC technology can easily communicate with one another. Easy access is the key to NFC and is one of its primary benefits.
NFC-A corresponds with RFID Type A communication. Type A communication (Miller encoding), also known as delay encoding, is used with amplitude modulation at 100%. Hence a signal sent between devices must change from 0 to 100 per cent to register the difference between sending a “1” and a “0.” Data is transmitted at 106 Kbps when using Type A communications.
Similar to NFC-A, NFC-B corresponds with RFID Type B communication. Type B uses Manchester encoding. Amplitude modulation is set at 10%. A 10% change to 90% is used for low, while 100% is used for high. A change from low to high represents a “0” while high to low represents a “1.”
NFC-F refers to a faster form of RFID transmission known as FeliCa which is more commonly found in Japan. FeliCa is a technology similar to NFC but faster. It can be used for a variety of services such as train tickets, credit card payments, and access control.
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