![]() CRC is a popular and powerful means to ensure that a transmitter and receiver can communicate data reliably, even in the worst of conditions. Another method is a code called Cyclic Redundancy Check (CRC). ![]() Parity check and checksum are two ways, but they have limitations. Thankfully, there are some systems that can do this. Since we cannot guarantee a perfect medium between a source transmitter and a destination receiver, some method to detect errors must be employed. If this reversal of a bit occurs, then an error has crept in, possibly undetected. These three gremlins have the ability to turn a digital one bit message into a digital zero bit and vice versa. The damaging effects that can compromise the system are noise, distortion, and interference. If the medium cannot be relied upon for error-free performance, it is useless. The reliability of data communications over distance is of the utmost importance because of the critical requirements of its users. Without this technology, our information age and the Internet would be impossible. The transfer of information via these media is critical for the successful operation of government, military, business, and banking. ![]() In our modern age, the importance of digital electronic data communications by telephone lines, through a modem, special high-speed lines, or over the airwaves by radio cannot be overstated. ![]()
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