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Error correction helps maintain the integrity of your data. Different encoding methods allow for detection and correction of those problems. These methods offer different advantages and disadvantages over others.Ī: Any time you send data on a network, you can run into problems with that data. Over time, better and better encoding methods come about.

Some methods have better error correction. Some encoding methods are more efficient. Q: Why don’t we just encode data in one way and stick to that?Ī: Different encoding methods have different advantages. Networking is all about sending messages, so encoding and decoding are crucial to networking. We encode and decode signals so that we have a way to carry data on the signal. Q: Why do we need to encode and decode signals?Ī: If we don’t encode and decode signals, they come in as raw waveforms, i.e. All that crazy travel over cables is unnecessary and fraught with problems. You’d be good for writing data to a hard drive, but you just don’t cut it on a network, do you?ĭata should stay home. Economy and simplicity is the name of my game. I don’t get caught up in all that high-falutin’ stuff. Without a clock, the sending device and the receiving device will get out of sync. The signal sits there at the same voltage level for a long time. What sort of crazy standard would allow for a bunch of bits in a row?Įthernet, for one. What happens when you have a whole bunch of bits in a row? Say you’re trying to send a whole bunch of zeroes?

I like to keep the encoding process simple. I make sure the data gets there, and I can spot errors. After all, I require only half the bandwidth you require.Ī little extra bandwidth is worth the price. I can do it that way or vice versa, depending on how I’m implemented, but I always stick to the rules of that implementation. So you give a positive voltage a one and a negative voltage a zero? When I encode a signal, it starts at zero voltage, but it never gets to go back to zero voltage. I prefer NRZ, but some folks call me NRZ-L for Non-Return to Zero Level. Is there something I can call you for short?