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What is error correction?

Error correction refers to a set of protocols used to recover lost data, due to static or line noise. When a packet of information gets transmitted as an analog signal (waves instead of 1s and 0s) it can easily be distorted. It always gets distorted a little, and sometimes a lot. It's an inherent part of the whole system, so we have to find a way to overcome it. Basically, modems break up their transmission into packets called "frames" and attach a checksum to each of these frames. Any time the recieving modem recieves a frame that doesn't match its checksum, it requests the frame be resent. Though this may slow down data transfer, it makes it much more reliable. There are various protocols used to accomplish this, the most common of which being V.42, V.SREJ, and MNP2-4. These protocols are negotiated during the "handshake".

Turning off error correction may help solve connection problems. Some modems are set to drop the connection if error control doesn't work out, or they simply time out when trying to work out the details. If no error correction is used, a connection can more likely be established on noisy lines, but entire transmissions will have to be resent when a part of the signal is lost or corrupt. So over all, performance will be reduced and it is a much better idea to solve your problem with error correction enabled.


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