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OTM can be like multicast to a range of addresses or a chip to decode one input memory address to many discrete outputs to select one of many devices.
MTO is just the opposite like UDP protocol opens a port from one application and listens to anyone requested to sends you data. ( like P2P magnet) or just a hardware chip to decode separate lines which like a keyboard matrix of many keys which may be scanned in row/column mode to one byte to read the results of which keys are pressed..
But in terms of FEC it is a way of adding redundant bits to detect an error with limited correction. So encoding is OTM where it is one word of predetermined length e.g. 8 bits or 54 bytes or whatever and used to encode many bytes like 256B, 1kB, 4kB or whatever, so one word to many words or bytes. CRC is the term for weak method of error detection only ECC means the CRC is powerful enough to be used for FEC. Overhead depends on length of burst that can be corrected. Usually only 1 small burst of in a block many bytes can be FEC'd. HDD's used to be 11 bits in 1KB were correctable. not sure what is used now.
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