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Telecommunication control unitA telecommunication control unit (TCU), line control unit, or terminal control unit[1] (although terminal control unit may also refer to a terminal cluster controller) is a Front-end processor for mainframes and some minicomputers which supports attachment of one or more telecommunication lines.[2] TCUs free processors from handling the data coming in and out of RS-232 ports. The TCU can support multiple terminals, sometimes hundreds. Many of these TCUs can support RS-232 when it is required, although there are other serial interfaces as well. The advent of ubiquitous TCP/IP has reduced the need for telecommunications control units. See alsoReferences
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