Telecommunication control unit

A telecommunication control unit (TCU) was a device present in the now outdated mainframe computers of the past that were attached to a multiplexer channel. TCUs freed mainframes from handling the data coming in and out of RS-232 ports. The TCU would support multiple terminals, sometimes hundreds. Many of these TCUs could support RS-232 when it was required, although there were other serial interfaces as well.

单词	Telecommunication Control Unit
释义	Telecommunication Control Unit 英语百科 Telecommunication control unit A telecommunication control unit (TCU) was a device present in the now outdated mainframe computers of the past that were attached to a multiplexer channel. TCUs freed mainframes from handling the data coming in and out of RS-232 ports. The TCU would support multiple terminals, sometimes hundreds. Many of these TCUs could support RS-232 when it was required, although there were other serial interfaces as well.
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Telecommunication Control Unit

Telecommunication control unit