• verb to take one thing and put another in its place
  • A structure which houses one or more telephone switching systems. At this location, customer lines terminate and are interconnected with each other, in addition to being connected to trunks, which may also terminate there. A. typical exchange handles about 10,000 subscribers, each with the same area code plus first three digits of the 10 digit telephone numbers. Also called central office, local central office, telephone central office, or telephone exchange.
  • The act or process of substituting a thing or function for another.
  • In computers, to replace the contents of one location with that of the other, and vice versa.

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