A four-wire terminating set (4WTS) is a balanced transformer used to perform a conversion between four-wire and two-wire operation in telecommunication systems. For example, a 4-wire circuit may, by means of a 4-wire terminating set, be connected to a 2-wire telephone set. Also, a pair of 4-wire terminating sets may be used to introduce an interme...
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http://en.wikipedia.org/wiki/Four-wire_terminating_set
an assembly of apparatus used to terminate the go and return channels of a four-wire circuit, and to provide connections between these channels and a two-wire circuit
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=704-04-18
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