| http://www.w3.org/ns/prov#value | - rol system of the exchange and the environment to which the exchange is connected, in particular the telephones connected thereto and otherexchanges.There are also telematic couplers 12 enabling data or voice signals to be interchanged, in particular between telephones via the switching network and the telephone links.There are also computer couplers 13 enabling the control system to be connected
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