Abstract: An information storing equipment having a plurality of storage units which store information therein, and a control unit which accommodates one or more communication circuits therein and which controls the connections between the communication circuit(s) and the plurality of storage units; the control unit comprising a detector which detects information for identifying a destination terminal of information entered via the communication circuit, and a switching unit which delivers the entered information to the specified storage unit that is determined in accordance with a content of the detected identification information for the destination terminal.

Abstract: A time division exchange provided with a plurality of compression circuits for carrying out signal compression in accordance with a plurality of compression laws and a plurality of expansion circuits for carrying out signal expansion in accordance with a plurality of expansion laws is operated in the following manner. In a case where the exchange is used as an originating exchange, a compression circuit provided in the originating exchange for carrying out signal compression according to a desired compression law is selectively used at each time slot, and information on the desired compression law is sent out from the originating exchange. Further, in a case where the exchange is used as a destination exchange, an expansion law to be used on the receiving side is selected on the basis of the above information, and an expansion circuit provided in the destination exchange for carrying out signal expansion according to the selected expansion law is selectively used at each time slot.