| 摘要 |
PURPOSE:To block the unnecessary operation of an exchange and to receive an incoming call by avoiding a DC loop of a subscriber line from being closed during the registration of an abbreviated dial in a radio telephone equipment connected to a subscriber line for use. CONSTITUTION:When a call comes from a radio telephone set 40, a dial key discrimination circuit 34 of a master equipment 20 decided whether or not the operation is the dialing or the abbreviated dialing depending on the kind of the dial key operated successively, a control circuit 30 turns on a line relay 22 in case of the dialing only to close a DC loop of the subscriber line 1 and in case of the abbreviated dial registration, registration control is applied while opening the line relay 22. Thus, the abbreviation dial is applied while the DC loop of the subscriber line is kept open. Thus, the unnecessary operation of the exchange is avoided during the abbreviation dial registration and since the radio telephone set is idle from the exchange and the incoming call is received. |
