| 摘要 |
PURPOSE:To display incoming call to the operator, by detecting the incoming call to the attendant board in a telephone exchanger and transmitting audible signal to the handset for the operator of the attendant board. CONSTITUTION:When a call is incoming to the attendant board, the relay ID is driven with a controller for self-hole. The channel B is connected to an audible signal generator TG via the make sides of the contacts id<0> and id<1> of the relay ID and via the signal channel C of the audible signal to transmit audible signal to the handset of the operator of the attendant board. When the operator responds to the incoming call, the contact ans is open and the relay ID is restored. |
