| 摘要 |
PURPOSE:To inhibit a dial pulse from being supplied to a remote telephone set through a channel by forming the channel after dialing operation in case of individual extension calling operation. CONSTITUTION:Operation data on dial key is received by a control circuit CTm to transmit control data. A relay TK is controlled and restored to connect a talking circuit TKC including dialing switch to a talking line LT, forming the channel. Therefore, a dial pulse generating circuit DPG operates according to the operation of a push-button dial PD, and consequently even when dialing switches in the talking circuit TKC are turned on and off, no dial pulse is sent out to the talking line LT because the relay TK is in operation during dialing operation and a contact tR is still off, thereby preventing dial pulse from being supplied to the remote telephone set. |
