| 摘要 |
PURPOSE:To facilitate handling of a night attendant board by operating a main wire trunk as dial-in connection even at night and by performing the transfer connection processing to the extension at the level of fundamental connection of the exchange. CONSTITUTION:For incoming from the main wire side at night, the R relay between night transfer trunks NTT is operated to self-hold and sound the buzzer in night transfer attendant board NATT, and incoming of the main wire is displayed, and the line lamp in NATT is flashed by 120INT. The NATT server depresses the ANS key of the incoming line and hooks off the handset of the telephone circuit, and line connection control is performed by LCON, and one-line NTT is connected to NATT, and the A relay and the B relay are operated in order. Then, the earth of the ANS key in NATT is given to the ANS terminal of NTT, and the NP relay for channel switching and the ANS relay are operated in order, and a DC loop circuit is formed in the main wire side, and a channel is formed between the main wire side and NATT. |
