| 摘要 |
PURPOSE:To reduce the link between the transistor and register from 6 to 3 wires, by providing the information reception relay in common use with the power supply to the caller side monitor relay of register and the communication power supply clock capacitor with the multifrequency code transmission circuit of trunk. CONSTITUTION:The relay A is operated when a call is produced on the trunk ICT, and the link IRL connects between the ICT and the register IR. The relay CO of ICT and relay ON of IR are operative and the transmission and reception of multi- frequency code is started between the trunk and the calling station by using the leads RA, RB. When the marker MKR is caught, power is fed to the trunk allocation position identifying unit TNG. When the relay contacts mr0, mr1 are operated with the multifrequency code transmission circuit OSC for the state (busy) of called party, and transmission is made to the caller station when ms<0>, ms<1>, ms<2> are restored, and IR is restored at the end of transmission. The restoration of IR is self-held at the relay G. Thus, the connection link between ICT and IR is tied with three wires. |
