| 摘要 |
PURPOSE:To reduce a noise quantity generated by the variation of switching voltage, by providing a trunk circuit which is equivalent to the trunk circuit at the other terminal side of a channel of an intra-office device before switching at the preceding stage of a transmitting/receiving device of the intra-office device. CONSTITUTION:Th impedance Z1 of the channel at the side of a transmitting/ receiving device B passing through a switch contact sw from a transmitting/ receiving device A is set equivalent to the impedance Z2 of the channel at the side of a transmitting/receiving device C passing through the active side of the contact sw from the device A. As a result, it is possible to suppress the voltage variation to the device A which receives a reduced effect of electrical conditions following the channel passed through the contact sw from the device A for an intra-office device TRK which supplies power to the device A and when the channel is switched to both devices A and C by the function of the switch sw during communication of information between devices A and B. This reduces the switching noises generated at the side of the device A and ensures a stable supply of power. |
