| 摘要 |
PURPOSE:To test the conduction and mixing function of a multiterminal trunk easily, by connecting an MF (multifrequency code) sender an MF receiver to the multiterminal trunk through a channel. CONSTITUTION:An MF sender MSF1, an FSF2, and an MF receiver MFR are connected to a multiterminal trunk CFC through a channel NW. The MF senders MSF1 and MSF2 send two kind of single-frequency out-of-phase signals A and B simultaneously. Those signals A and B are inputted to two terminals of the multiterminal trunk CFC through the channel NW, and an output from the 3rd terminal of the trunk CFC is supplied to the MF receiver MFR through the channel NW. The MF receiver MFT discriminates whether the input signal is a multifrequency signal A+B or not. Thus, the conduction and mixing function of the trunk CFC are tested easily. |
