| 摘要 |
PURPOSE:To prevent mis-start by inserting a filter attached/detached by a relay between the 1st terminal equipment and a subscriber telephone line and inserting the said filter when the 2nd terminal equipment is started. CONSTITUTION:The filter comprised of coils 3, 4 and a capacitor is inserted between the 1st terminal equipment 11 and the subscriber telephone line L. Relays A, B are activated when the 2nd terminal equipment 21 is started from the master station via the telephone line L. When the equipment 21 is started, normally closed contacts a1, a2 of the relay A are opened and the contact (b) of the relay B is closed. Thus, the start frequency component of the equipment 11 in the data signal of the equipment 21 is blocked by the filter comprised of the coils 3, 4 and the capacitor 5.
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