| 摘要 |
PURPOSE:To decrease the effect on a general subscriber by disconnecting an exchage side line when a conference device is used to both line side line and exchange side line and connecting both the lines in series when the device is not used. CONSTITUTION:Lines LA3-IN and LA3-OUT in pairs are wired from a line protecting device PD, its one end is connected to a line box LB1 and boxes LB2, 3 are connected in multi-drop form. Further, a pair of exchange side lines LB-IN and LB-OUT and control lines MB 1, 2 are wired from the private branch of exchange PBX, one end is connected to the box LB3 and the boxes LB1, 2 are connected in multi-drop form. The boxes LB1-3 are provided with connector terminals T11-T16, which are connected attachably and detachably with connector terminals of a controller. In holding a conference, the switch of the box connected with the device is opened. |
