| 摘要 |
<p>An arrangement of plural filter circuits (28) on a single card (26), and interconnection and mounting of numerous cards on a single rack to facilitate maintenance, is provided for use in a telco (20). In each of the filter circuits, there is a first plurality of inductors connected in a series in a first leg of a balanced line configuration of filter, a second plurality of inductors connected in a series in a second leg of the balanced line configuration of filter, and a plurality of capacitors connected as cross branches between terminals of the inductors. A substrate supports the capacitors and the inductors, wherein each of the inductors is a toroidally wound inductor comprising a toroidal core of magnetic saturation inhibiting material. The saturation inhibiting core material allows reduction in size of a cross-sectional dimension of the core to approximately the cross-sectional dimension of one of the capacitors. For telco equipment, a set of connectors (36) is mounted in a black plane (38) of an enclosure for receiving the cards, and a plurality of bypass switches (40) are disposed in the set of connectors for bypassing voice signals around corresponding ones of the cards. The bypass switches (40) are placed in a state of conduction upon removal of a corresponding one of the cards from the set of connectors.</p> |
