| 摘要 |
<p>A branching unit (10) for an underwater communications system is provided with a switching circuit (20,21,22) comprising a delay circuit (23) coupled between two terminations (12,13) for constraining the power routing configuration of the branching unit (10) in the presence of a shunt fault. Preferably, the delay circuit (23) is responsive to a rate of increase of an applied current, whereby the delay circuit (23) is only operative when the rate of increase of applied current is below a predetermined level. <IMAGE></p> |
