Patent ID: 6157098
Filing Date: 2000-12-05
Classification: H04B

Abstract:
A feed line connecting circuit for selectively connecting first, second and third line connecting terminals under a predetermined current feeding condition, comprising:a first current detector connected between one of said first and second feed line connecting terminals and a central node for detecting a current over a first predetermined value;a first switch connected between said one of the first and second feed line connecting terminals and said central node for connecting said one of the first and second feed line connecting terminals to said central node in an unpowered condition;a selective switch controlled by said first current detector, the selective switch having first and second selective contacts and a common contact connected to said third feed line connecting terminal, the common contact being connected to the first selective contact when the first current detector does not detect a current over the first predetermined value, and to the second selective contact when the first current detector detects a current over the first predetermined value; anda second current detector connected between said first selective contact of said selective switch and said central node to open said first switch to disconnect said one of the first and second feed line connecting terminals from said central node when detecting a current above a second predetermined value.