Switching arrangement for a communications channel

Details Switching arrangement for a communications channel Switching arrangement for a communications channel

H - Electricity

04

M

H04M 3/30 (2006.01) H02H 3/10 (2006.01) H02H 7/20 (2006.01) H04M 3/18 (2006.01) H02H 9/04 (2006.01)

Patent

CA 2139436

A switching arrangement that can be connected in a communications channel that comprises a pair of lines, between sets of terminal equipment, which comprises: (i) a d.c. voltage window detector circuit (3) that is connected between the lines and is responsive to the voltage between the lines; and (ii) one or more switching circuits (2, 4) connected in or between the lines that can be actuated by the window detector circuit (3) when, and only when, the voltage between the lines is within a predetermined band; so that the or each switching circuit (2, 4) can be remotely actuated by means of a d.c. signal on the line, the arrangement includ- ing a low pass filter associated with the or earch switching circuit having a cut off frequency that is sufficiently low to prevent the switching circuit(s) being actuated by a ringing signal on the channel.

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