H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 3/08 (2006.01) H03K 17/06 (2006.01) H03K 17/30 (2006.01) H03K 17/687 (2006.01) H04M 3/30 (2006.01)
Patent
CA 2083205
ABSTRACT OF THE DISCLOSURE Remote-controlled master switch facilities are required so that, at the interchange point between the telecommunication network of one operating company to the network of another company, it is possible to determine in which part of the coupled networks an error has occurred, i.e. to facilitate the DC-separation of the networks from each other for measurement purposes. Remote-controlled master switch facilities based on TRIACs and MOS-FETs are known, whereby a common switching threshold is used. When controlled silicon rectifiers are used as electronic switches, the switches are connected to each other via a coupling device so that dial pulses can be transferred from the telephone to the exchange and switches with insensitive control terminals can be used. According to the invention, the application of normally-off MOS-FETs of the enhancement type facilitates a high turn-on threshold and a low turn- off threshold so that the usual measurement process of voltage lowering can be applied. It is also possible to make the turn-on threshold dependent on the polarity of the voltage.
Honl Robert
Radmer Andreas
G. Ronald Bell & Associates
Krone Aktiengesellschaft
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