Patent ID: 8121272
Filing Date: 2012-02-21
Classification: H04M

Abstract:
1. A device for switching over a telecommunication terminal, the device including a switchover unit, comprising: a control input, a first switching input, a second switching input, and a switching output, the switchover unit switching an electrically conductive connection between the first switching input and the switching output or between the second switching input and the switching output as a function of a signal at the control input; a first connecting path connecting a first transmission path between the device and a transmission network, the first connecting path connected to the first switching input; a second connection path connecting a second transmission path between the device and the transmission network or a further transmission network, the second connection path connected to the second switching input; an electrically conductive terminal connecting path connecting a terminal and the switching output; a call signal detection unit having an input coupled to the second connecting path, the call signal detection unit including an output and generating an output signal at the output as a function of an occurrence of a call signal, intended for the terminal, on the second connecting path; a control unit having an input coupled to the output of the call signal detection unit, the control unit including an output at which an output signal is generated as a function of a signal applied to the input of the control unit; a connection located between the output of the control unit and the control input of the switchover unit; a first detection unit having input coupled to the first connecting path, the first detection unit having an output and generating an output signal at the output of the first detection unit as a function of a signal detected at the input of the first detection unit, the signal detected at the input of the first detection unit indicating a connection state of the first connecting path; and a second detection unit having an input coupled to the second connecting path, the second detection unit having an output and generating an output signal at the output of the second detection unit as a function of a signal detected at the input of the second detection unit, the signal detected at the input of the second detection unit indicating a connection state of the second connecting path; wherein the input of the control unit is connected to the output of the first detection unit and to the output of the second detection unit; wherein the control unit includes an OR logic unit that has a plurality of inputs and that carries out a logic OR operation of signals supplied at the plurality of inputs of the OR logic unit, the OR logic unit has an output that outputs an output signal as a function of a result of the logic OR operation; wherein the output of the second detection unit is connected to one of the plurality of inputs of the OR logic unit; wherein the output of the call signal detection unit is connected to a further one of the plurality of inputs of the OR logic unit; wherein the control unit includes an AND logic unit that has a plurality of inputs and an output and that carries out a logic AND operation of signals supplied at the plurality of inputs of the AND logic unit; wherein the OR logic unit has an output that is connected to one of the plurality of inputs of the AND logic unit; wherein the output of the first detection unit is coupled to a further one of the plurality of inputs of the AND logic unit; and wherein the output of the AND logic unit is connected to the output of the control unit.