Abstract: An HF combiner includes a housing having a common terminal and n signal line terminals. The n signal line terminals are coupled to the common terminal within the housing via one of n filter paths in each case. A circuit board arrangement is used for outcoupling and separately transmitting low-frequency signals, and includes a common terminal contact and n signal line terminal contacts. Each of the n signal line terminal contacts is electrically connected or connectable to the common terminal contact via one of n bypass lines in each case. For this purpose, a control device controls n signal line switching devices. When an AISG signal is detected at one of the n signal line terminal contacts, the control device is designed to electrically connect the particular one of the n signal line terminal contacts, at which the AISG signal has been detected, to the common terminal contact.

Abstract: An HF combiner includes a housing having a common terminal and n signal line terminals. The n signal line terminals are coupled to the common terminal within the housing via one of n filter paths in each case. A circuit board arrangement is used for outcoupling and separately transmitting low-frequency signals, and includes a common terminal contact and n signal line terminal contacts. Each of the n signal line terminal contacts is electrically connected or connectable to the common terminal contact via one of n bypass lines in each case. For this purpose, a control device controls n signal line switching devices. When an AISG signal is detected at one of the n signal line terminal contacts, the control device is designed to electrically connect the particular one of the n signal line terminal contacts, at which the AISG signal has been detected, to the common terminal contact.

Abstract: According to the invention, a user connection cable (TAL) that is to be associated with a user connection circuit (SLIC) and is used for connecting at least one user (TN) to at least one communication network is verified regarding switching on of a positive distribution voltage in the strands (a, b). The user connection circuit (SLIC) is initially switched to the silent interval mode and a test impedance (I) is switched between the strands (a, b) of the user connection cable (TAL), whereupon the current (i) flowing across the strands (a, b) and the voltage (u) to ground of a strand (b) are measured. Advantageously, the measurements are taken via measuring devices disposed on the user connection subassembly (SLMA).

Abstract: The invention relates to a method and to a device for testing the function for inverting the polarity on a subscriber connection line (TAL) comprising several wires (a, b), in order to connect at least one subscriber to a subscriber connection line (SLM), which comprises at least one inverting device (RG) and a current measuring device (MG) which is associated with the inverting device (RG). In a first step, the subscriber connection component (SLM) is separated from the inverting device (RG) and forces physical inversion on the wires (a, b) of the subscriber connection line (TAL). In a second step, the inverting function of the inverting device (RG) is activated. In a subsequent third step, the subscriber connection component (SLM) is separated from the device (DC) which forces the physical inversion and is connected to the inverting device (RG). The correct function of inversion is tested during all three steps by measuring the direction of the current flow.

Abstract: There is described circuit arrangement which comprises a protection element. A state of the protection element is determined in a simple and safe manner by means of a detection unit and a specification unit, in addition to an evaluation unit.

Abstract: There is described circuit arrangement which comprises a protection element. A state of the protection element is determined in a simple and safe manner by means of a detection unit and a specification unit, in addition to an evaluation unit.

Abstract: The invention relates to a method and to a device for testing the function for inverting the polarity on a subscriber connection line (TAL) comprising several wires (a, b), in order to connect at least one subscriber to a subscriber connection line (SLM), which comprises at least one inverting device (RG) and a current measuring device (MG) which is associated with the inverting device (RG). In a first step, the subscriber connection component (SLM) is separated from the inverting device (RG) and forces physical inversion on the wires (a, b) of the subscriber connection line (TAL). In a second step, the inverting function of the inverting device (RG) is activated. In a subsequent third step, the subscriber connection component (SLM) is separated from the device (DC) which forces the physical inversion and is connected to the inverting device (RG). The correct function of inversion is tested during all three steps by measuring the direction of the current flow.

Abstract: According to the invention, a user connection cable (TAL) that is to be associated with a user connection circuit (SLIC) and is used for connecting at least one user (TN) to at least one communication network is verified regarding switching on of a positive distribution voltage in the strands (a, b). The user connection circuit (SLIC) is initially switched to the silent interval mode and a test impedance (I) is switched between the strands (a, b) of the user connection cable (TAL), whereupon the current (i) flowing across the strands (a, b) and the voltage (u) to ground of a strand (b) are measured. Advantageously, the measurements are taken via measuring devices disposed on the user connection subassembly (SLMA).

Abstract: In a circuit and method for triggering an over-voltage protection unit, a trigger voltage for an over-voltage protection unit is achieved either by a disconnection voltage of a coil or by a charge process of a capacitor. For feeding these reactances, a signal generator is used.