Siemens Aktiengesellschaft

Rohde and Schwarz Gmbh & Co. Kg

Nokia Siemens Networks Gmbh & Co Kg

Nokia Solutions and Networks Gmbh & Co. Kg

Roland Krimmer

Andreas Ziegler

Rudolf Dollinger

Bernhard Sieben

Martin Peschke

Robert Lechner

Alexander Kunze

Hans-Werner Rudolf

Heike Diegel

Paul Kunisch

Reiner Franke

Dirk Gehrke

Mirko Soellner

Ludwig Dirscherl

Gottfried Czech

Roland Sieben

The invention relates to a power-over-fiber (PoF) system, comprising: an optical source configured to generate an optical signal, wherein the optical signal comprises an intensity modulation; an optical fiber configured to receive the optical signal from the optical source and to guide the optical signal; an optical sink, which is configured to receive the optical signal from the optical fiber and to convert the optical signal into an electrical signal; a detection unit, which is configured to detect at least one characteristic of the electrical signal, wherein the characteristic is at least partially caused by the intensity modulation of the optical signal; and a control unit, which is configured to control the optical source based on the detected characteristic.

Power-over-fiber system and method for operating a power-over-fiber system

The present invention provides an electrically isolated acquisition of a measurement signal by means of a measurement probe. For this purpose, a probe arrangement is provided with a probe head for electrically measuring a signal. The probe head is coupled to a probe coupler via optical links. In particular, optical links are used for power supply of the probe head and for forwarding optical signals corresponding to the measured electrical signal.

Probe head, probe coupler and probe arrangement

An electrical measurement system for performing a measurement on a device under test has a main unit, a probe unit connected to the main unit, a first offset generator for generating a first offset influencing the measurement, and a second offset generator for generating a second offset influencing the measurement. The first offset generator has a first analog step size and the second offset generator has a second analog step size. The first and second analog step sizes differ from one another.

Electrical measurement system and method for establishing a desired total offset

A differential probe provides a probe input which comprises two inputs for recording a first and second input signal. The differential probe further provides a first amplifier which is connected to the two inputs. The differential probe additionally provides a compensation device, which generates and superposes on the first and second input signal a differential offset signal. The compensation device also generates a common-mode offset signal which is independent of the differential offset signal.

Differential probe with common-mode offset

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).

Method and device for checking the connection of a positive supply voltage to a subscriber access line comprising a plurality of wires

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.

Method and device for checking the function for inverting the polarity on a subscriber line comprising a plurality of wires

An adjustment and current-measurement method for a subscriber line circuit of a digital telephone exchange is integrated in the low-voltage section of the subscriber line circuit. A previously determined disturbance variable, which is stored in the low-voltage section with a reversed mathematical sign, is added to the currents which are to be measured, for example, for an adjustment of the supply current or of the operability of the subscriber line circuit. This makes it possible to carry out a current measurement for already corrected current levels.

Method for adjusting current levels, which have been falsified by offset-current levels, in a subscriber line circuit

In connection with the checking of data stocks by check sum formation (e.g. CRC checking), subgroups of the data group being checked contain dummy bytes wherein, given desired modification of the individual bytes, the dummy bytes in relevant subgroups are modified such that an intermediate check sum remains unmodified.

Method for checking groups of data formed from a plurality of bytes

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.

Circuit and method for triggering an over-voltage protection unit

An interface circuit with integrated test functions relating to the subscriber line, with a test circuit realized in the simplest case by an ohmic resistance, and comprising a relay circuit having two changeover contacts by means of which in one switching position the leads of the subscriber line are connected with the interface circuit, and in the other switching position the subscriber line is disconnected and the test circuit is connected to the interface circuit.

Subscriber terminal circuit for connecting an analog subscriber line to

The invention describes a protective circuit for the protection of the electronic interconnect circuit (SLIC) and the electronic switches for test access, by means of a threshold setting element which is provided for each conductor (a,b) of a core pair for the shunting of overvoltages to ground, as well as a current path of higher breakover voltage for each conductor of the core pair, which permits checking the subscriber line circuit for line interruption during a malfunction of the threshold setting element.

Protective circuit for the overvoltage protection of a subscriber line

A protective circuit for the electronic interface circuit (SLIC) as well as the electronic switches for test access is described, in which a first threshold setting element for each conductor of the core pair is connected between the line side and a test access and/or isolation switch and the test access switch for the related first conductor of the core pair, for conducting overvoltages to ground, as well as a second threshold setting element bridging access switch which is connected to ground via a third threshold setting element.

Growing community of inventors

Germering, Germany

Roland Krimmer