Abstract: In order to provides a practical way how detailed power consumption data can be made available to a control plane or network management system for optimizing the overall power consumption of an operator's network, the present invention proposes a method and related apparatus, which determines a power consumption per input/output port of a telecommunications network (NE) node by providing (S1) offline power measurement values per input/output port; performing (S2) online power consumption measurements on individual network cards (LC-1LC64; LC) each supporting several such input/output ports; aligning (S3) online and offline measurement values; and correlating (S4) determined power consumption values with the current usage of said input/output ports.

Abstract: In order to provides a practical way how detailed power consumption data can be made available to a control plane or network management system for optimizing the overall power consumption of an operator's network, the present invention proposes a method and related apparatus, which determines a power consumption per input/output port of a telecommunications network (NE) node by providing (S1) offline power measurement values per input/output port; performing (S2) online power consumption measurements on individual network cards (LC-1LC64; LC) each supporting several such input/output ports; aligning (S3) online and offline measurement values; and correlating (S4) determined power consumption values with the current usage of said input/output ports.

Abstract: The invention relates to a method and devices for a packet switching system for traffic-load dependent power reduction in packet switching systems. In order to reduce the power consumption of a packet switching system, the method comprises the steps of determining a traffic rate for incoming data packets at the upstream packet processing device; processing the incoming data packets; transmitting an indication of the determined traffic rate from the upstream packet processing device to the downstream packet processing device at a time prior to the time that the processed data packets for which the traffic rate has been determined are transmitted to the downstream packet processing device; and adjusting available packet processing resources at the downstream packet processing device based on the received traffic rate indication.

Abstract: The invention concerns a method of performing an intra-segment handover (HO) of a mobile station (MS) from a source access point (AP1) of a tree-structured segment (S1) of an Ethernet-compliant telecommunication network to a target access point (AP2) of said segment (S1), as well as a switch (SW-123) to support the execution of this method. After establishing contact between the mobile station (MS) and the target access point (AP2), the mobile station (MS) sends an update entry request addressed to the segment gateway switch (GW). The update entry request is received by a switch (SW-123) positioned in the tree structure of the segment (S1) hierarchically above the source and target access points (AP1, AP2) and below the segment gateway switch (GW). The switch (SW-123) checks whether its forwarding database contains a first entry comprising an address of the mobile station (MS) received by means of the update entry request.

Abstract: The invention includes a method and apparatus for synchronizing line card forwarding databases. A method includes receiving a data packet at a line card, generating a control packet for each of at least one other line card to enable an address update operation thereat, and propagating the at least one control packet toward the at least one other line card. The control packet, or packets, is generated in response to a determination to perform an address update operation for the received data packet. The address update process may be implemented as an ingress address update process or an egress address update process. This address update process performed in conjunction with an address aging process.

Abstract: The invention relates to a method and devices for a packet switching system for traffic-load dependent power reduction in packet switching systems. In order to reduce the power consumption of a packet switching system, it is proposed that the method comprises the steps of determining a traffic rate for incoming data packets at the upstream packet processing device; processing the incoming data packets; transmitting an indication of the determined traffic rate from the upstream packet processing device to the downstream packet processing device at a time prior to the time that the processed data packets for which the traffic rate has been determined are transmitted to the downstream packet processing device; and adjusting available packet processing resources at the downstream packet processing device based on the received traffic rate indication.

Abstract: The invention concerns a method of performing an intra-segment handover (HO) of a mobile station (MS) from a source access point (AP1) of a tree-structured segment (S1) of an Ethernet-compliant telecommunication network to a target access point (AP2) of said segment (S1), as well as a switch (SW-123) to support the execution of this method. After establishing contact between the mobile station (MS) and the target access point (AP2), the mobile station (MS) sends an update entry request addressed to the segment gateway switch (GW). The update entry request is received by a switch (SW-123) positioned in the tree structure of the segment (S1) hierarchically above the source and target access points (AP1, AP2) and below the segment gateway switch (GW). The switch (SW-123) checks whether its forwarding database contains a first entry comprising an address of the mobile station (MS) received by means of the update entry request.

Abstract: The invention includes a method and apparatus for synchronizing line card forwarding databases. A method includes receiving a data packet at a line card, generating a control packet for each of at least one other line card to enable an address update operation thereat, and propagating the at least one control packet toward the at least one other line card. The control packet, or packets, is generated in response to a determination to perform an address update operation for the received data packet. The address update process may be implemented as an ingress address update process or an egress address update process. This address update process performed in conjunction with an address aging process.

Abstract: The delay setting of an optical delay line interferometer (DLI) used to decode differentially encoded phase shift keyed signals (DPSK or DQPSK) is controlled using a control signal representative of the ratio Perr2/Perr1 of the rate of occurrence of double errors and the rate of occurrence of errors. The ratio Perr2/Perr1, as the delay setting of the DLI is varied, exhibits a characteristic W-shaped structure consisting of a local maximum at the optimum value and two minima adjacent to the maximum, one on each side of it. This structure is present over a wide range of signal to noise ratio and residual dispersion.

Abstract: The invention proposes a method for feedback control, in which a portion of a data signal is split and rectified and the signal intensity is detected with slow speed electronics for improving the control of a delay line interferometer (DLI) used in optical data transmission. A control signal is generated and fed back to the DLI based on the detected signal intensity. The invention further proposes a device provided with a DLI, a first and second optoelectronic component, and a differential amplifier.

Abstract: A method of signal equalization of a transmitted bit stream by means of a feed forward equalizer is provided, whereby the signal is decomposed into at least two components and the components are multiplied with equalization parameters to form equalized components, which are superposed to form an equalized signal, and whereby conditional bit error rates by counting faulty transmitted bits in dependence of preceding and succeeding bits are determined and the equalization parameters are tuned dependent on the determined conditional bit error rates.

Abstract: The delay setting of an optical delay line interferometer (DLI) used to decode differentially encoded phase shift keyed signals (DPSK or DQPSK) is controlled using a control signal representative of the ratio Perr2/Perr1 of the rate of occurrence of double errors and the rate of occurrence of errors. The ratio Perr2/Perr1, as the delay setting of the DLI is varied, exhibits a characteristic W-shaped structure consisting of a local maximum at the optimum value and two minima adjacent to the maximum, one on each side of it. This structure is present over a wide range of signal to noise ratio and residual dispersion.

Abstract: The invention proposes a method for feedback control, in which a portion of a data signal is split and rectified and the signal intensity is detected with slow speed electronics for improving the control of a delay line interferometer (DLI) used in optical data transmission. A control signal is generated and fed back to the DLI based on the detected signal intensity. The invention further proposes a device provided with a DLI, a first and second optoelectronic component, and a differential amplifier.

Abstract: A method of signal equalization of a transmitted bit stream by means of a feed forward equalizer is provided, whereby the signal is decomposed into at least two components and the components are multiplied with equalization parameters to form equalized components, which are superposed to form an equalized signal, and whereby conditional bit error rates by counting faulty transmitted bits in dependence of preceding and succeeding bits are determined and the equalization parameters are tuned dependent on the determined conditional bit error rates.