The present invention relates to a light trunking system, comprising: at least one trunking rail (6) for fastening components (7 . . . 13) of the light trunking system (1) to the trunking rail (6); electrical lines (L3, L4), which run in the trunking rail (6) and can be contacted by the components (7 . . . 13) in order to supply power to the components (7 . . . 13); a data terminal (D1, D2) for receiving data; and a first adapter (16), which is connected to the electrical lines (L3, L4) and to the data terminal and is designed to transmit data received by the data terminal (D1, D2) to a second adapter (17) via the electrical lines (L3, L4) by means of a modulation method.

A method and device for transmitting a message from a first node device to a second node device, the devices using powerline communications. The first node device is able to send and receive fragments of the message on at least one frequency band using powerline communications and over a radio channel. The first node device, prior to the transmission of the fragment: estimates, for at least one frequency band, the theoretical duration of transmission of the fragment on the frequency band, and for the radio channel, the theoretical duration of transmission of the fragment on the radio channel, obtains, from a database, the result of integration of the degree of occupation of the frequency band and of the result of integration of the degree of occupation of the radio channel, selects, from the results of integration, the frequency band or the radio channel and transmits the fragment.

A method and device for transmitting a message from a first node device to a second node device, the devices using powerline communications. The first node device is able to send and receive fragments of the message on at least one frequency band using powerline communications and over a radio channel. The first node device, prior to the transmission of the fragment: estimates, for at least one frequency band, the theoretical duration of transmission of the fragment on the frequency band, and for the radio channel, the theoretical duration of transmission of the fragment on the radio channel, obtains, from a database, the result of integration of the degree of occupation of the frequency band and of the result of integration of the degree of occupation of the radio channel, selects, from the results of integration, the frequency band or the radio channel and transmits the fragment.

A transmission method for transmitting a packet from a first node device to a second node device of an electrical supply network, the transmission method includes the following steps performed by the first node device: transmitting the IP packet by radio frequency in the case where a level of use by the first node device of the transmission by radio frequency calculated on a sliding time window with respect to a maximum use time is below a first threshold, the first threshold being below a second threshold beyond which any transmission by radio frequency is interrupted; transmitting the IP packet by powerline otherwise, and, in the case where the powerline transmission fails, transmitting the IP packet by radio frequency in the case where the level of use is below the second threshold.

A transmission method for transmitting a packet from a first node device to a second node device of an electrical supply network, the transmission method includes the following steps performed by the first node device: transmitting the IP packet by radio frequency in the case where a level of use by the first node device of the transmission by radio frequency calculated on a sliding time window with respect to a maximum use time is below a first threshold, the first threshold being below a second threshold beyond which any transmission by radio frequency is interrupted; transmitting the IP packet by powerline otherwise, and, in the case where the powerline transmission fails, transmitting the IP packet by radio frequency in the case where the level of use is below the second threshold.

A physical layer transceiver for a data channel includes receiver circuitry configured to receive signals on the data channel, transmit circuitry configured to transmit signals onto the data channel, and adaptive filter circuitry coupled to the receiver circuitry and the transmit circuitry and configured to filter the data channel by operating on input frequency-domain data samples to output filtered data samples. The adaptive filter circuitry includes error sample generation circuitry configured to generate error samples representing a difference between a target response and the filtered data samples, arithmetic-only circuitry configured to approximate a windowing function to operate on the error samples, and output sample generation circuitry configured to operate on windowed error samples to provide the output filtered data samples. The comparison circuitry may be configured for time-domain operation and may further be configured to transform the error signals into frequency-domain error signals.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (“DC”) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

It is possible to determine, with a simple configuration, that the connection direction of a cable is the reverse direction. A cable is connected for use between a transmission device and a reception device, and transmits data in one direction. A connection direction determination unit determines whether the connection direction is the reverse direction, on the basis of a result of voltage monitoring at a predetermined position on a power-supply line. When the connection direction is determined to be the reverse direction, the information transmission unit transmits information indicating that the connection direction is the reverse direction, to the transmission device or the reception device.

It is possible to determine, with a simple configuration, that the connection direction of a cable is the reverse direction. A cable is connected for use between a transmission device and a reception device, and transmits data in one direction. A connection direction determination unit determines whether the connection direction is the reverse direction, on the basis of a result of voltage monitoring at a predetermined position on a power-supply line. When the connection direction is determined to be the reverse direction, the information transmission unit transmits information indicating that the connection direction is the reverse direction, to the transmission device or the reception device.

A small cell networking device mountable to a streetlight fixture includes circuitry for converting alternating current power into direct current (DC) power and providing a digitally stable ground for operation of the small cell device. The circuitry includes a transformer isolating a primary side from a secondary side of the circuitry. A switching controller on the primary side directs a switching circuit to selectively permit current flow through a primary side of the transformer to a first ground node on the primary side. A secondary winding of the transformer sources a rectified DC output relative to a second ground node that is isolated from the first ground node. In some cases, compensation on the secondary winding side provides isolated feedback to the controller, such as via an optical isolator. The controller directs the switching circuit based at least on the feedback and input from an auxiliary winding of the transformer.