Abstract: A cable signal detector for being provided at a connector at an end of a communication cable transmitting differential signals or at a relay connector to be connected to the connector to detect an existence of information communication. The cable signal detector includes an amplifier circuit that branches and extracts a portion of a signal transmitted through the communication cable, amplifies the extracted signal and outputs the amplified signal, and a display portion that display the existence of information communication based on the output of the amplifier circuit. The amplifier circuit is mounted on a detection device formed separately from the connector or the relay connector. The connector or the relay connector is configured to transmit the extracted signal to the detection device.

Abstract: A cable signal detector is configured to detect the presence or absence of information communication in a communication cable including a plurality of signal line pairs for differential signaling. The cable signal detector includes a plurality of detecting portions each of which is configured to partially branch and draw a transmission signal from a different signal line pair, rectify the branched and drawn signal into a direct current, and output that direct current, and a displaying portion configured to display the presence or absence of information communication, based on outputs of the plurality of detecting portions. The outputs of the plurality of detecting portions are connected in series, and the displaying portion is configured to display the presence or absence of information communication, based on an overall output voltage of the plurality of detecting portions connected in series.

Abstract: A communication visualization system includes a wireless power-feeding device for transmitting electromagnetic energy in a wireless manner and a communication visualization device for notifying that a LAN cable connected to an information communication apparatus is performing information communication. The communication visualization device includes an antenna part for receiving the electromagnetic energy transmitted from the wireless power-feeding device, a rectifier circuit for rectifying the electromagnetic energy received by the antenna part to generate a DC voltage, an amplifier circuit for amplifying a communication signal transferred to the communication cable at the time of information communication by using the DC voltage generated by the rectifier circuit as operation power, a rectifier circuit for converting the amplified communication signal into a DC voltage, and a light-emitting circuit for emitting light when the DC voltage after conversion is supplied.

Abstract: A repeater includes two connectors to each of which a communication cable is connected and a circuit board on which the two connectors are mounted and which includes a signal transmission section configured to connect corresponding ones of electrodes of the two connectors together, and the two connectors are mounted on different surfaces of the circuit board such that the communication cables are inserted in opposite insertion directions.

Abstract: A signal detecting device provided in a connector at an end of a communication cable or in a communication device to which the connector is connected. The signal detecting device includes a detection circuit that branches and extracts a portion of a signal transmitted through the communication cable and indicates existence of a data communication based on the extracted signal, and a self-diagnostic circuit that inputs a diagnostic signal into the detection circuit upon diagnosis of the detection circuit.

Abstract: A signal detecting device includes a visualization device including a plural connectors to which a communication cable is connected, a plural detecting circuits that are provided for each of the connectors to be detected, branch and extract a part of a signal transmitted through the communication cable connected to the connectors, and indicate an existence of an data communication based on the extracted signal, and a detecting card that is insertable into and detachable from a card connector arranged in the visualization device and mounts at least a part of the detecting circuit.

Abstract: A cable signal detector includes a detection unit that is provided in a connector attached to an end of a communication cable or in a relay connector to be connected to the connector, and branches, extracts and sends a portion of signal transmitted through the cable, and a visualization unit that is provided separately from the connector or the relay connector and includes a light-emitting circuit to emit a light when receiving the signal sent from the detection unit.

Abstract: A communication device is provided wherein a number of the pairs of transmission lines is N, each pair of the transmission lines comprises (N?1) stages of sub-transmission lines generating a same amount of crosstalk as that caused at a connector, and (N?1) stages of connecting portions comprise a transmission path of the connector and a first stage sub-transmission line, and (N?1) stages of the connecting portions to connect an i th stage sub-transmission line and an (i+1) th stage sub-transmission line by the straight/cross connection, and wherein each pair of the transmission lines is different in all pairs in a number of the connecting portion having the cross connection; and as a j th stage connecting portion in any one pair of the transmission lines has cross connection, a (N?j) th stage connecting portion in the any one pair of the transmission lines also has cross connection.

Abstract: A repeater includes two connectors each including electrodes and configured to connect a communication cable through which a differential signal is transmitted, a circuit board on which the two connectors are mounted and which includes a signal transmission section configured to connect corresponding electrodes of the two connectors together, and a signal detection circuit mounted on the circuit board and configured to extract a part of a signal transmitted through the signal transmission section and indicate the presence or absence of information communication based on the extracted signal. The circuit board includes a multi-layer substrate including at least an inner layer in which the signal transmission section is formed, two shield layers configured to interpose the signal transmission section therebetween, and an outer layer outside the shield layer on which the signal detection circuit is mounted.

Abstract: A repeater includes two connectors to each of which a communication cable is connected and a circuit board on which the two connectors are mounted and which includes a signal transmission section configured to connect corresponding ones of electrodes of the two connectors together, and the two connectors are mounted on different surfaces of the circuit board such that the communication cables are inserted in opposite insertion directions.

Abstract: A cable signal detector is configured to detect the presence or absence of information communication in a communication cable including a plurality of signal line pairs for differential signaling. The cable signal detector includes a plurality of detecting portions each of which is configured to partially branch and draw a transmission signal from a different signal line pair, rectify the branched and drawn signal into a direct current, and output that direct current, and a displaying portion configured to display the presence or absence of information communication, based on outputs of the plurality of detecting portions. The outputs of the plurality of detecting portions are connected in series, and the displaying portion is configured to display the presence or absence of information communication, based on an overall output voltage of the plurality of detecting portions connected in series.

Abstract: A cable signal detector for being provided at a connector at an end of a communication cable transmitting differential signals or at a relay connector to be connected to the connector to detect an existence of information communication. The cable signal detector includes an amplifier circuit that branches and extracts a portion of a signal transmitted through the communication cable, amplifies the extracted signal and outputs the amplified signal, and a display portion that display the existence of information communication based on the output of the amplifier circuit. The amplifier circuit is mounted on a detection device formed separately from the connector or the relay connector. The connector or the relay connector is configured to transmit the extracted signal to the detection device.

Abstract: A communication monitoring system includes a plurality of detecting portions each provided at a connector at an end of a communication cable or at a relay connector to be connected to the connector to branch, extract and output a portion of a signal transmitted through the communication cable, and a monitoring unit configured to monitor an existence of information communication through each of the communication cables provided with the detecting portions based on an output from the plurality of detecting portions.

Abstract: A crosstalk reduction method includes providing a signal transmission unit including first to eighth main transmission paths, the first and second paths, the third and sixth paths, the fourth and fifth paths and the seventh and eighth paths being respectively paired to transmit differential signals, providing a first coupling transmission path in the signal transmission unit, the first coupling transmission path being adapted to electrically couple the third main transmission path to the fifth and seventh main transmission paths that are located adjacent to the sixth main path, and providing a second coupling transmission path in the signal transmission unit, the second coupling transmission path being adapted to electrically couple the sixth main transmission path to the second and fourth main transmission path that are located adjacent to the third main transmission path.

Abstract: A repeater includes a plurality of input-side connectors and a plurality of output-side connectors corresponding to the input-side connectors that are configured such that communication cables connected to the input-side connectors are connected to other communication cables connected to the output-side connectors, and a detection indicating circuit provided between the input-side connectors and the corresponding output-side connectors. The detection indicating circuit includes a detection circuit branching, extracting and outputting a portion of signal transmitted between the input-side connectors and the corresponding output-side connectors, and an indicating circuit for indicating an establishment of information communication according to an output from the detection circuit.

Abstract: A communication visualization device includes a transformer for converting a magnetic field caused from a LAN cable connected to an information communication apparatus into electric energy at time of information communication, an amplifier circuit for amplifying the electric energy output from the transformer, a rectifier circuit for converting an amplified signal amplified by the amplifier circuit into a DC voltage, and a light-emitting circuit for emitting light when the DC voltage obtained by conversion of the rectifier circuit is supplied thereto.

Abstract: A communication visualization system includes a wireless power-feeding device for transmitting electromagnetic energy in a wireless manner and a communication visualization device for notifying that a LAN cable connected to an information communication apparatus is performing information communication. The communication visualization device includes an antenna part for receiving the electromagnetic energy transmitted from the wireless power-feeding device, a rectifier circuit for rectifying the electromagnetic energy received by the antenna part to generate a DC voltage, an amplifier circuit for amplifying a communication signal transferred to the communication cable at the time of information communication by using the DC voltage generated by the rectifier circuit as operation power, a rectifier circuit for converting the amplified communication signal into a DC voltage, and a light-emitting circuit for emitting light when the DC voltage after conversion is supplied.

Abstract: A cable signal detector includes a detection unit that is provided in a connector attached to an end of a communication cable or in a relay connector to be connected to the connector, and branches, extracts and sends a portion of signal transmitted through the cable, and a visualization unit that is provided separately from the connector or the relay connector and includes a light-emitting circuit to emit a light when receiving the signal sent from the detection unit.

Abstract: An antenna includes an antenna element to transmit or receive electromagnetic signals, and a ground conductor to be grounded. The antenna element includes two conductors arranged substantially parallel to each other, a power feed portion provided between one conductor of the two conductors and the ground conductor, and connected to a feed system, a shorting portion for electrically connecting an other conductor of the two conductors and the ground conductor, and a conductor connecting portion for electrically connecting the two conductors together. The distance between the two conductors is not more than 1/100 a wavelength equivalent to a minimum frequency of operating frequencies of the antenna.

Abstract: There is provided an antenna comprising: a ground conductor; and an antenna element portion for sending and receiving electromagnetic wave signals, the antenna element portion comprising: a coaxial cable including a center conductor and an outer conductor; a feeding point connected to a feeding system and disposed between the ground conductor and a first end of one of the center and outer conductors; a short-circuit portion electrically connecting the ground conductor and a first end of the other one of the center and outer conductors; and a conductor connection portion electrically connecting second ends of the center and outer conductors each other. In addition, an overall length of the coaxial cable is not more than ½ of a wavelength corresponding to the minimum series resonance frequency; and a distance between the center and outer conductors is not more than 1/100 of a wavelength corresponding to the minimum operation frequency.