Abstract: A wireless apparatus which can realize a DFS function that avoidance of interference with radar is considered in an Ad-Hoc mode under a multihop circumstance is provided. A Beacon frame is transmitted at a shorter interval than a previously set interval when radar is detected by wireless apparatuses N1 to N6 which have a DFS function which perform avoidance of interference with radar.

Abstract: The present invention is to allow prompt and reliable synchronization of belonging information management table even in environments where there is a possibility of receiving update notification information from a plurality of wireless base stations, without needing unnecessarily large traffic for synchronization of belonging information management table. Wireless base station stores belonging information management table, to which belonging information of a terminal belonging to the base station is associated with, to new/old judgment information for judgment of new/old of update. Belonging information update unit performs update of belonging information including the new/old judgment information thereof. Further, upon receiving update notification information from other wireless base station, the belonging information update unit updates the belonging information management table based on the update notification information.

Abstract: In wireless communication using links with neighbor wireless devices, a wireless device calculates ratios of throughput to maximum throughput for the links and calculates the costs of the links using the calculated ratios. Then the wireless device finds, for each destination, a route in which the sum of such calculated link costs is the minimum, and sends a packet to the destination using the route. As a consequence, routing can be done according to an isotonic, easy-to-implement routing protocol.

Abstract: When wireless communications are made between a first wireless device and a second wireless device along a route, two wireless devices which exist between the first and second wireless devices each determine the lowest maximum transmission rate (11 Mbps) in the wireless intervals on the route from themselves to the second wireless device to be their own transmission rate txRate (11 Mbps) and two other wireless devices which exist between the first and second wireless devices each determine the lowest maximum transmission rate (54 Mbps) in the wireless intervals on the route from themselves to the second wireless device to be their own transmission rate txRate (54 Mbps).

Abstract: An interference prediction apparatus capable of predicting a wireless channel in which channel interference occurs, measures a received signal strength for each wireless channel and predicts an interference area of the wireless channel in which channel interference occurs for each wireless channel on the basis of the received signal strength for each wireless channel.

Abstract: Disconnection of communication is prevented and a connecting relation is maintained between radio devices even when a communication channel is dynamically switched. Accordingly, when a first radio device switches a communication channel used for radio communication with a second radio device, the first radio device firstly switches to a simultaneously-connectable channel capable of a simultaneous communication with an original channel, and then switches to a destination channel.

Abstract: A communication quality measuring device measures communication quality for recognizing a communication state for a predetermined period. Then, the communication quality measuring device calculates a correlation period during which cases of communication quality measuring unit at a measured particular time. Then, the communication quality measuring device determines a communication quality result at the particular time based on correlation communication quality that is measured during the correlation period.

Abstract: A wireless communication system allocates resource information used in performing wireless communication to wireless base stations in order not to generate interference between access-side wireless interfaces and backbone-side wireless interfaces. Each of the wireless base stations includes an access-side wireless interface for covering wireless terminal devices and a backbone-side wireless interface for connecting the wireless base stations with each other. The wireless base station allocates resource information that is common to the wireless base stations to the backbone-side wireless interface that performs the wireless communication between the wireless base stations, and allocates resource information that does not generate interference with the backbone-side wireless interface to the access-side wireless interface.

Abstract: In a LAN relaying apparatus, a reception side control circuit receives a reception side write pointer from a reception side write control circuit and a reception side read pointer from a reception side read control circuit, and determines a reception side pointer difference between the side reception side write pointer and the reception side read pointer. Then, the control circuit controls the reception side read control circuit to start the second side read operation when the reception side pointer difference is equal to a reception side first threshold held therein. Subsequently, the reception side control circuit controls the reception side write control circuit and the reception side read control circuit such that the first side write operation or the second side read operation is carried out based on the reception side pointer difference, when the reception side pointer difference is not equal to the reception side first threshold after the start of the second side read operation.

Abstract: To provide synchronizing methods, optical switch modules, center devices, remote devices, optical access systems, optical access networks, programs, and recording media in the optical access network which can give the connection start time of the upstream optical switching element of the optical switch module. To the optical switch module, ranging functions are provided and the center device OLU carries out ranging of the optical switch module OSM as is the case of ranging of the remote device ONU. The center device OLU transmits the difference between roundtrip time of the remote device ONU and roundtrip time of optical switch module OSM, which is the result of these rangings, to the optical switch module OSM, and the optical switch module OSM can obtain the contact start time of the upstream optical switching element by calculating the contact start time using the difference.

Abstract: An input power stabilizing circuit, adapted to be disposed between a DC power source and a load to which DC power from the source is to be supplied. Voltage on a capacitor in the input power stabilizing circuit is prevented as much as possible from causing reverse current to flow when the DC power source develops a short circuit momentarily. A current detecting unit detects reverse current from the capacitor in an input power supply line, and a current interrupting unit interrupts a current line connecting the load with the DC power source. When reverse current flow is detected, the current line is interrupted by the current detecting unit and the current interrupting unit. The reverse current from the capacitor is held to a minimum value in the input power stabilizing circuit.

Abstract: A voltage clamp transistor 12 has a main current path (i.e., drain-source path or emitter-collector path) serially connected to the output terminal 9 of a drive IC 1, and also has a control electrode (i.e., gate or source) with a predetermined voltage applied thereto. An optical modulator 10 of a laser diode or the like is connected either directly or via an AC-coupled capacitor to the output side of the transistor 12.

Abstract: A multi-output switching power supply circuit easily produces multiple outputs with increased power source conversion efficiency. The circuit includes, in place of the rectifying diode and the commutating diode used in the multi-output switching power supply circuit of the prior art, a circuit configuration in which an NMOS for synchronous rectification is combined with a constant-voltage control by a magnetic amplifier. It is not required to use, for example, a radiator to dissipate heat, and hence the system size is reduced and the conversion efficiency is increased, and the system can be easily implemented in a low-voltage multi-output configuration. In a configuration in which a magnetic amplifier is arranged between a secondary winding and an first NMOS for synchronous rectification and a drive circuit for the first NMOS and an second NMOS for synchronous rectification is implemented as a separate winding other than the secondary winding, the first NMOS is not included in a loop to flow a reset current.