Abstract: The frame disassembly unit receives the MAC frame to insert/identify a destination address and tag. The information retrieval unit retrieves the VLAN information DB to discover the tag and port which correspond to the destination address. The type determination unit determines whether the MAC frame received is unicast, multicast or broadcast. The unicast transmission control unit controls the switching device so as to transmit the MAC frame to the communication node of the destination. The multicast transmission control unit controls the switching device so as to confine within a VLAN to transmit the MAC frame by multicast or broadcast.

Abstract: Interconnect of communication between mobile objects by another mobile object is enabled. Station A transmits its own identifier to another mobile station on a broadcast basis. Out of other mobile stations, Station B receives the identifier of Station A, and returns a response including its own identifier. Station A notifies Station B of identifiers of nodes with which it can communicate. Station B notifies Station A of identifiers of nodes with which it can communicate. This sequence of processing enables information on nodes with which either station can communicate to be exchanged between Stations A and B, and a communication path to nodes to be found between Station B (station A) and another node via Station A (station B).

Abstract: When there is an arrival of a multicast call at a VoIP terminal on a call reception side, an SLIC sends out a ringing signal to a loudspeaker IF. The loudspeaker IF, after receiving the ringing signal, enters into a state in which voice is outputted from a loudspeaker even if a user does not respond. Compressed voice data is taken out of an IP packet received from a network and extended by a DSP to become voice data. Further, the voice data is converted by a CODEC into a voice signal, which is outputted from the loudspeaker.

Abstract: A secure entry system for a building having a plurality of units provided therein, each of the units permitting only entry of a designated person thereto, the system comprising: an administration server operable to administrate a computer network system in the building; and at least one interconnecting device operable to connect the administration server and respective network devices in the plurality of units. The administration server sets the interconnecting device to assign a plurality of VLANs to each of the units, respectively, in such a manner that a VLAN assigned to one of the units is different from VLANs assigned to respective others of the units to provide secure entry to the units and the computer network system in the building.

Abstract: A network concentrator is mounted on a mounting surface using a mounting piece. The network concentrator includes a mounting hole in a mounting part. If the mounting surface is not magnetic, a protrusion such as a screw is inserted into the mounting hole. If the mounting surface is magnetic, a mounting piece is used. The mounting piece has such a form as to be inserted into the mounting hole, and is provided with a magnet. The magnet is attached to the mounting surface, and a part of the mounting piece is inserted into the mounting hole to mount the network concentrator on the mounting surface.

Abstract: A network including a plurality of interconnecting devices, each of which interconnects communication between two transmission media and has a disconnect function for disconnecting communication to one transmission medium in a case where communication from the other transmission medium has been disconnected, is managed by storing interconnecting device information that identifies one or more of the interconnecting devices having a disconnection release function for releasing operation of the disconnect function.

Abstract: There is provided an accommodation apparatus for a transmission medium, such as an optical fiber cable which includes a housing for accommodating the transmission medium and an arrangement part located in the housing, said arrangement part arranging an orientation of the transmission medium accommodated in the housing so as to prevent the transmission capability of the transmission medium from getting damaged. The arrangement part may include downwardly extending L-shaped posts 116 about which the cable 10 may be wound in a space enclosed by a bottom cover 130. The housing top side 110A is to support an optical to electrical media converter 200 and includes a raised part 114 with an opening 118a for receiving a projecting port 214 of the media connector.

Abstract: An administrative system provided with surveillance equipment, which is arranged in a plurality of locations on a patrol surveillance route, for (1) reading identification information stored in an information storage medium carried by surveillance staff, and (2) transmitting the identification information. The system is also provided with management devices for (1) receiving the identification information transmitted by the surveillance equipment and (2) storing the identification information in relation to identification information that identifies the surveillance equipment.

Abstract: A network concentrator is mounted on a mounting surface using a mounting piece. The network concentrator 1 is given a mounting hole in a mounting part. If the mounting surface is not magnetic, a protrusion such as a screw provided on the mounting surface is inserted into the mounting hole. If the mounting surface is magnetic, on the other hand, a mounting piece is used. The mounting piece has such a form as to be inserted into the mounting hole, and is provided with a magnet. The magnet is attached to the mounting surface, and a part of the mounting piece is inserted into the mounting hole, thereby mounting the network concentrator on the mounting surface.

Abstract: When an IC card 1 is inserted into an IC card reader 2 of an emergency notification box 101, the name and so on of an aged person are read to be inputted to a controlling section 4, and this information is sent out as an emergency notification signal from a communication section 6 by a controlling section 4 via a public telephone line 7 to a receiving device 102 of a place to be contacted which is stored in advance. In the receiving section 102, the name and so on of an aged person is outputted from a speaker 12, and furthermore, a warning light 13 is lighted and a vibrator 14 is vibrated to notify an emergency.

Abstract: A routing device interconnects a client and a first DNS server resolving a virtual domain name on a local network or a second DNS server resolving an actual domain name on the internet. The routing device has a DNS server designation section designating the first DNS server if an inputted domain name matches a virtual domain name stored in relation to an IP address of the first DNS server, and designating the second DNS server if it does not.

Abstract: A management system is provided with a sensor control means located in each region of a multiple occupancy building and a management apparatus connected to and able to communicate with the sensor control means. The sensor control means are connected with sensors for detecting the state in each area and send to the management apparatus detection information output by the sensors along with mounting location information of the sensors. Also, the management apparatus correlates and manages the detection information and mounting location information received from the sensor control means.

Abstract: The optical wireless communication device 1 is provided with a transmitting unit 102 outputting a light such as a laser light for optical communication. Beside the transmitting unit 102, the optical wireless communication device 1 is also provided with a laser pointer 24 emitting a light for optical axis adjustment. Further, the front surface of the optical wireless communication device 1 has a sight 401 where a light for an optical axis adjustment irradiates to allow proper adjustment of an optical axis. The optical wireless communication device 1 allows optical axis adjustment to be quick and easy in the configuration where a position of a device of one side is adjusted for an optical axis alignment with the device of the other side by checking the lighting of the LED 22 in the other side.

Abstract: A semiconductor device malfunction preventive circuit S is disposed in a macrocell logic cell 1 of a semiconductor device 50 used in an electronic device 100. A signal in an output pin 3 or in a signal line 6 is returned to the semiconductor device malfunction preventive circuit S as a pin feedback and monitored. When a predetermined state is detected, an abnormality detecting signal SIGAB for resetting the operation of the electronic device 100 is outputted.

Abstract: A management system is provided with a sensor control means located in each region of a multiple occupancy building and a management apparatus connected to and able to communicate with the sensor control means. The sensor control means are connected with sensors for detecting the state in each area and send to the management apparatus detection information output by the sensors along with mounting location information of the sensors. Also, the management apparatus correlates and manages the detection information and mounting location information received from the sensor control means.

Abstract: An administrative system is provided with surveillance means, provided in a plurality of locations on a patrol surveillance route, for reading first identification information that is stored in an information storage medium carried by the surveillance staff, and for transmitting this first identification information. The system is also provided with management means for receiving the first identification information transmitted by the surveillance means and storing this first identification information in relation to second identification information that identifies the surveillance means.