Abstract: A media converter monitors whether a metal cable link is disconnected. If the metal cable link is disconnected, a desired invalid code other than pre-defined codes is successively transmitted toward a fiber optic cable to disconnect its link. If the metal cable link is not disconnected, a first auto negotiation is performed with the metal cable side to set a first line ability, and a second auto negotiation is performed with the fiber optic cable side based on the first line ability to set a second line ability. Subsequently, a third auto negotiation is performed again with the metal cable side based on the second line ability to finally determine the line ability between the metal and the fiber optic cables.

Abstract: An attachment mechanism for attaching to a wall a network device for assisting a communication device in communicating on a network includes a heat radiation member, engaged with and supporting a housing of the network device, for radiating heat from the network device, and an attachment member, engaged with the heat radiation member, for attaching to the wall the heat radiation member engaged with the housing.

Abstract: There is provided a concentrator and a reset control method therefor that may easily and reliably secure early restoration from an outage of network communications. A concentrator to which a plurality of network devices are connectible includes a communication control part for controlling a transfer process of information among the network devices, a condition determination part for determining whether information obtained from the communication control part satisfies a reset condition, and a reset control part for controlling a reset signal used to reset the communication control part based on a determination by the condition determination part.

Abstract: It is an exemplified object of the present invention to provide a media converter so shaped that it may prevent damages and disconnections of an optical fiber cable and facilitates handling of the cable. A media converter of one aspect of the invention includes a converter part, connected to a first medium and an optical fiber cable as a second medium, for converting a signal between the first and second media, and an accommodation part for accommodating the optical fiber cable while maintaining a predetermined curvature.

Abstract: A media converter allowing a test mode to be activated from cable side and allowing easy detection of a failure and failure location is disclosed. A media converter includes first and second physical-layer interfaces and a memory connected between the first and second physical-layer interfaces to temporarily storing received data. When a trigger signal has been received at one of the first and second physical-layer interfaces, a response signal to the trigger signal is sent from a corresponding physical-layer interface back to a source that transmitted the trigger signal. The trigger signal is one of a specified modulation link signal and a packet having an illegal length that is not permitted in a network to which the media converter belongs.

Abstract: An accommodation apparatus facilitates the attachment, exchange, operation, and wire configuration of a plurality of communication devices, such as a media converter, and a power unit. The accommodation apparatus comprises a support part fixed to an external frame, and a loading part, movable relative to the support part. The loading part removably accommodates the communication devices, and includes a first surface and a second surface, wherein the transmission medium can be connected to the communication devices through the first and second surfaces.

Abstract: It is an exemplified object of the present invention to provide a media converter so shaped that it may prevent damages and disconnections of an optical fiber cable and facilitates handling of the cable. A media converter of one aspect of the invention includes a converter part, connected to a first medium and an optical fiber cable as a second medium, for converting a signal between the first and second media, and an accommodation part for accommodating the optical fiber cable while maintaining a predetermined curvature.

Abstract: A user identification device for identifying the user of a user terminal that communicated on the Internet, includes a first communication information acquisition section for acquiring first communication information indicating a correspondence between physical ports and MAC addresses from intelligent hubs, a second communication information acquisition section for acquiring second communication information indicating a correspondence between the MAC addresses and private IP addresses from routers, a third communication information acquisition section for acquiring third communication information indicating a correspondence between the private IP addresses and global IP addresses from routers, and a port detector for detecting a physical port connected to a user terminal that communicated using a designated global IP address.

Abstract: An attachment mechanism for attaching a network device to an object at a certain angle with respect to a horizontal direction, the network device being connectible to a cable connected to a communication apparatus, and the network device assisting a communication on a network by the communication apparatus includes a support part for supporting a housing of the network device, an accommodation part for accommodating the cable, and an engagement part connectible to the object.

Abstract: A data conversion technique allows efficient processing of fixed-length data even when a remainder is produced by dividing the variable-length by a predetermined fixed length. A remainder data length is produced by dividing variable-length data in units of a predetermined fixed length and an added data length is determined by subtracting the remainder data length from the predetermined fixed length. By adding addition data including the remainder data length to the variable-length data, data allowing fixed-length processing is obtained.

Abstract: A management system for managing a facility that is available to users includes a network provided in the facility and connectible to a terminal, a communication part for communicating with the terminal through the network, a first memory for storing first information on an availability and status of use of the facility and service associated with the facility, the first information being able to be updated, and a control part for allowing the user of the terminal to access first information.

Abstract: A management system includes a plurality of managed devices connected to a network and classified into one or more groups, each of which is given priority order, and a management device, connected to the network, for managing the plurality managed devices, the management device including a control part for differently managing said managed devices in accordance with the priority order.

Abstract: There is provided an accommodation apparatus for a transmission medium, 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 a transmission capability of the transmission medium from getting damaged.