Abstract: A modular plug attaching and detaching tool includes a first holder configured to accommodate a plurality of modular plugs in an aligned state and a second holder configured to press unlocking claws of the plurality of modular plugs when the second holder is attached to the first holder. The first holder includes an engagement groove extending in an inserting direction of the modular plug. The second holder includes an engagement part configured to engage with the engagement groove of the first holder by being moved in the inserting direction.

Abstract: A modular plug attaching and detaching tool includes a first holder configured to accommodate a plurality of modular plugs in an aligned state and a second holder configured to press unlocking claws of the plurality of modular plugs when the second holder is attached to the first holder. The first holder includes an engagement groove extending in an inserting direction of the modular plug. The second holder includes an engagement part configured to engage with the engagement groove of the first holder by being moved in the inserting direction.

Abstract: An modular plug includes a plug main body that can be inserted into and removed from a connector; an engaging claw configured to engage the plug main body with the connector; and an operations lever configured to turn off engagement of the plug main body and the connector by the engaging claw; wherein a lock turning-off member is provided at the plug main body so that the lock turning-off member can be slid in inserting and removing directions; an inclination surface of the lock turning-off member is formed in a position facing the operations lever; and the inclination surface operates the operation lever accompanying sliding in the inserting direction of the lock-turning off member so that the engagement of the engaging claw and the connector is turned off.

Abstract: An modular plug includes a plug main body that can be inserted into and removed from a connector; an engaging claw configured to engage the plug main body with the connector; and an operations lever configured to turn off engagement of the plug main body and the connector by the engaging claw; wherein a lock turning-off member is provided at the plug main body so that the lock turning-off member can be slid in inserting and removing directions; an inclination surface of the lock turning-off member is formed in a position facing the operations lever; and the inclination surface operates the operation lever accompanying sliding in the inserting direction of the lock-turning off member so that the engagement of the engaging claw and the connector is turned off.

Abstract: A power supply terminal that prevents damage to capacitors included in a noise filter circuit therein which may occur due to a BWB's warp or thermal stresses at soldering time. The noise filter circuit is formed on a noise filter circuit substrate, being a substrate separate from the BWB. The noise filter circuit substrate is connected conductively to part of each of press fit terminals.

Abstract: An electronic apparatus includes an optical connector adapting unit to which optical connectors of external optical fibers are connected. The optical connector adapting unit includes a plurality of optical connector adapters which are diagonally arranged on the front side of the apparatus. The optical connectors of the external optical fibers are diagonally detachable from the optical connector adapters. In this electronic apparatus, a large number of optical connectors of optical fibers can be connected and arranged in a restricted space.

Abstract: A power supply terminal that prevents damage to capacitors included in a noise filter circuit therein which may occur due to a BWB's warp or thermal stresses at soldering time. The noise filter circuit is formed on a noise filter circuit substrate, being a substrate separate from the BWB. The noise filter circuit substrate is connected conductively to part of each of press fit terminals.

Abstract: There is provided a circuit board cabinet which is capable of more reliably preventing flames of a fire in a shelf from spreading to external devices, without degrading cooling capability thereof. Flames of the fire occurring in the shelf rise within a slot, pass through a shield plate, and then enter a heat shield unit. In the heat shield unit, the flames are first blocked by a heat shield plate and substantially reduced in force while passing through holes formed through the heat shield plate. Portions of the flames which were not blocked by the heat shield plate reach a top board of the unit after passing through the holes, where they are reduced. Since there is a predetermined distance between the heat shield plate and the top board, the flames having passed through the heat shield plate spread horizontally to some extent and then reach the top board. Therefore, it is possible to reduce the force of the flames sufficiently by the top board.

Abstract: A power supply terminal assembly for use on a board and having a construction which is capable of improving working efficiency in mounting the power supply terminal assembly onto the board and enhancing mechanical strength of each power supply terminal. The power supply terminal assembly for supplying electric power to a back wiring board (BWB) comprises a terminal block formed with a pair of through slits and a screw hole at a center between the pair of through slits, and a terminal bracket bent into a U-shape and having a flat central plate portion formed therethrough with a hole corresponding to the screw hole and opposite side plate portions each formed with a plurality of press-fit terminals at an end thereof, the opposite side plate portions being inserted through the pair of through slits, respectively, and fixed thereat.

Abstract: An optical telecommunication apparatus includes a shelf, a primary substrate provided in the shelf, a secondary substrate provided on the primary substrate, an optical component provided on the secondary substrate, and an optical connector provided on the secondary substrate for connection with an external optical cable, wherein the secondary substrate is pivoted on the primary substrate about a pivot axis so as to be movable about the pivot axis between a first position in which the secondary substrate is inside said shelf and a second position in which the secondary substrate projects outside of the shelf. The secondary substrate is in electrical connection with the primary substrate while in any position between the first and second positions.

Abstract: A communication apparatus is provided which permits system configuration to be freely changed even after electronic circuit boards are mounted to a shelf. The apparatus is a combination of an open rack and a shelf mounted on the rack, office cables for interconnecting external electronic devices are guided toward the rear of the apparatus and connected directly to external connectors of the electronic circuit boards, and a back wiring board is arranged on the rear surface of the shelf and has sheet connectors to which power supply connectors of the electronic circuit boards are connected.

Abstract: A communication apparatus is provided which permits system configuration to be freely changed even after electronic circuit boards are mounted to a shelf. The apparatus is a combination of an open rack and a shelf mounted on the rack, office cables for interconnecting external electronic devices are guided toward the rear of the apparatus and connected directly to external connectors of the electronic circuit boards, and a back wiring board is arranged on the rear surface of the shelf and has sheet connectors to which power supply connectors of the electronic circuit boards are connected.

Abstract: An optical fiber cable lead-in structure for a shelf (1) having a space (7) for receiving a remaining portion of the optical fiber cable (23), and an electronic circuit unit (12) mounted thereon having a board (14) and a surface plate (15) provided perpendicularly at one side of the board (14); the surface plate (15) covering the front side of the shelf (1) when mounting, comprising: an optical connection (21;25) for connection between the optical fiber cable (23) and the electronic circuit unit (12), which is provided on the board (14) adjacent to the backside of the surface plate (15); an outwardly protruding portion (33) that is provided in the surface plate (15) so as to correspond to the optical connection (21;25), such that an attaching and detaching operation of the optical connection (21;25) may be easily effected; and an opening (27) that is provided in the surface plate (15) such that the optical fiber cable (23) extending from the remaining fiber cable receiving space (7) is wired so as to extend a