| 摘要 |
A shelf for receiving a plurality of electronic circuit boards, the electronic circuit boards having a structure where a connecter installing part is provided at a front end part of each of the boards and an optical transmitting and receiving element for optical communications between two or more of the electronic circuit boards is provided at a rear end part of each of the boards, includes a plurality of connectors arranged on a backboard of the shelf, the shelf having a right hexahedral-shaped configuration, the connectors detachably supporting the connecter installing parts of the electronic circuit boards; and a bonnet attached to a front surface opening part of the shelf so as to form a closed space, the bonnet having a mirror surface situated at a rear surface of the bonnet so that an optical communication signal being received and transmitted between two or more of the electronic circuit boards is reflected.
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