Patent ID: 8870471

Claim:
A receptacle cage used in a receptacle assembly to be mounted on a wiring board in a housing of a communication system, comprising: a module accommodating portion made of a metal and configured to detachably accommodate an optical module, the module accommodating portion having a module slot provided at one end to allow passage of the optical module, and a bottom wall portion coming in contact with a lower surface of the optical module; a connector accommodating portion made of a metal, the connector accommodating portion communicating with the module accommodating portion and having a connector cover made of a metal and configured to shield a connector to which the optical module is connected; a first shield member provided on an entire periphery of the module slot and configured to come into contact with the optical module and to shield electromagnetic noise generated in the module accommodating portion so as to avoid radiation of the noise into the housing; a second shield member provided in a region corresponding to a boundary portion between the connector accommodating portion and the module accommodating portion and at the periphery of a slot for the connector cover for the connector accommodating portion, and configured to come into contact with the optical module and to shield the electromagnetic noise generated in the connector accommodating portion; and third shield members provided in regions being different from a region where the second shield member is provided, and between the connector accommodating portion and the wiring board, the third shield members configured to shield the electromagnetic noise generated in the connector accommodating portion.