A tubular has an exterior sealing element disposed in a recess. The system allows the server device to transmit externally acquired reproduction-destined data to specific client devices in a secure manner. The semiconductor memory device further includes an operation unit performing an operation on read data obtained by the read circuit according to operation assignment information applied through an address line to reduce memory access time when entering a modified read mode. The first filter splits and combines odd and even channels depending on the propagation direction of the optical signal.