A wafer carrier opener is provided. A control device controls the pump which a conduit interconnects to the wellbore. Since the reverse link has a higher user capacity than a forward link, the reverse link speech coder can operate with a higher average data rate. A multiplexer is coupled to the processor-specific resource, and is controlled to read data based on the identification. The dilator is inserted in the through hole of the trocar. A ratio of the current data transfer rate to the maximum data transfer rate may be evaluated with respect to a threshold.