A method and apparatus to optimize class of service under multiple VCs with mixed reliable transfer and continuous transfer modes have been disclosed where outstanding packets to be processed is through a Retransmission Mapper with a VOQ read pointer realignment that can quickly optimize network traffic with multiple VCs and mixed RTCT modes. An uppermost of the plurality of semiconductor layers has a Zn concentration less than that of a lower semiconductor layer to suppress an oxygen vacancy due to plasma. The measuring device itself has a holder including circuit traces for a sensor system. The hot-pressed laminate is placed in a lens forming mold cavity, and a lens-forming resin which has been colored or of which light transmissivity has been adjusted to a desired transmissivity is injected into the cavity to thereby form a polarized lens. When the network is not congested, all \u201cheartbeat\u201d packets will be passed through the network.