The required refresh rate of a DRAM is reduced by biasing active digit lines to a slight positive voltage to reduce the sub threshold current leakage of access transistors in memory cells that are not being accessed. Information that the system used to create the work ticket, such as data files for lens materials and machine settings for controlling lens manufacturing equipment, are stored. Hybrid signal processing techniques allow fault-tolerant extreme temperature sensing. Based on the ICMP message, a status failure message is sent to the originating UE indicating failure of the call.