A timing method and communication apparatus therefor. A height detector optically detects a surface height of the specimen by irradiating light from outside of the vacuum chamber onto the specimen and detecting reflected light from the specimen with a detector disposed outside of the vacuum chamber. Further, four decorative moldings and four junction pieces of metal, plastic, synthetics, or wood, interfit with the mounting member in a configuration with the moldings being slide locked into place and the junction pieces securing the decorative moldings in place. The one of the switches may receive data, associated with the second timeslot, on the one of the ingress links, identify the first timeslot and the one of the egress links, associated with the second timeslot and the one of the ingress links, based on the mapping information, and output the data, during the first timeslot, on the one of the egress links. The present disclosure also relates to an optical element. The assignment engine also assigns the at least one electronic resource to the target subject.