A keel is provided having a spring portion and a connecting portion. By doing so, the rotation of a toner container is stopped at a position where a toner exit is above the boundary surface of toner. The scan lines, data lines, pixel units, and connecting lines are all disposed over the substrate. In some embodiments, the determination as to when to allocate additional time to an antenna may be based upon whether or not a transponder is currently in the coverage zone for the antenna. A SONET frame can be divided into several multicast packets that are dispersed to different random nodes before replication, thus dispersing congestion. For all candidate frequency offsets, difference values are compared with each other.