A system and method for correcting errors and losses occurring during a receiver-driven layered multicast of real-time media over a heterogeneous packet network such as the Internet. The structure comprises a reading circuit, which includes a first transistor and a second transistor. A ready state display unit for displaying the ready information is provided. The combination of layers is connected to the packing system in such a way that the coating layer faces the sealing film. The switch interconnect includes one PLL for each input interface which synchronizes to the serial input from that input interface, and one PLL for each output interface which synchronizes to the single frequency source once for all serial communication to the output interface. A second, lower wall opposite the upper wall defines a series of conduits therebetween, and also strengthens the panels and provides a finished appearance for the underside.