An AC power supply apparatus used for an AC load of a high voltage such as a cold cathode tube. A polymer resin is blended with a silicon-based barrier control agent, preferably a polyhedral oligomeric silsesquioxane, to increase the permeability of the sausage casing. The system then uses the section of the content map to determine the location of the section of the item of content. The global VLAN identifier represents a layer-2 forwarding domain in the network and is distinct from a customer VLAN or a service-provider VLAN. A holder is formed on the filter support face. The control valve has a substantially hollow-cylindrical valve box, a control piston and a securing ring.