When it comes to outdoor surveillance applications or those covering large areas, such as wide-open factory sites, large-scale production lines, main intersections and outdoor parking lots, the installation of a surveillance system is always more challenging than indoor implementation because of a shortage of power supply, and unpredictable weather and lighting conditions. Particularly, a constant and stable power supply is always the first issue during system implementation. Installers usually have no choice but to adopt additional and excessive hardware such as PoE switches, extenders, injectors or splitters in order to ease power deployment and provide reliable power and therefore consistent surveillance.