Abstract: A Power over Ethernet (PoE) power sourcing equipment that optimizes power supplied to a PoE powered device connected to one of a plurality of power supplying ports of the PoE equipment. The Power over Ethernet (PoE) power sourcing equipment includes a plurality of power supplying ports, a consumed power monitoring unit that monitors the consumed power of the PoE powered device connected to one of the plurality of power supplying ports, and a supply power determining unit that determines the set supply power to the PoE powered device connected to the one of the power supplying ports.

Abstract: The router device acquires detected temperature T from a thermistor provided inside the battery box containing secondary battery that provide the power supply, and if the detected temperature T is not smaller than a threshold value Th1, produces flashing display of an LED to alert the user. If the detected temperature T is not smaller than a threshold value Th2 additionally, supply of power to the CPU of the router device is subsequently interrupted. In this way, in a router device powered by a secondary battery, diminished functionality of the secondary battery due to elevated temperature may be prevented.

Abstract: The router device is able to use either battery power or a commercial power supply, and when using battery power detects battery voltage and indicates the level of battery voltage with an LED. When the router device is using battery power, writing of the firmware is disabled. Further, writing of settings information write is disabled when battery voltage goes below a second threshold value; and supply of power to the CPU is subsequently interrupted when battery voltage goes below a first threshold value. In this way the router device of the invention avoids problems occurring due to a drop in battery voltage when using battery power.