Ethernet-to-analog controller

[Subject] It is the system and method of permitting communication with the [solution means] Ethernet network 16 and Hazama with the non-Ethernet equipment 12. It permits changing further, in order to permit that the Ethernet versus analog adapter 10 changes an analog signal for Ethernet communication and to carry out analog communication of the Ethernet signal to the analog device 12. An Ethernet versus analog adapter permits adopting the Power over Ethernet (PoE) and supplying electric power to an analog device while supervising the analog device which managed electric power and was attached. The battery 14 to which the highest electric power required quantity of the attached analog device is satisfied and in which re-charge is possible can be offered.