MikroTik GPER, Gigabit Passive Ethernet Repeater. The GPeR unit allows to extend Ethernet cable by additional hop ( 100 - 150 m to regular network devices, and up to 210 m to another GPeR unit) up to 1,500 m. Maximium allowed length of CAT6 Ethernet cable between GPeR and power source router is up to 100 m. Maximium allowed distance of CAT6 Ethernet cable between two GPeR devices is up to 210 m (depending on cable quality). PoE in 802.3af at. PoE input voltage 24-57 B. poE out 802.3af at. Voltage drop on the cable and on GPeR units needs to be taken into account when calculating PoE-in possibility, Više informacija na linku