People commonly ask how far they can run Power over Ethernet. The answer is 100 meters from the PoE switch or hub to the PoE dependent device, regardless of where the power is injected. The limitation is not the power; it’s the Ethernet cabling standards that limit the total length of cabling to 100 meters.
There are however some devices that will allow PoE to be provided to a device over the 100m limitation.
Videplus’ PoE switches can provide PoE up the 250m which CCTV mode is turned on
The UNV range of NVR units can provide PoE up to 300m when Extended Transmission is enabled. To enable Extended Transmission, open up the Main Menu, click Camera, select the camera you wish to enable Extended Transmission with, click Configure and finally Tick the Extended Transmission box and save.
Finally Videplus’ VP-EO2C-POE Single Port PoE Ethernet Extender is a high-speed Ethernet transmission device. It can transmit Ethernet and Power signals together for PoE devices. It transmits data network signals up to 1000 metres over any pair of copper conductors, such as CAT5e, CAT6, coaxial cable.