The BWPOE Injector is an advanced 802.3af compliant device with Midspan Intelligent Detection. The device does not turn on power until it detects a valid POE signature from the devices attached downstream on the Ethernet cable. This protects against damage to non-compliant equipment which may be connected to the Ethernet cable. Because of this intelligent detection only an 802.3af compliant device can be powered with the BWPOE Injector. Because of its 48V inserter, the installer doesn t need to worry about voltage drops due to cable length. Typically in 100MB networks the maximum allowable CAT5 cable run is about 100 meters. This is not a limitation of the POE equipment but rather a limitation of the Ethernet standards. The BWPOE Injector is not a proprietary unit. It will function with any equipment which is fully compliant with the IEEE 802.3af POE standards. Note: The equipment being powered must be fully 802.3af compliant in order for the power supply to be able to sense the devices signature and apply power. Power is supplied on ethernet pins 4/5 (V+) and 7/8 (GND).