The -NC version is a passive PoE model for devices which are not 802.3af/at compliant.
On the -NC version the PoE output voltage = the input voltage so it is universal in its application. The DC input power range can be from 12V to 57V. The units can be powered via 2 or 4 pair PoE to port 8 (2A max). TP-SW8- D has a 2 channel 802.3at input for 70W max PoE input. Both models supply power to the remote device on the unused Ethernet pins 4,5(V+) and 7,8(V-). The Ethernet spec supports distances up to 100m (328 feet) between the PoE switch and the remote device.
Wireless Access Points and Client Devices
IP Phone and Security Camera Systems
Power multiple devices from 1 data cable
Ethernet Standard IEEE802.3/IEEE802.3u (10 base-T/100base-T)
POE Standard (Port 1-8) Passive POE 12-57VDC
Ports One data/PoE input and seven data/PoE outputs automatic crossover and polarity