The power by using the network transformer. The IP camera receives the data and power on the same twisted pairs and split The power will beĪdded to the data pair (12-36) and transmit with the network. Switch usually doesn’t use the spare pair to send the power. We mentioned at the beginning, there are 2 spare twisted pairs in the EthernetĬable which has been taken for the power. However, this switch can supply the power to the camera as well as network through single RJ45 cable. It becomes PoE switch, The PoE switch look no different from conventional switch. Technically it calls PSE (power supply equipment). In the typical PoE system, the power is located at the central together with the network switch.
We will come back to it a little bit later. This is one way to understand the PoE, but it is not complete picture. The power is injected to the those twisted pairs and send over to the IP camera. It leaves 2 spare pairs twisted which will be used to carry the power. Only 2 pairs are used for fast network (10/100mbps). How Power Over Ethernet work? There’s 4 twisted pairs in cat5e or cat6 Ethernet cable. It also meet NEC Class II and SELV regulations as the whole system uses 48V DC low voltage input. Using the PoE power system can save installation cost. It eliminates the extra power cord to the camera.
Power over Ethernet allows power and network transmit over single Ethernet cable. So the network is required for communicating. Same as all other electronic devices, IP cameras need power.
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