What is Power over Ethernet (PoE) cable Solutions?
Power over Ethernet (POE) is a technology whereby a limited amount of electrical D.C. power is transmitted over the structured cabling whilst the cables simultaneously transmit data over the non-powered pairs .
In 2003 the Institute of Electrical and Electronics Engineer (IEEE) approved the first PoE standard (IEEE 802.af) which delivered 12.95Watts of DC power using 2 of the pairs within the 4 pair cable structure. Emerging applications demanded more power therefore in 2009 the IEEE delivered a new standard (IEEE 802.3at) which realized a 25Watt DC power delivery over 2 pairs within the cable structure. The new 25Watt PoE solution is sometimes designated as PoE+.
IEEE 802.3bt is being developed in anticipation of future applications such as Thin Clients, Building Automation including Security, Hospitality and Next Generation Wireless Access Points and LED Lighting (see Fig.3).
|Application||Power Range (W)|
|Wireless Access Point||35-40|
It is anticipated that during early 2017 the IEEE will standardize IEEE 802.3bt. This standard will introduce 2 new PoE applications which utilize all 4 pairs within the cable structure. For these new applications, power and data will simultaneously be transmitted along the cable channel. The two new 4 pair applications will be described as Type 3 and Type 4 and thus formalize the power delivery structure within LAN cabling (See Table 1).
|PoE Type||Pairs Employed||Power Delivered|
In developing PoE solutions for 100W applications the IEEE has remained cognizant of the fact that any solution has to be Energy Efficient.