Power-over-Ethernet (PoE) and USB power delivery (PD) systems are quite different in terms of the required power controllers. Still, they are very similar in terms of output power requirements. While PoE typically uses 48 Vdc input power for local power converters, USB PD power adapters typically operate from AC mains voltages. However various PoE and […]
Power over Ethernet
Magnetics for Power over Ethernet
Power-over-Ethernet (PoE) delivers power to remote powered devices (PDs) over twisted-pair Ethernet cables up to 100 meters long. Over time, the standard has evolved and can now deliver up to 71W, making it useful for a wide variety of applications, including network routers and repeaters, VoIP phones, IP security cameras, wireless and Bluetooth access points, […]
How does Cat 5e cable handle Hi PoE?
Look at just about any kind of network connection today and you’ll find Cat 5e cable. It’s been the most widely used network cable since 2001 and handles signals up to 100 MHz. So you find Cat 5e handling 10BASE-T, 100BASE-TX, and 1000BASE-T Ethernet networks. But the actual power levels that Cat 5e sees when […]
Surface mount transformers for Power-Over-Ethernet applications
Signal Transformer announces the latest product innovation for Power Over Ethernet (PoE) applications, the SPoE Surface Mount Transformer Series. SPoE is a new product for equipment or devices connecting to an Ethernet or enterprise network and relies on ethernet cables to receive power and digital data signals for operation and processing, respectively. Today’s IoT (Internet of […]
Design considerations for PoE
by Rich Fry, Director ICT, TDK Corporation of America The adoption of Power over Ethernet (PoE) in various applications is growing significantly, largely due to the added benefit it can provide for both the designer and end users: Fewer cords at workstations lower labor costs, and the ability to run an Ethernet LAN cable that […]
DoE Level VI efficient mini PoE injector handles multi-GB transmission rates
Phihong has expanded its IEEE802.3at compliant POEA30U-1AT Power-over-Ethernet mini PoE injector with new models that deliver 2.5G, 5G, and 10G transmission rates to support customers that require increased data speeds. The multi-gig support models feature shielded RJ45 jacks to provide better immunity to noise and reduced cross-talk. Phihong’s POEA30U-1AT Series injectors are ideal for use […]
Eight-port PoE switch provides 60 W per port
The adoption of commercial smart lighting systems has grown significantly as organizations strive to improve energy efficiency and operational costs in buildings. Power over Ethernet (PoE) is rising in popularity for these systems, providing a reliable and easy-to-install solution that manages power and data over a single Ethernet cable. To support larger and more efficient […]
PoE tester checks four wire pairs
PoE Texas has released the PoE Tester Gen2, a major redesign to their inline voltage and current tester for Power over Ethernet. In approaching the redesign, the PoE Texas team worked hard to incorporate the details customers loved about the original PoE Tester while making the device smaller, simpler, and smarter. The new tester’s ability to automatically test […]
Advances in Power over Ethernet ICs
Power-over-Ethernet specs have changed over the years — PoE devices have gotten more powerful, and so Ethernet cables are starting to become more like a power line. Silicon Labs’ John Wilson recently did a short video with us about four new power device ICs built with higher PoE power levels in mind. John reviewed demonstrations […]
