Power over Ethernet, also known as PoE, is a standard in which power is transferred via Ethernet cable. This cable is a twisted pair which allows the connection of both data and power, and is usually in the format of an RJ-45 cable. Power over Ethernet allows straight forward installation of network devices as it provides both the power and data connection in one.
PoE devices are designed to sit within a circuit and help to inject or extract power into Ethernet data lines. They provide protection to the system, such as overcurrent and under-powering. PoE applications are also very easy to install, therefore minimising the risk of error.
Power over Ethernet ICs come in a standard semiconductor package, such as a QFN or SOIC.
What are PoE standards?
Power over Ethernet uses IEEE standards which enable interoperability between PoE-compatible devices and software. PoE uses the IEEE 802.3af and IEEE 802.3at (PoE+) standards.
Types of Power over Ethernet IC:
- PoE PD (powered device)
- PoE PSE (power sourcing equipment)
Where are PoE devices used?
Power over Ethernet can be found in applications which require connection to a network and to a power source. They are commonly used in PoE mid-spans, switches and injectors. These are found in telecommunications, IP cameras, IP TVs, network routers and intelligent lighting.
