What is Power over Ethernet (PoE)?

In the ever-evolving world of technology, Power over Ethernet (PoE) has emerged as a convenient and efficient way to power devices without the need for a separate power source.

How does PoE work?

Simply put, PoE is a technology that allows network cables to carry both data and power simultaneously. This means that devices such as security cameras, wireless access points, and VoIP phones can be powered directly from the Ethernet cable, eliminating the need for separate power sources.

Key to PoE is the PoE switch, a device that can transmit power over Ethernet cables. Unlike a regular switch that only transmits data, a PoE switch adds an additional layer of functionality, providing power to devices that support PoE. This means that a PoE switch can power devices and transmit data at the same time, making it an excellent choice for businesses and organizations that require a high level of efficiency and convenience.

Types of PoE switch.

PoE switches come in various sizes and configurations, with some offering more advanced features than others. For instance, some switches are managed, which means they allow for better control and customization of the network. Managed switches are ideal for large organizations that require more granular control over their networks.

On the other hand, unmanaged switches are simpler and more affordable, making them an excellent choice for small businesses or home users. Unmanaged switches typically provide basic functionality, such as plug-and-play installation and automatic configuration, making them easy to set up and use.

Regardless of the size or configuration, all PoE switches are designed to provide power over the Ethernet cable to devices that support PoE. These devices, known as powered devices (PDs), include IP cameras, wireless access points, VoIP phones, and more.

What are PoE modes?

Ethernet cables have 4 pairs of wires, and 2 of those pairs are used for transmitting data. PDs receive power over either:

• the data pairs - known as mode A
• the non-data pairs - known as mode B

PDs can still be powered in a network that does not have PoE switches using a device known as a power injector, which injects power into the Ethernet cable between the switch and PD.

What are the benefits of PoE?

The benefits of PoE are numerous. For starters, PoE eliminates the need for separate power sources, reducing clutter and simplifying installations. This can be particularly useful in situations where power outlets are scarce, such as in ceiling-mounted access points or security cameras.

In addition, PoE provides a high level of flexibility and scalability, allowing for easy additions and modifications to the network. PoE switches can power up to hundreds of devices, depending on the switch's capabilities, making it an ideal choice for large organizations that require a high level of connectivity.

Finally, PoE is a safe and efficient way to power devices. PoE switches are designed to provide power only when a device is connected, preventing accidental shocks and reducing energy waste. They also intelligently manage their power budget to maximize the number of supported PDs, and ensure critical devices continue to receive power, while less important devices do not in the event of reduced power availability. PoE is an environmentally friendly and cost-effective solution.

In conclusion.

Power over Ethernet is a convenient and efficient way to power up devices without the need for separate power sources. PoE switches are the backbone of PoE technology, providing power and data transmission simultaneously. Powered devices, including IP cameras, access points, and VoIP phones, benefit from PoE technology, making installations simpler and more efficient. The benefits of PoE are numerous, including reduced clutter, flexibility, scalability, safety, and energy efficiency, making it an excellent choice for businesses and organizations that require a high level of connectivity.

What does Allied Telesis offer?

We have a range of managed and unmanaged PoE switches, supplying up to 90 watts/port. We have the right solution to connect and power your devices everywhere from a busy office to smart buildings and cities.