In an IT infrastructure, there may be a large number of devices, which significantly increases the complexity and investment required for installation. PoE power supply is increasingly being used to reduce costs and complexity in many IT systems, thanks to its ability to transmit both data and electrical power through the same Ethernet cable.
Below, we will talk about this technology and its characteristics, how PoE works, and what the main benefits it offers are.
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What is PoE
Power over Ethernet, or PoE (Power over Ethernet), is a technology that allows the Ethernet cable to be used to transmit data and electrical power at the same time. It is a type of networking function defined in the IEEE 802.3af (PoE) and 802.3at (PoE+) standards, and it is commonly used to simplify the installation of networks and IT systems.
It is important to note that PoE is a widely used technology in business and industrial environments, but it also adapts to specific needs, where more and more connected devices are being used in home networks. PoE devices are usually classified into four categories, depending on the electrical power consumption they require:
- Category 1. Provides up to 15.4 watts of direct current.
- Category 2. Provides up to 30 watts of direct current.
- Category 3. Provides up to 60 watts of direct current.
- Category 4. Provides up to 100 watts of direct current.
What are the characteristics of PoE
The most notable characteristics that define this technology are:
- Ability to transmit data and power through the same Ethernet cable.
- Compliance with IEEE standards.
- Compatibility with traditional Ethernet networks.
- Use of Ethernet cables Cat 5e, Cat 6, Cat 6e and higher.
- Control of the supplied power.
- Ability to identify connected devices.
How PoE works
In a PoE installation, two main types of devices are used: one that acts as a power supply, which provides the electrical current, or PS (power source), and the different devices that receive that power, or PD (power device).
Typically, a PoE switch is used as the PSE, and a series of devices are connected to it to receive, through the Ethernet cable, both electrical power and data. These devices must natively support PoE; otherwise, it would be necessary to add a specific adapter so they can be implemented in the installation.
Each PS device in a PoE system has a defined power supply capacity, which is why proper prior design of the infrastructure requirements is essential in order to implement it correctly (number of devices to connect via PoE, their power consumption, etc.).
In an installation, it is possible to choose active PoE, where the PS and PD autonomously negotiate the required power, or passive PoE, where this negotiation process does not exist and the same voltage is always sent through the Ethernet cable connected to the PS.
Why use Power over Ethernet technology
There are many advantages to choosing PoE when designing and implementing an IT and communications infrastructure. The most notable ones are:
Simplified installation
One of the most interesting benefits of PoE technology is that it simplifies the design and implementation of an installation. Since there is no need to have power outlets available, the installation is simplified, reducing the time and effort required.
In addition, PoE provides greater versatility and flexibility when installing devices, as it does not depend on electrical power points.
A clear example of how PoE systems simplify installation can be seen in the use of IP cameras, where it is often difficult to have electrical outlets available in certain locations (such as ceilings). With PoE technology, it is only necessary to install an Ethernet cable for the cameras to operate efficiently, without the need to connect them to a traditional power source.
Reduce costs
Another advantage offered by PoE is the reduction of infrastructure costs. Since many power outlets are no longer required, associated costs are reduced, which can otherwise become quite high (power cables, connectors and plugs, cable trays, etc.).
Depending on the size of the installation, using PoE can provide significant savings. In addition, the price difference between PoE-compatible devices and those that are not is minimal.
Provide greater convenience
With PoE technology, cabling is significantly reduced, which greatly eases the distribution and use of devices. In today’s digital and technological environments, using a technology that reduces the number of cables is a major convenience across all sectors.
For example, in hospital environments—where the number of electrical devices is high—PoE stands out as one of the best alternatives to minimize cabling and provide a safer and more comfortable environment.
High level of quality and performance
IT and communication infrastructures that incorporate PoE technology guarantee a high level of performance, since using the same cable to transmit data and power does not reduce capacity or quality.
It is important to highlight that PoE is a technology that complies with internationally accepted electrical safety standards, making it safe to use in any type of environment (it includes automatic disconnection functions in the event of voltage surges or short circuits).
PoE power delivery offers multiple advantages when designing and implementing a networked IT system, especially by simplifying installation, as it eliminates the need for a power outlet for many devices.
At Advantencia, we are specialists in hospital communication and assistance systems, and we help you get the most out of technologies such as PoE. Don’t hesitate to contact us to receive a personalized service tailored to your specific needs.
