The evolution of industrial IT and OT architectures is seeing an ever-increasing convergence between information and operational systems, enabled by the adoption of common network protocols and infrastructures. In this context, Power over Ethernet technology plays a fundamental role, enabling the unification of power and data transmission on a single Ethernet backbone. However, to fully exploit the benefits of PoE, several key components are required, including PoE injectors and converters.
These devices perform complementary functions, enabling and optimizing the implementation of industrial PoE networks. PoE injectors are used to inject power into standard, non-PoE Ethernet cables, providing power to compatible devices. Converters, on the other hand, separate the power from the data signal, making it available to non-PoE-enabled devices. Injectors and converters are therefore essential elements for realizing the advantages of PoE: simplified cabling, flexible device placement, greater reliability, and reduced infrastructure costs. Before delving into their operation and applications in detail, it’s important to understand how these components fit into a modern industrial PoE network.
PoE Injectors and Converters: What They Are
PoE injectors and PoE converters are essential networking devices, as they allow devices to be supplied with power and data connectivity via Ethernet cables. The term PoE stands for Power over Ethernet and refers to the ability to transmit electrical energy along with data over an Ethernet cable. This makes it possible to power devices such as IP cameras, VoIP phones, WiFi access points, and other devices without having to provide dedicated electrical outlets.
A PoE injector is a device that is inserted inline onto an Ethernet cable and INJECTS electrical energy into the cable. Essentially, it transforms a standard Ethernet data cable into a PoE-enabled cable, providing power to a PoE-compatible device connected to the other end. The PoE injector draws power from an electrical outlet and injects it into the Ethernet cable along with the data. PoE converters, on the other hand, convert a PoE signal already present on the cable into a standard DC output, for example, to connect non-PoE-compatible devices. They therefore work in the opposite direction to injectors, extracting power from the Ethernet cable and making it available separately.
Both injectors and converters are key components in any PoE network implementation. They allow connectivity and power to be provided even where there are no electrical outlets, simplifying installation and wiring. Models are available with different PoE standards, power output, and number of ports. Correct selection and placement of these devices is essential for creating an efficient and functional PoE network.
PoE Injectors: All the Benefits in Industrial Networks
PoE injectors have become indispensable components in the design and implementation of modern industrial networks. Compared to traditional wired solutions, the adoption of Power over Ethernet technology offers a series of advantages that are important to fully understand. Before analyzing the individual benefits in detail, it is useful to briefly outline the operation and potential of PoE injectors. These devices are inserted inline onto the Ethernet cable and allow power to be “injected” along with the data signal.
This allows any PoE-compatible device, such as IP cameras, industrial sensors, or VoIP phones, to be powered directly through the network cable, without additional connections. PoE injectors are therefore a fundamental element in the development of IT/OT architectures that fully leverage the benefits of Power over Ethernet. The advantages of these devices include:
1.They simplify cabling, as they allow power and data to be carried over a single Ethernet cable. There is no need for separate conduits for power supply.
2.They reduce installation and maintenance costs by eliminating the need for dedicated electrical outlets near the devices to be powered.
3.They increase network flexibility and scalability, allowing PoE devices to be positioned wherever needed, without constraints related to the availability of power points.
4.They simplify the addition and removal of devices on the network. PoE-compatible devices can be quickly connected or disconnected, without affecting the electrical system.
5.They provide greater reliability, as critical devices are powered directly from the network and not from local wall outlets.
6.They increase security, thanks to the absence of additional electrical cables that can be damaged or tampered with.
7. They reduce clutter and aesthetic impact, eliminating multiple power cables.
8.They are compatible with the most common PoE standards (802.3af/at/bt) to meet the needs of various devices.
9.They provide adequate power (up to 90W) to power even energy-hungry devices such as PTZ cameras.
10. They facilitate the design and implementation of efficient and functional industrial networking systems.
Therefore, PoE injectors increase the performance, flexibility, and efficiency of industrial networks. Their adoption is essential for successful PoE implementations.
Converters and PoE Injectors: Practical Applications
As mentioned, injectors allow power to be injected into a standard Ethernet cable, switches manage and route the signal, while converters separate data and power for non-PoE-compliant devices. In practice, these devices are used for:
1.Powering IP cameras for video surveillance. Injectors allow data and power to be brought to the camera via a single Ethernet cable, simplifying installation and wiring.
2.Connecting VoIP phones and intercoms. VoIP devices can be positioned wherever needed without requiring proximity to electrical outlets.
3.Powering industrial WiFi access points. Access points can be installed in critical locations thanks to the absence of network and power cabling constraints.
4.Connecting IoT sensors. PoE-compatible sensors can be distributed throughout systems without additional power connections.
5.Connecting control and actuation devices. Drives, PLCs, and SCADA systems can be connected and powered via a single PoE infrastructure.
6.Powering industrial wireless repeaters. Injectors allow data and power to be delivered to hard-to-reach locations.
7.PoE signal conversion for non-PoE-compliant devices. Converters separate power and data to connect legacy devices.
8.Implement redundant and fault-tolerant PoE networks. Multiple injectors ensure service continuity even in the event of failures.
These devices are versatile and essential components for designing and implementing efficient industrial IoT networks.
