How Do PoE Switches Work?

All modern industrial equipment uses long cables for power transmission. As these devices require more power, the use of cables continues to increase and brings more complexity. This is where Power over Ethernet (PoE) technology comes into play. It ensures higher power transmission using fewer cables compared to other contemporary technologies. Like any other technology, PoE is managed through various devices, such as PoE switches. So, what is a PoE switch and how does it work? This article answers all the information about these devices.

Basic Introduction to PoE Technology

PoE is a special network feature that allows network cables to carry both electricity and data to devices at the same time. Although data and electricity are transmitted using the same cable, they use different wires. This technology manages the working of any network device and helps ensure interoperability between different devices connected in the network.

PoE devices include power supply equipment (PSE) and powered devices (PD). PSE is a device that transmits power, and a PoE switch is a PSE. The device that receives power is called a PD.

PoE Switches and How They Work Explained

Power over Ethernet (PoE) switch configuration is easy to understand due to its simple structure. The switch has multiple Ethernet ports to ensure consistent power and network communication for the devices connected to it. These switches can be operated in any of the following configurations:

• Mode A configuration: In this configuration, the switch transmits power and data over the same wire.
• Mode B configuration: In this configuration, the switch transmits power and data over different wires.

Most industrial PoE switches have 5 or 8 ports, while non-industrial PoE switches may have 8, 24, or 48 ports. These switches are divided into two types - managed switches and unmanaged switches.

Three reasons for industrial PoE switches

These switches have gained popularity in recent years due to the following advantages.

• Reliability: Unlike other traditional power distribution sources, PoE switches consolidate power distribution onto a single power source. These switches are universally compatible and can be used to reset or disable devices. Additionally, these switches can be equipped with uninterruptible power supplies.
• Flexibility: PoE switches do not require additional cables as they transmit data and power over Ethernet cables. Devices connected to the switch can be easily relocated to new locations as per the requirement. The powerful combination of wireless technology and PoE creates a cable-free environment, ensuring smooth working of devices connected to it.
• Cost-effective: Like other traditional technologies, PoE switches reduce the need for additional power wiring. These switches can be easily installed anywhere and can be installed without the intervention of experts. All this ensures significant savings in installation costs, maintenance costs, and manpower.

Three key applications of industrial PoE switches

Due to the above advantages, PoE switches are used in various applications. Here are three key applications:

• IP Cameras: Most of the network surveillance cameras used in offices and industrial places are PoE powered. These camera systems receive power and data from PoE switches. These days, it is mandatory to use these switches to ensure the safety of people and the surrounding environment.
• Wireless Networking: PoE switches have contributed to the growth of wireless networking. They have largely helped avoid the huge installation costs associated with access points and controllers. Bluetooth applications, RFID readers, and Wifi devices are devices that make use of wireless networking. These devices can be easily migrated to new sites based on usage.
• VoIP Phone: This PoE application utilizes a single connection to a wall socket. PoE switches facilitate the increasing use of VoIP phones for business communications.