What is a PoE Switch and how does it work?
A PoE switch is a network switch that uses Power over Ethernet (PoE) technology. With a PoE switch, both network connectivity and power for a PD (Powered Device) can be delivered efficiently through a single Ethernet cable. With the growing number of IoT deployments, such as smart buildings, PoE switches are expected to play an even larger role in the future.
Why do you need a PoE Switch?
The benefit of choosing a PoE switch over a standard (non-PoE) switch becomes clear in a direct comparison. A standard switch only transmits data to network devices. To use PoE with a non-PoE switch, you typically need midspan power sourcing equipment, such as a PoE Injector, placed between the switch and the device. The injector adds electrical power while receiving data from the cable connected to the non-PoE switch, and then delivers both power and data to the device. In this setup, the injector also needs its own power source.
With a PoE switch, you only need one power cable to the switch and one network cable to the PD. The PD can then be connected directly to a PoE port for both data transmission and power delivery.
Benefits of a PoE switch
- Flexibility: By removing the limitations of standard switches that require additional power supplies and extension cables, a PoE switch provides more flexibility for your network cabling. For example, an IP camera can be installed exactly where it is needed. A PoE switch combined with wireless technology can also enable “cable-free” solutions.
- Simplicity: Since there is no need to install extra power supplies and installation points, a PoE switch simplifies the overall network deployment. High-quality PoE switches may also support SNMP (Simple Network Management Protocol), making monitoring and management easier.
- Cost savings: A PoE network switch reduces the need to purchase and install additional cables and power outlets, which can lead to significant savings in installation and maintenance.
PoE Switch limitations
1. Distance limitation
As a general rule of thumb, PoE over copper Ethernet is limited to 100 meters. If you need to exceed this distance, solutions such as PoE extenders and fiber cabling are available. Contact us to learn more.
2. Power
If you require higher power over the PoE network, ensure the PoE switch power capacity meets your requirements, as there are power limits defined by PoE standards.