Connecting you with tips, trends and news for all things connectivity

Power Over Ethernet Gaining Momentum for IT Pros


Power Over Ethernet Gaining Momentum for IT Pros

The ability to send power over existing cabling isn’t a new idea (your telephone cable already does it), but it is one that is gaining momentum for IT Pros as they search for ways to solve complex problems.

The rapidly increasing number of devices in the workplace – Wi-Fi access points, security cameras, IP phones etc – all require both network connectivity and power, and are more often than not located in hard to get to locations.

Enter Power Over Ethernet (PoE)

Power over Ethernet is getting increasing attention because it delivers power using the existing communications cabling, bypassing the trouble of finding a power socket. PoE’s increasing visibility and usage saves costs in planning, installation of networks and deployment of other computing devices.

Another reason this technology is becoming increasingly important is the fact that it can also serve as redundant power supply for switches, which improves the fail safety of a network. The devices are supplied with power directly via the data cable, up to 100m away.

How PoE Works



A typical PoE system is comprised of a Power Sourcing Equipment (PSE) and a Powered Device (PD), whereby the PSE supplies power to the device over a data cable. The PSE acts as a voltage source and the PD is the natural termination of the link.

There are two common standards defined for PoE; IEEE 802.3af and 802.3at.

The Power Sourcing Equipment (PSE) such as a Network Switch with PoE or a dedicated PoE Injector provides power to the Ethernet cable at a maximum of 15.40 watts (IEEE 802.3af) or 25.50 watts (IEEE 802.3at). It acts as a voltage source and supplies Power over Ethernet Powered Devices with electricity via the communications data cable.

 How will PoE help me?

The benefits of having a single Ethernet cable carry both data and electrical power signals are clear:

  • Help businesses cut down on the cost of running both data and power cables (new location)
  • Help solve tricky installation issues when adding devices to existing infrastructure, by using the existing cabling
  • Provides greater flexibility when using an existing space that is limited in regards to power connectivity or simply trying to cut down on cable clutter in the office
  • Serves as redundant power supply for switches in cases of power failure, increasing network availability
  • More control over the deployed devices, including the ability to move the devices easily, without worrying about power outlet locations

Check out a few of our Power over Ethernet devices:

4-Port Gigabit Midspan (POEINJ4G)

8-Port Industrial Power over Ethernet Switch (IES8100POE)

4-Port Gigabit Power over Ethernet Network Card (ST4000PEXPSE)

Ethernet Media Converter (MCM110ST2)


  1. Mike Stephens 3 years ago

    We have been told by CDW that your POEINJ2GI has gone End of Life, is this true? If not who are your main distributors of this product? If it has gone EOL do you have a replacement? We use this part in a US Navy Program.

    • Elyse Trevail 3 years ago

      Hi Mike, thanks for contacting us. You are correct, this product will soon be discontinued at all of our partners, however, we do offer a 4-port solution that is in the same price range. The product ID you want to look for is POEINJ4G or CDW Part # 3696808. If you have any further questions, please don’t hesitate to contact us directly at 1 800 265 1844 or Live Chat at Thanks!

  2. jennifer 2 years ago

    Excellent article on Power over ethernet cable which are explained in detail. Each and every aspect of POE is comprehensively explained very easily. I am glad to see this valuable information.

Leave a reply to Mike Stephens Click here to cancel the reply

Your email address will not be published. Required fields are marked *