POE

Power over Ethernet

Versatek's Power over Ethernet

PoE Calculator

Calculate the PoE you need

This calculator allows you to determine the voltage that will be delivered to the remote PoE device.

Device Information

Input Voltage:
(Volts)
Input Current:
(Amps)

Cable Information

Wire Gauge:
(AWG #)
Power Pairs:
(pairs used for power)
Cable Length:
(Feet)

Results

Voltage Drop:
(Volts)
Required Supply:
(Volts)
Effective Gauge:
(AWG #)
Cable Resistance:
(Ohms)
Power Dissipation:
(Watts per Foot)

Have a question?

Frequently Asked Questions

Can PoE and non-PoE PDs be used on a PoE switch at the same time?

Yes. PoE technology does not interfere with normal switch operations. In addition, many PoE switches feature the ability to disable PoE ports that do not need it—rendering them more power-efficient.

What category of Ethernet cable should be used with PoE?

CAT5e or better is strongly advised, with the most stable choice being CAT6A. CAT6A is generally considered the “future-proof” cable grade and is used in healthcare, educational institutions, enterprise business, military, and more.

What is a PoE calculator?

A Power over Ethernet calculator determines the amount of voltage that will be delivered to your remote PoE device.

How far can a PoE extender extend a network’s reach?

A PoE extender can increase a network’s range up to 102 kilometers (km)—about 4,000 feet. However, the distance extension depends on the power level needed. For instance, with most PoE extenders supporting 100 Megabits-per-second (MBps), the distance maxes out at 610m (2,000 feet).

Do I need a PoE injector if I have a PoE switch?

No. PoE injectors are required only in networks with standard (non-PoE) switches, and there is a desire to add PoE PDs to the system. PoE injectors are significantly less expensive than PoE switches and often prove to be the most economical solution to inserting PoE technology into a network. However, if the network is extensive and has dozens of PDs, biting the bullet and investing in a PoE switch is advisable.

Read

Understanding the Four Types of Power over Ethernet (PoE)

If you have never heard the term “Power over Ethernet,” you are not alone. This technology is nearly 20 years old and has become progressively more popular within the last ten years. There are many reasons for PoE’s expanding acceptance, especially in commercial and organizational networks. This article aims to explain PoE in a digestible way, emphasizing the four types of PoE.

The Global PoE Market

Because PoE features include control over network devices, cost-effectiveness, efficient monitoring, and flexible network architectures, the use of PoE technology increases every year.

News Channel Nebraska recently reported the global Power over Ethernet market size was $658.5 million in 2020 and is projected to reach $1,117.2 million by 2027.

What is PoE?

Simply put, PoE technology enables network cables to carry electrical power. To explain this, let’s use an IP security camera as an example:

A standard IP camera needs two connections to work correctly:

  1. A network connection that enables the camera to communicate with the video recording and display equipment, and
  2. A power connection that delivers the electricity needed to  run the camera

However, a PoE-enabled IP camera needs only the network connection as it will receive its electrical power from this cable as well.

In other words, PoE technology transmits both data and power over a single Ethernet twisted-pair cable.

How does PoE work?

PoE is pretty simple. Standard CATx Ethernet cable, which consists of four twisted pairs of wires, transmits both data and power to PoE-enabled powered devices (PDs).  There are four different types of Poe: Type 1, Type 2, Type 3, and Type 4. (More about these further on.) Type 1 and Type 2 use two twisted pairs to deliver data, while the remaining two are used to provide power. Type 3 and Type 4 use all four twisted pairs to transmit both power and data.

It is important to note that when the same twisted pairs are used for both power and data transmission, they do not interfere with each other because electricity and data are transported at opposite ends of the frequency spectrum.  For example, electricity has a low frequency of 60 hertz (Hz) or less, while data transmission frequencies range from ten to 100 million Hz.

Poe technology is introduced into a local area network (LAN) via PoE powering sourcing equipment (PSE), such as a PoE switch (endspan) or a PoE injector (midspan). The PSE provides a direct current (DC) voltage over a standard Ethernet cable to a connected PD.

PoE Standards and Types

What is the IEEE?

The IEEE (pronounced “Eye-triple-E”) stands for the Institute of Electrical and Electronics Engineers and “is the world’s largest technical professional society. It is designed to serve professionals involved in all aspects of the electrical, electronic, and computing fields and related areas of science and technology that underlie modern civilization.” 2

What is IEEE 802.3?

IEEE 802.3 is a group of standards that specify the operational characteristics of Ethernet. While there are many standard variations of IEEE 802.3, this article will discuss those that specifically deal with Power over Ethernet technology. The IEEE has ratified three standards of PoE that describe four different power levels (types), namely: IEEE 802.3af, 802.3at, and 802.3bt.

IEEE 802.3af

The IEEE introduced the original 802.3af PoE standard (simply called PoE or Type 1) in 2003. PoE Type 1 supports a maximum of 15.4 watts (W) on each port on the PSE (usually, a PoE switch). It is important to note that some power is always lost (or dissipated) during the transmission process. As a result, with Type 1 PoE, the PD will receive up to 12.95W. Type 1 supplies enough electricity to power PoE-enabled PDs, such as:

  • IP cameras
  • VoIP phones
  • Wireless Access Points (WAPs)
  • All kinds of meters

IEEE 802.3at

PoE technology needed to advance to support more power-hungry PDs, so in 2009, the IEEE ratified 802.3at (also called PoE+ or Type 2). This second standard increases power output to 30W, with 25.5W to the PD. A feature of 802.3at is that it is backward compatible with 802.3af/Type 1.  Type 2 supports such applications as:

  • Alarm systems
  • Biometric sensors
  • IP phones
  • Motion-tracking cameras
  • PTZ cameras
  • Remote computer terminals

IEEE 802.3bt

Type 3 (PoE++)

IEEE 802.3bt/Type 3 (also known as PoE++) carries up to 60W on each port, supplying a maximum of 51W to the PoE-enabled PD.  This is enough wattage to power devices such as:

  • Door access systems
  • Multi-radio WAPs
  • Thin clients (small computers)
  • Video telephones

Type 4 (Hi-PoE)

Type 4 is called high-powered PoE or Hi-PoE and delivers up to 100W on each port, with 71W to the PD. It is important to note that both Type 3 and Type 4 are backward compatible with Type 1 and Type 2. In addition, Type 4 is backward compatible with Type 3. PoE devices that Hi-PoE powers include:

  • Flat screens
  • LCD/computer monitors
  • LED lighting systems
  • Point-of-sale (POS) systems
  • Some laptops
  • Video displays 

Why Should You Consider PoE Technology for Your Business Network?

PoE technology has become hugely popular over the past ten years—for good reason, as PoE has many benefits to a business or organization.

Saves Cost and Time

PoE technology uses half the cabling of a traditional electrical wiring solution. For example, two cables are required to power Internet of Things (IoT) devices on a standard network: one to supply the electricity and one to transmit the data. As PoE sends both power and data over a single cable, the cost and number of cables are significantly reduced. In addition, PoE minimizes the use and expense of accessories (such as AC power adaptors, etc.). PoE also reduces the time spent on installation as there are fewer cables to run and the PoE devices themselves are plug-and-play. Last, because of PoE’s low wattage, expensive professional electricians are not necessary to install the system.

Flexible Network Design

PoE allows network engineers to design and configure device locations almost anywhere throughout a building without being limited by the number and location of electrical outlets. Unlike other technologies, PoE enables the placement of devices in remote areas with no access to wall outlets. The best example of this is wireless access points and IP cameras which need to be repositioned for better clarity.

Simple, Remote Power Management

Many PoE-enabled managed switches use the simple network management protocol (SNMP), which allows the power supply to be operated and maintained remotely. For instance, the power can be severed quickly and remotely if a security breach occurs to a PoE-enabled access point. SNMP also enables IT professionals to monitor the power supply and consumption levels, making network management simple and efficient.

Reliable and Secure

PoE technology relies on Ethernet, which has been thoroughly understood and vetted for years; therefore, any professional IT team can install and troubleshoot PoE. In addition, it is a wired technology with inherent limited interference and enhanced security features.

Scalable

PoE devices are not tethered to electrical wall outlets; thus, they can be located almost anywhere within the building. Therefore, it is possible to add or change devices within a PoE network with ease.

Safe

There is little chance of getting a shock from a disconnected cable with PoE due to its built-in safety protocol. A PoE-enabled PSE is programmed to experience a handshake with the PD before any electricity is delivered. This differs from standard AC power, which provides a continuous electricity supply whether or not devices are plugged in.

However, with PoE++ and Hi-PoE (60W to 100W), it should be noted that there is a possibility of heat rise if the cables are placed in large bundles. At these higher power levels, high-quality cables should be used and placed in small bundles (or even individually run).

Interoperational

All network topologies (including mesh and ring) can be configured in PoE. In addition, industrial networking tools such as IGMP, VLANs, and RSTP/STP can easily be managed using an advanced PoE switch. Also, if the PDs are not PoE-enabled, they can be converted by using a PoE injector or PoE splitter.

PoE Limitations

While PoE has undeniable advantages, there are a few limitations to be aware of:

Distance

PoE’s most significant restriction is that it has a distance range of 100 meters (approximately 328 feet). While this range works well for smaller environments, it is a concern for larger entities such as business campuses, businesses located on several different floors in a building, shopping malls, hotels, etc. To maintain optimal performance in these larger venues, PoE extenders will need to be utilized.

Legacy Equipment

If older technology is primarily being used in a network, chances are they will not be PoE compatible. Therefore, workarounds such as PoE injectors and PoE splitters will be necessary.

A Single Power Source

PoE technology uses a single power source (such as a PoE switch) to connect multiple PDs. Should any PDs experience failure, all the devices will stop working.

Expensive PoE Switches

PoE switches are relatively expensive. Installing a dedicated electrical line is cheaper but not nearly as flexible. In addition, it may be possible to purchase a less expensive PoE injector to meet the network’s needs.

PoE Products

The typical PoE system consists of two types of equipment: power sourcing equipment (PSE) and powered devices (PDs). Simply put, the PSE supplies the electrical energy via the cable to the PD. We have already given several examples of PoE PDs available on the market. This section will discuss the most common PoE PSE found in a PoE network.

PoE Switch

PoE switches have built-in PoE injection. They come in a variety of designs—from an unmanaged switch with a few ports to sophisticated multiport managed switches. PoE switches also come in industrial versions with hardened casings and high and low-temperature toleration for rugged environments.

PoE Injector

PoE injectors insert PoE technology into Ethernet cables. They power the data from a non-PoE switch and support local area networks (LANs) with both PoE-compliant and non-PoE-compliant PDs.

PoE Extenders

Also called PoE repeaters, PoE extenders are used to expand the transmission distance beyond the 100-meter distance limitation for twisted-pair Ethernet cables. PoE extenders are commonly used in commercial settings such as shopping malls, sporting venues, hotels, etc.

PoE Splitters

PoE splitters are intermediary devices that supply power to non-PoE PDs by splitting the power into a separate input. These devices are commonly used on legacy systems or low-power PDS such as IP cameras. PoE splitters are used to upgrade non-PoE-compliant PDs to PoE.

A Word About Industrial PoE

Industrial-grade PoE products are specifically designed to survive ambient temperatures and harsh environments. They provide several layers of enhanced protection against dust, water, ultraviolet (UV) rays, lighting, and temperature extremes. As a result, they are an excellent choice for traffic control cabinets, factory workshops, outdoor locations, etc. 

Conclusion

Power over Ethernet is a genuinely cost-effective, infinitely adaptable, and easily scalable power solution for any business network. It will serve a company’s business needs in the present and future.

Our Blog

Interested in Industrial PoE?

Check out our blog entitled 5 Reasons You Need An Industrial Ethernet Switch.

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C50-162-30-250 Managed ONVIF GbE Switch with 16 X 30W PoE and 2 SFP Interfaces

$650.00

C50-162-30-250, a basic Layer 2 Smart PoE Switch, is equipped with 16-port Gigabit PoE (10M/100M/1G) and 2-port Gigabit (100M/1G) SFP transceiver slots for flexible link. With total power budget up to 250W, C50-162-30-250 is an optimum framework and solution forPoEIP device such as IP cameras and wireless APs complying ONVIF, UPnP or ARP protocol.

AETEK’s C50 series to ONVIF cameras will not only be a smart L2 PoE Gigabit switch, but also be the centralized IP surveillance controller. The functions of IP surveillance controller incorporate multi-brand ONVIF IP surveillance products including camera, NVR, and video server to configure and manage over a single IP network. The unique benefits by dedicated TAB & GUI generate IP surveillance topology automatically once ONIF cameras are connected to C50 smart L2 PoE switch.

Installers can easily catch comprehensive individual ONVIF camera information including camera list, IP/MAC address, topology, power consumption, and traffic monitoring via web browser. Furthermore, an intuitive web GUI leads installer to group VLAN across switches, reboot camera, and diagnose cable via graphic topology. C50 series is the innovative SmartL2 PoE switch that brings the ONVIF cameras to benefit of simplified management, reduced complexity, lowered cost for IP surveillance deployments.

C50-242-30-370 Managed ONVIF GbE Switch with 24 X 30W PoE and 2 SFP Interfaces

C50-242-30-370, a basic Layer 2 Smart PoE Switch, is equipped with 24-port Gigabit PoE (10M/100M/1G) and 2-port Gigabit (100M/1G) SFP transceiver slots for flexible link. With total power budget up to 370W, C50-242-30-370 is an optimum framework and solution forPoEIP device such as IP cameras and wireless APs complying ONVIF, UPnP or ARP protocol.

AETEK’s C50 series to ONVIF cameras will not only be a smart L2 PoEGigabit switch, but also be the centralized IP surveillance controller. The functions of IP surveillance controller incorporate multi-brand ONVIF IP surveillance products including camera, NVR, and video server to configure and manage over a single IP network. The unique benefits by dedicated TAB & GUI generate IP surveillance topology automatically once ONIF cameras are connected to C50 smart L2 PoE switch.

Installers can easily catch comprehensive individual ONVIF camera information including camera list, IP/MAC address, topology, power consumption, and traffic monitoring via web browser. Furthermore, an intuitive web GUI leads installer to group VLAN across switches, reboot camera, and diagnose cable via graphic topology. C50 series is the innovative SmartL2 PoE switch that brings the ONVIF cameras to benefit of simplified management, reduced complexity, lowered cost for IP surveillance deployments.

VX-GPH8245 5-Port Gigabit Ethernet Smart-Managed Switch with 4 PoE+ Ports

$88.00

5-Port PoE Switch

The Versa Technology VX-GPH8245 is a 5-port gigabit ethernet smart-lite switch with 4 PoE+ ports. With a total of 5 backwards-compatible gigabit ports, you can integrate computers, printers, access points, etc. in your network reliably. The VX-GPH8245 can also supply power to PoE-enabled devices via its 4 PoE ports (IEEE 802.3af). This eliminates the need for an additional power cable. To ensure silent operation in the workplace, the VX-GPH8245 is equipped with a fanless design. The switch is “smart managed” for optimal usage and comfort. This allows configurable VLAN and QoS, among other things.

Features:

  • 5-Port 10/100/1000Mbit/s Gigabit Ethernet Switch
  • 4-Port PoE, follow IEEE 802.3at and IEEE 802.3af standard
  • PoE Budget ca. 70W for a max. of 4 devices, supports a max. of 30W per port IEEE 802.3at
  • Easy Smart-Managed
  • Web UI for configuration
  • PoE On/Off control
  • Fanless Design

VX-IGPU-2708A Industrial L2+ Managed GbE UPOE Switch with 6-Port 10/100/1000TX Shared 4 UPoE + 2 100/1000 SFP

The VX-IGPU-2708A from Versa Technology is an industrial L2+ managed GbE UPoE switch offering powerful L2 and basic L3 features with better functionality and usability. In addition to the extensive management features, the VX-IGPU-2708A also provides carrier Ethernet features such as OAM/ CFM/ ERPS/ EPS/ PTPv2, of which makes it suitable for industrial and carrier Ethernet applications.

The VX-IGPU-2708A features 6 (10M/100M/1G) RJ45 ports with 4 UPoE ports (supports 802.3 at/af/UPoE and total of up to 240W), 2 GbE SFP ports and 1 RJ45 console port. The VX-IGPU-2708A also provides high hardware performance.

The embedded Device Managed System (DMS) feature allows users to easily configure, install and troubleshoot their video surveillance systems, wireless access points, and other industrial applications. The VX-IGPU-2708A is the ideal switch to deliver simple management, better user experiences, and the lowest total cost of ownership.

Features:

  • Rapid Ring (R-Ring)
  • Built in Device Management System (DMS)
  • iPush APP for real time alarm notification
  • ITU-T G.8031 Ethernet Linear Protection Switching (EPS)
  • ITU-T G.8032 Ethernet Ring Protection Switching (ERPS)
  • IEEE 1588v2 PTP
  • IEEE 802.3ah OAM
  • IEEE 802.1ag CFM (ITU-T Y.1731 Performance monitoring)
  • DHCP Server
  • IEEE 802.3az Energy Efficient Ethernet standard for green Ethernet application
  • IEEE 802.3af/at/UPoE Power over Ethernet
  • IPv4/IPv6 L3 static route
  • EtherNet/IP (by request)
  • PROFINET (by request)

VX-IGP-1204F 12-Port Managed Industrial Switch with 8 IEEE 802.3at PoE Ports

$659.00

Versa Technology’s VX-IGP-1204F Managed Gigabit Ethernet switch provides 8 10/100/1000BaseT PoE PSE ports and 4 100/1000Base SFP ports. The unit complies with the IEEE 802.3at standard and is able to deliver up to 30 watts of power per port along with data on standard Ethernet cabling. The VX-IGP-1204F can be used to power any IEEE 802.3af/at compliant PoE PD device with the PoE power management feature. This will ease the deployment effort of planning PoE power budget and eliminates the need for additional wiring to reach a power source.

Features:

  • Provides 8 10/100/1000Base TX PoE ports, plus 4 100FX/1000BaseF SFP slots
  • IEEE 802.3af 15.4W / IEEE 802.3at 30W (2-pairs) High Power PoE
  • Total PoE power budget: Max. 240W PSE power delivered
  • 9K Jumbo frames
  • L2 wire-speed switching engine
  • 8K MAC forwarding addresses
  • Network redundant LACP, Spanning tree STP, RSTP & MSTP, and quick Ring fail-over protection (< 20ms)
  • Port-based / tag-based VLAN, IEEE 802.1ad / QinQ VLAN, add / remove VLAN tags
  • Multicasting supports IGMP v1/v2, proxy & snooping
  • Multicast / Broadcast / Flooding Storm Control
  • IEEE 802.1x access control
  • Per VLAN mirroring
  • CLI / Web / SNMP management interfaces
  • PoE PSE power management & PD power consumption monitoring
  • Dual power input & reverse power protection
  • DIN-Rail and wall mounting option
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