PoE (Power Over Ethernet Technology) and Its Benefits.
                     Power Over Ethernet 
Technology and Its 
Benefits
Overview of PoE
Power-over-Ethernet is a term for a technology that 
enables the transmission of data and power on the same 
Ethernet cable, over a 100m transmission distance. This 
technology reduces the need for a separate power line and 
an electrical connection (AC) for powering the device. 
The technology also helps reduce the need for cables and 
other accessories that are required for making a 
connection.
Working of PoE
Each network cable comprises four twisted pairs of wires, which makes eight wires. The pairs that are 
used for sending information are known as data pairs and the unused pairs are referred to as spare pairs. 
In PoE applications, each pair acts as a single conductor. This means you can use the two spare pairs or 
two data pairs for transmitting electrical current. PoE is usually injected into the cable at 48 V. Any 
voltage between 44 and 57 volts DC is considered ideal. 
Power over Ethernet (PoE) 
Implementation
PoE devices can be implemented as midspans or endspans. Powered devices (PDs) can receive power from both 
these types of devices.
Endspans: Endspan devices need PoE-enabled switches, and 
are usually preferred for new installations. An L2 switch 
supporting PoE is one of the brilliant examples of endspans.
Midspans: These devices utilize an injector or a powered 
patch panel, which is usually positioned between the PD and 
an Ethernet switch. 
PoE Standardization
IEEE 802.3af provide up to 15.4 watts of DC power (at 48V DC) at each port.
IEEE 802.3at provide up to 25.5 watts at 48V DC.
IEEE 802.3bt provide up to 60 watts at 48V DC.
Developed for 100BASE-T4, 100BASE-TX, and100BASE-FX fast 
IEEE 802.3u 
Ethernet applications
Developed for 1000BASE-T Gbit/s Ethernet over twisted pair with a 
IEEE 802.3ab
delivery speed of 1 Gbit/s (125 MB/s)
Developed for 1000BASE-X Gbit/s Ethernet over Fiber-Optic with a 
IEEE 802.3z
delivery speed of 1 Gbit/s (125 MB/s).
Benefits of PoE
PoE technology has gained immense popularity over the years owing to the distinct 
benefits that it offers.
• Cost and Time Savings
• Flexibility of Network Design
• Easy & Smart Power Management
• Reliability & Scalability
PoE Products offered by VERSITRON
PoE and PoE+ Switches PoE Media Converters PoE Injector
Applications of PoE
The devices that use PoE for data and power supply are referred to as smart devices. 
• PoS Kiosks • Security Access Controls
• LED Lighting Systems • Smart Clocks
• Routing Boxes and Networked Audio Breakout • Routers
• IPTV Decoders • VoIP Phones
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You !!!
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