PoE (Power over Ethernet)
Power over Ethernet (PoE) technology allows Ethernet cables to
carry electrical power and data. Thus, a single cable can
provide a data connection and power to devices such as wireless access
points, IP cameras, and VoIP phones.
Key Features of PoE:
- Single Cable Solution: PoE eliminates the need for separate power supplies and outlets, simplifying installation and reducing clutter.
- Standards: There are several PoE standards, including:
IEEE 802.3af: Provides up to 15.4 watts of power.IEEE 802.3at (PoE+): Provides up to 25.5 watts of power.
IEEE 802.3bt (PoE++): Provides up to 60 watts (Type 3) and 100 watts (Type 4) of power.
Safety:
- PoE is designed to be safe, with built-in mechanisms to prevent overloading and underpowering devices.
Common Uses:
- Wireless Access Points (WAPs): PoE is commonly used to power WAPs, allowing them to be placed in optimal locations without needing a nearby power outlet.
- IP Cameras: Security cameras can be easily installed and powered using PoE, simplifying the setup process.
- VoIP Phones: PoE powers VoIP phones, enabling them to be placed anywhere with an Ethernet connection.
How PoE Works:
- Power Sourcing Equipment (PSE): Devices like PoE switches or injectors that provide power over the Ethernet cable.
- Powered Device (PD): Devices like IP cameras or WAPs that receive power from the Ethernet cable.
Benefits:
- Flexibility: Devices can be placed in locations without access to power outlets.
- Cost Savings: Reduces the need for electrical wiring and outlets, lowering installation costs.
- Scalability: Easy to expand and upgrade networks by adding more PoE-enabled devices.
PoE
is a versatile and efficient solution for powering network devices, making it a
popular choice in home and business environments.
This is covered in A+ and Network+.