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→Passive PoE
==Summary==
==Summary==
This chapter is an overview of recommended use active and passive PoE
This chapter is an overview of recommended use active and passive PoE
<b>Note: </b> The following recommendations apply to Teltonika devices
<b>Note: </b> The following recommendations apply to Teltonika devices
===Active PoE===
==Active PoE==
===How Active PoE Works===
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Active PoE (Power over Ethernet) refers to the technology that allows network cables to carry electrical power along with data to remote devices. This technology simplifies installation and reduces the need for separate power supplies and outlets for each device. Active PoE is standardized by the IEEE and comes in various classes, each specifying different power levels.
Active Power over Ethernet (PoE) is a technology that allows Ethernet cables to carry electrical power, along with data, to remote devices. Active PoE follows specific IEEE standards (802.3af, 802.3at, and 802.3bt) that ensure safe and efficient power delivery. Here’s a step-by-step explanation of how Active PoE works:
#'''Detection:''' The Power Sourcing Equipment (PSE) sends a small voltage to detect a compatible Powered Device (PD).
#'''Classification:''' The PSE classifies the PD by sending a higher voltage to determine its power requirements.
#'''Power-Up:''' The PSE gradually increases the voltage to the required level.
#'''Power Delivery:''' Power and data are transmitted simultaneously over the Ethernet cable. The PSE continuously monitors the power supply to ensure safe and #stable operation.
Here's a table outlining the different classes of Active PoE:
Here's a table outlining the different classes of Active PoE:
Each class within these standards specifies the maximum power that can be delivered to a powered device (PD), and the maximum power that can be drawn from the power sourcing equipment (PSE), ensuring compatibility and efficient power management across various devices and applications.
Each class within these standards specifies the maximum power that can be delivered to a powered device (PD), and the maximum power that can be drawn from the power sourcing equipment (PSE), ensuring compatibility and efficient power management across various devices and applications.
==Passive PoE==
===How Passive PoE Works===
===How Passive PoE Works===
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=====Use Case Summary=====
=====Use Case Summary=====
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Passive PoE: Simplifies power delivery by providing a fixed voltage but lacks safety and negotiation features of Active PoE.
*'''Passive PoE:''' Simplifies power delivery by providing a fixed voltage but lacks safety and negotiation features of Active PoE.
Correct Usage: Ensure voltage and device compatibility, use proper wiring, and stick to low power devices.
*'''Correct Usage:''' Ensure voltage and device compatibility, use proper wiring, and stick to low power devices.
Incorrect Usage: Avoid mismatched voltages, incompatible devices, overloading, and improper wiring to prevent damage and ensure reliable operation.
*'''Incorrect Usage:''' Avoid mismatched voltages, incompatible devices, overloading, and improper wiring to prevent damage and ensure reliable operation.
Using Passive PoE appropriately can be cost-effective and straightforward, but it requires careful consideration of device requirements and proper installation practices to avoid potential risks.
Using Passive PoE appropriately can be cost-effective and straightforward, but it requires careful consideration of device requirements and proper installation practices to avoid potential risks.
==Key Differences Between Active and Passive PoE==
===Active PoE===
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*'''Standards:''' Follows IEEE standards (802.3af, 802.3at, 802.3bt).
*'''Power Delivery:''' Uses a negotiation process to determine and supply the correct power level to devices.
*'''Voltage:''' Typically delivers 48V DC, but can vary based on device classification.
*'''Complexity:''' More complex and sophisticated system with power negotiation and monitoring.
*'''Compatibility:''' Suitable for a wide range of devices with varying power requirements.
*'''Safety:''' Ensures safe and efficient power delivery by regulating voltage and current.
*'''Examples:''' Used in devices like IP cameras, wireless access points, and VoIP phones.
===Passive PoE===
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*'''Standards:''' Non-standardized, does not follow IEEE standards.
*'''Power Delivery:''' Supplies a fixed voltage (e.g., 12V, 24V, 48V) directly through the Ethernet cable without negotiation.
*'''Voltage: Fixed''' voltage delivery without adjustment based on device needs.
*'''Simplicity:''' Simpler and less expensive to implement compared to Active PoE.
*'''Compatibility:''' Limited to devices that specifically support the fixed voltage provided.
*'''Risk:''' Higher risk of damaging devices if the voltage supplied does not match device requirements.
*'''Examples:''' Commonly used to power up some of the Teltonika [https://wiki.teltonika-networks.com/view/Passive_Power_over_Ethernet_(PoE) devices].
===Key Differences Sumarry Between Active and Passive PoE===
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Active PoE is standardized, involves power negotiation for precise delivery, and supports a wide range of devices. In contrast, Passive PoE delivers a fixed voltage without negotiation, offering simplicity and lower cost but with increased risk of compatibility issues and potential device damage if not properly matched.
