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PoE power supply or PoE switch

Fiber optic patch cord knowledge brief Published 15 Sep 2019

Prepared for preliminary research by the JEWELBLU OPTICAL knowledge desk. Confirm connector types, fiber grades, polish, loss budgets and installation requirements against current standards and product documentation.

A PoE switch is ideal for multiple devices and centralized management, while a PoE power supply (injector) is better for powering a single device or small setups.PoE Switch Overview

A PoE switch is a network switch that delivers both data and electrical power over Ethernet cables to connected devices, such as IP cameras, VoIP phones, and wireless access points . PoE switches come in different standards:

  • PoE (IEEE 802.3af): Supplies up to 15.4W per port, suitable for low-power devices .
  • PoE+ (IEEE 802.3at): Supplies up to 30W per port, ideal for devices like PTZ cameras or multi-antenna access points .
  • PoE++ (IEEE 802.3bt): Type 3 delivers up to 60W, Type 4 up to 100W per port, supporting high-power devices like building automation systems or large wireless access points . PoE switches simplify installation by eliminating the need for separate power adapters and allow centralized management, monitoring, and scheduling of power delivery . They are cost-effective for networks with multiple devices and reduce cable clutter.
PoE Power Supply (Injector) Overview

A PoE power supply, also called a PoE injector, provides power to a single device over Ethernet without requiring a PoE switch. It is useful when:

  • You have only one or a few devices to power.
  • Your existing network switch does not support PoE.
  • You want a simple, low-cost solution without upgrading the entire network infrastructure. Injectors are generally limited to the power standard they support (PoE, PoE+, or PoE++), so you must ensure compatibility with the device's power requirements.
Choosing Between the Two
  • Use a PoE switch if you have multiple devices, need centralized management, or plan to expand your network. It reduces the number of power adapters and simplifies cabling.
  • Use a PoE injector/power supply if you have a single device or a small number of devices and do not want to replace your existing switch. Key Considerations:
  • Check the power requirements of your devices to match the PoE standard.
  • Consider the total power budget of a PoE switch to ensure all devices receive sufficient power .
  • For high-power devices like PTZ cameras or multi-radio access points, a PoE++ switch or injector may be necessary . In summary, a PoE switch is the best choice for scalability and centralized control, while a PoE power supply is suitable for small, simple setups or retrofitting non-PoE networks.

PoE power supply or PoE switch - JEWELBLU OPTICAL SYSTEMS [PDF]

PoE power supply or PoE switch

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Technical note

This reference is intended for preliminary fiber optic patch cord research. Compatibility, link budgets, connector types, polish, installation methods, test limits and applicable standards must be verified for the specific project.

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