What is a PoE-powered switch (PSE)?

A PoE-powered switch is a unique type of switch that acts as both a Power Sourcing Equipment (PSE) and a Powered Device (PD) in a PoE network. It receives power via an Ethernet cable from an upstream PoE source (like a PoE switch or injector) while also distributing power to downstream devices. Here's how it works and its key features:

Key Features of a PoE-Powered Switch:

1.Dual Functionality (PSE and PD)

--- As a Powered Device (PD): The switch itself gets its power from another PoE switch or injector, eliminating the need for a dedicated electrical outlet.

--- As a Power Sourcing Equipment (PSE): Once powered, it can provide PoE to other connected devices, such as IP cameras, wireless access points, and VoIP phones, through its ports.

2.Simplified Installation

--- PoE-powered switches are ideal in areas where there are no convenient power outlets. They can be installed in locations where running traditional power cables would be difficult or costly, such as ceilings, outdoor environments, or remote corners of a building.

3.Flexible Power Distribution

--- The switch can extend the PoE power budget from the upstream PoE source to other devices, allowing for a more flexible network setup. For example, you can deploy multiple devices in remote areas without needing separate power sources for each one.

4.Reduced Cabling

--- Since both power and data are delivered over a single Ethernet cable, it reduces the complexity of the network infrastructure by minimizing the number of cables and power outlets required.

How It Works:

Upstream PoE Source: The switch receives power from an upstream PoE source (e.g., a central PoE switch or injector).

PoE Output: Once powered, the switch distributes both data and power to other connected devices via its PoE ports.

Example Use Case:

Imagine you need to deploy several IP cameras in a warehouse where power outlets are not readily available. Instead of running individual power cables to each camera, you can use a PoE-powered switch:

--- The switch is powered by a PoE-enabled port from a central switch.

--- The PoE-powered switch then powers multiple IP cameras through its PoE-enabled ports.

Power Considerations:

PoE-powered switches typically have a limited power budget based on how much power they receive from the upstream source. They must distribute that power carefully among connected devices. The upstream PoE source must provide enough power for both the switch and the devices it powers.

Benefits of PoE-Powered Switches:

1.Cost-Effective: Reduces the need for electrical installations and additional power adapters.

2.Flexible Deployment: Can be placed in hard-to-reach areas without needing direct power.

3.Simplified Network Infrastructure: Fewer cables and power sources are required, leading to cleaner installations.

4.Scalable: Easily expands network reach by daisy-chaining switches in remote locations without additional power sources.

Conclusion:

A PoE-powered switch simplifies network installations by receiving power from a PoE source and redistributing that power to other devices, making it an ideal solution for extending networks in remote or hard-to-power areas. Its dual role as both a powered device and power provider enhances flexibility in setting up networks, particularly in scenarios where running power lines is challenging.