# PoE power-sourcing interface

Canonical URL: https://eloragrid.ai/symbols/poe-power-sourcing-interface
Publisher: Elora Grid
Updated: 2026-10-27
Lookup label: PoE PSE
Drawing use: Schematic
Reference families: Manufacturer

A PoE power-sourcing interface manages the supply end of a compatible powered Ethernet connection.

## In plain English

### What does PoE power-sourcing interface mean?

A PoE power-sourcing interface manages the supply end of a compatible powered Ethernet connection.

### A simple example

A selected network switch can provide power to a recognised powered device through its PoE port.

### What the drawings help you do

Locate this function at the end providing power to the cable. Show detection and power control separately from the Ethernet data function. A port must use its selected PoE arrangement rather than simply placing a supply across arbitrary network conductors.

### Before using this reference

- Identify the sourcing port and intended powered device.
- Reference the supported classification and power-budget arrangement.
- Show protection and port-control connections from the selected design.

### Does a PoE-capable port guarantee enough power for every device?

No. The source, receiver, cable and negotiated operating conditions must be compatible. A device’s full operating demand and the source’s available budget require their own checks.

### Terms

- PSE: Power-sourcing equipment, the supplying end of a PoE connection.
- Power budget: The available power allocated across the selected ports and operating conditions.

Concept diagram: Port power supply → Power-sourcing interface → Compatible powered cable link
Original functional explanation. Arrows show information or energy roles; two-headed arrows identify two-way interfaces. This is not a pinout, certified standards graphic or complete circuit.

- [Power over Ethernet interfaces](https://www.ti.com/product-category/power-management/power-over-ethernet-ics/overview.html)


## What it represents

A PoE power-sourcing interface manages the supply end of a compatible powered Ethernet connection.
A selected network switch can provide power to a recognised powered device through its PoE port.
Locate this function at the end providing power to the cable. Show detection and power control separately from the Ethernet data function. A port must use its selected PoE arrangement rather than simply placing a supply across arbitrary network conductors. This is original functional artwork, not a certified standard graphic or device pinout.

## How to read it

- Identify the sourcing port and intended powered device.
- Reference the supported classification and power-budget arrangement.
- Show protection and port-control connections from the selected design.
- A sourcing port's class and power capability must match the complete link and connected device.

## Information to show or reference

- Identify the sourcing port and intended powered device.
- Reference the supported classification and power-budget arrangement.
- Show protection and port-control connections from the selected design.

## Important distinction

A sourcing port's class and power capability must match the complete link and connected device.

## Facts

- Representation type: Original functional block; not a certified IEC or IEEE graphic
- Concept input: Port power supply
- Concept output: Compatible powered cable link

## Public references

- [Power over Ethernet interfaces](https://www.ti.com/product-category/power-management/power-over-ethernet-ics/overview.html) — Texas Instruments. Power over Ethernet interfaces: public technical context for the named function. Product and compliance details remain with the publisher.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.