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A PoE port carries Ethernet data and electrical power over the same cable. Its wattage depends on the IEEE PoE type and class the switch can supply, while the switch’s total PoE budget determines how much power all its active ports can share. Crucially, the power sent by the switch is higher than the maximum available to the receiving device because some is lost in the cable.
What a PoE switch port does
A Power over Ethernet (PoE) link has two roles: the power-sourcing equipment (PSE), usually a PoE switch, sends power; the powered device (PD), such as a camera or access point, receives it. Data and power travel over the Ethernet connection, so a compatible endpoint may not need a separate power adapter.
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A switch’s per-port rating and the power that reaches the device are different figures. The PSE rating is the maximum supplied at the source; the PD rating is the maximum available at the endpoint under the standard, after cable loss.
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“PoE” commonly means IEEE 802.3af Type 1, while “PoE+” commonly means IEEE 802.3at Type 2. IEEE 802.3bt defines the higher-power Type 3 and Type 4 categories. These are standardized maximums, not measurements of a particular switch or a guarantee that all its ports can deliver their maximums simultaneously.
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| IEEE type / common name | Standard | Maximum from PSE | Maximum at PD | Class and pair use |
|---|---|---|---|---|
| Type 1 / PoE | 802.3af | 15.4 W | 13 W | Classes 1–3; two pairs |
| Type 2 / PoE+ | 802.3at | 30 W | 25.5 W | Class 4; two pairs |
| Type 3 | 802.3bt | 60 W | 51 W | Classes 5–6; Class 5 and above require four pairs |
| Type 4 | 802.3bt | 90 W | 71.3 W | Classes 7–8; four pairs |
The Ethernet Alliance’s 2019 overview and certification brief give these standardized maximums. For Type 3, pair use depends on class: higher classes require all four pairs. The Ethernet Alliance describes IEEE PoE links over up to 100 meters of standard Ethernet cable; that is not a guarantee for every cable or installation. Ethernet Alliance, “Overview of 802.3bt – Power over Ethernet Standard” (2019); Ethernet Alliance PoE Certification Brief (2019).
What PoE classes mean
Class identifies a device’s power category; it does not say how much power a switch can supply to every port at once. Ethernet Alliance’s overview lists the following PSE/PD class values:
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- GIGABIT ETHERNET PORTS: Features 8 x 1.0Gbps Ethernet ports for high-speed connectivity. Auto-negotiating ports detect the optimal speed for connected devices and work with existing Cat5e or Cat6 Ethernet cables.
- POWER-OVER-ETHERNET (PoE): Includes 8 PoE+ ports with 62W total power budget, plus uninterrupted PoE and per-port PoE controls for managed power delivery.
- EASY SMART MANAGED NETWORK SWITCH: Intuitive software interface offers Easy Smart Managed Essentials capabilities to configure VLANs, prioritize traffic with QoS, monitor ports, and manage network security for small businesses.
- FLEXIBLE MOUNTING OPTIONS: Compact metal design supports desktop or wall-mount placement for versatile installation.
- SILENT & ENERGY-EFFICIENT OPERATION: Fanless design ensures silent performance, while IEEE 802.3az Energy Efficient Ethernet reduces power consumption without compromising high-speed network performance.
| Class | Maximum from PSE | Maximum at PD | IEEE type |
|---|---|---|---|
| 1 | 4 W | 3.84 W | Type 1 |
| 2 | 7 W | 6.49 W | Type 1 |
| 3 | 15.4 W | 13 W | Type 1 |
| 4 | 30 W | 25.5 W | Type 2 |
| 5 | 45 W | 40 W | Type 3 |
| 6 | 60 W | 51 W | Type 3 |
| 7 | 75 W | 62 W | Type 4 |
| 8 | 90 W | 71.3 W | Type 4 |
These are standard class limits, not a promise about a specific product. Check the switch and endpoint specifications for the supported type, class and per-port limits. Ethernet Alliance overview (2019).
How a switch’s PoE power budget works
Three figures matter when planning a PoE installation:
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- Cost-Effective, Durable Design for Long-Term Use: 8-port PoE+ ethernet gigabit switch features a rugged casing and advanced heat dissipation, paired with low-power, fanless operation for silent, long-lasting performance—even under heavy loads. Plus, its intuitive visual interface simplifies remote management: easily monitor network status, configure devices, and troubleshoot on-site issues without needing to be physically present.
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- Per-port PSE capability: the class or maximum wattage the port can supply.
- PD requirement: the class and power the endpoint needs to operate as intended.
- Aggregate switch PoE budget: the total power the switch can distribute across its PoE ports.
The aggregate budget limits the combined load. A switch can support a given class on each port and still lack the total power to run every port at its maximum at once. The actual allocation behavior depends on the model and its power-management rules, so consult the manufacturer’s data sheet for the total budget, per-port constraints and number of endpoints it can power together.
Some systems use Autoclass to measure a powered device’s draw and optimize the allocation, accounting for cable losses. If the PSE cannot meet demand, it may use power demotion to assign a lower class; the endpoint may then operate with limited functionality. These features and behaviors depend on support in the equipment. Ethernet Alliance overview (2019).
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- More Ports, PoE Ready: UGREEN ethernet switch offers 8 PoE+ (802.3at/af) Gigabit ports (up to 30W each) and 2 Gigabit uplink ports, with a total power budget of 60W. Ideal for efficient power delivery and seamless network connectivity
- Intelligent Power Management: If power exceeds 60W, it cuts ports in priority order (8–1) to prevent overload. It auto-detects PoE devices, supplies power to them, and transmits data only to non-PoE devices. Short-circuited ports shut off independently
- PoE Auto Recovery: In Extend Mode, ports 1–6 automatically detect and restart powered devices (such as cameras or access points) when they go offline or freeze, ensuring stable PoE operation without manual monitoring or restart
- One Touch, Three Modes: The unmanaged ethernet switch can easily switch between Standard, Port Isolation (VLAN), and Extend with one button. Port Isolation separates ports 1–8 to prevent network storms. Extend mode supports PoE up to 820 ft, ideal for security systems and long-distance deployment
- High-Speed, Low Latency: The ethernet splitter offers 1000Mbps connectivity for real-time, lag-free monitoring with security cameras, efficient IP phone connections for work, and enhanced performance for wireless access points across your network
Can you plug a PoE+ device into a PoE switch?
IEEE standards-based PoE generations are intended to interoperate, but an older or lower-power PSE cannot provide more power than it supports. A PoE+ endpoint connected to a Type 1 PoE port may receive power only within the older port’s limits; it may not work fully if it needs more than the available allocation. The Ethernet Alliance’s 2019 white paper describes the limitation this way: “All PoE devices (sources or loads) are interoperable, the only limitation being that a new high power PD (Powered Device) will not get the full power from an older or lower power PSE (Power Sourcing Equipment).” The limitation matters: compatibility is not a promise that a device will receive the wattage or features it needs. Ethernet Alliance, “Overview of 802.3bt – Power over Ethernet Standard” (2019).
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- GIGABIT ETHERNET PORTS: Features 8 x 1.0Gbps Ethernet ports for high-speed connectivity. Auto-negotiating ports detect the optimal speed for connected devices and work with existing Cat5e or Cat6 Ethernet cables.
- POWER-OVER-ETHERNET (PoE): Includes 8 PoE+ ports with 83W total power budget, plus dynamic PoE allocation that redistributes unused power to support power-hungry devices.
- PLUG-AND-PLAY UNMANAGED NETWORK SWITCH: Simple plug-and-play setup with no software to install or configuration required.
- FLEXIBLE MOUNTING OPTIONS: Compact metal design supports desktop or wall-mount placement for versatile installation.
- SILENT & ENERGY-EFFICIENT OPERATION: Fanless design ensures silent performance, while IEEE 802.3az Energy Efficient Ethernet reduces power consumption without compromising high-speed network performance.
Check these details before choosing a switch or endpoint
- Confirm the IEEE standard/type and class supported by the switch port, and the class and wattage the powered device requires.
- Compare the switch’s maximum per-port output with its aggregate PoE budget; consider how many endpoints must run simultaneously.
- Check whether the endpoint needs 802.3bt four-pair power. Type 1 and Type 2 use two pairs; Type 3 and Type 4 use four pairs for higher classes, and Type 4 uses four-pair delivery.
- Verify cable type, length and installation quality. The 100-meter figure describes IEEE PoE over standard Ethernet cable, not every real-world link.
- If the existing switch has no PoE, consider whether a midspan PSE—commonly called an injector—can add power to the link between that switch and the powered endpoint, rather than replacing the switch.
An integrated Ethernet switch is the common PSE, while a midspan PSE sits between a non-PoE switch and the endpoint to add power. Ethernet Alliance PoE overview; Ethernet Alliance PoE overview (2018).
IEEE PoE is not the same as passive PoE
Do not assume that every product labeled “PoE” follows the IEEE standards. Passive PoE implementations can apply voltage continuously without standards-based detection, and may differ in voltage, current and which wire pairs carry power. Connecting incompatible equipment can prevent operation or damage a device. Verify the endpoint and PSE’s IEEE standard/type and class before connecting them. Ethernet Alliance describes these risks in its guidance on passive PoE. Ethernet Alliance PoE overview.
Ethernet Alliance certification is one way to identify products tested under its program plans: Gen 1 covers IEEE 802.3af/at, and Gen 2 covers IEEE 802.3bt-2018. Certification is not a prerequisite for every IEEE-compatible product, so its absence alone does not establish incompatibility. Ethernet Alliance PoE certification information.
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