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A PoE device class identifies the power level a powered device (PD) needs or is assigned, helping a power sourcing equipment (PSE)—often a network switch—allocate power. A class is not the same as a PoE type: the type identifies a broader capability group under an IEEE PoE standard, while the class indicates a power level within that group.
What a PoE device class means
Power over Ethernet (PoE) carries electrical power and network data over Ethernet cabling. The PSE supplies power; the PD receives it. A PoE switch is a common PSE, while access points, cameras, phones, and other powered endpoints can be PDs.
The class number helps the PSE determine how much power to reserve for a connected PD. Cisco describes physical-layer classification and, where supported, Link Layer Discovery Protocol (LLDP) negotiation as ways equipment identifies or negotiates power needs. The class is therefore a power-allocation aid, not a device category such as “camera” or “access point.” Cisco’s PoE overview and its UPOE+ white paper describe these roles and methods.
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How PoE classes relate to types and standards
IEEE standards define broader PoE capability groupings commonly called types. Cisco’s summaries associate the classes with these families:
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- 𝗙𝘂𝗹𝗹 𝗚𝗶𝗴𝗮𝗯𝗶𝘁 𝟴-𝗣𝗼𝗿𝘁 𝗣𝗼𝗘 𝗖𝗼𝗻𝗳𝗶𝗴𝘂𝗿𝗮𝘁𝗶𝗼𝗻 - 8 PoEplus (802.3at/af) Gigabit RJ45 providing up to 30W per port and total PoE power budget of 65W. Up to 16 Gbps switching capacity.
- 𝗘𝘅𝘁𝗲𝗻𝗱𝗲𝗱 𝗣𝗼𝗘 𝗧𝗿𝗮𝗻𝘀𝗺𝗶𝘀𝘀𝗶𝗼𝗻 - Up to 820 ft PoE transmission distance with Extend Mode button on, perfect for surveillance camera deployment in large areas.
- 𝗣𝗼𝗘 𝗔𝘂𝘁𝗼 𝗥𝗲𝗰𝗼𝘃𝗲𝗿𝘆 - Automatically reboots your dropped or unresponsive PoE-powered devices with PoE Auto Recovery Mode on.
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| IEEE family and type | Associated classes | Maximum PSE output | Maximum power at PD |
|---|---|---|---|
| 802.3af, Type 1 (PoE) | 0–3 | 15.4 W | 12.95 W |
| 802.3at, Type 2 (PoE+) | 4 | 30 W | 25.5 W |
| 802.3bt, Type 3 | 5–6 | 60 W | 51 W |
| 802.3bt, Type 4 | 7–8 | 90 W | 71 W |
These are maximum capability figures in Cisco’s technical summaries, not a promise that a particular endpoint will receive that much power. PSE output is the power supplied by the source; the PD figure is the maximum available to the powered device. The difference matters when checking whether an endpoint’s input requirement can be met. Cisco documents the Type 1 and Type 2 figures in its Digital Building Solution Partner Guide and the Type 3 and Type 4 figures in its UPOE+ white paper.
What the individual class numbers indicate
Cisco’s Catalyst configuration guide lists the following class maxima as switch-side allocation levels. They are not the guaranteed amount of power delivered at the PD:
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- [Flexible Full Gigabit 5-Port PoE Configuration] 4x PoE+ (802.3at/af) 10/100/1000 Mbps RJ45 ports providing up to 30W per port and total PoE power budget of 65W, together w/ 1x Gigabit Non-PoE Port for high-speed connections.
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| Class | Maximum PSE allocation in Cisco’s guide |
|---|---|
| 0 | 15.4 W |
| 1 | 4 W |
| 2 | 7 W |
| 3 | 15.4 W |
| 4 | 30 W |
| 5 | 45 W |
| 6 | 60 W |
| 7 | 75 W |
| 8 | 90 W |
Class 0 is the default or unclassified allocation in Cisco’s descriptions. Classes 1–3 represent lower power levels, and classes 4–8 correspond to the higher type groupings shown above. The guide’s values are allocation maxima; consult the PD’s data sheet for its actual power requirement. See Cisco’s PoE configuration guide.
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A PSE’s output ceiling is not the same as the power available at the PD. For example, Type 2 allows up to 30 W at the PSE and up to 25.5 W at the PD in the cited Cisco summaries. When matching a switch to an endpoint, compare the endpoint’s stated power need with the PD-side figure, not just the switch’s headline per-port output.
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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.
Nor does a higher-rated switch automatically send maximum power to every connected device. The amount allocated depends on detection and classification or negotiation, the switch’s available total PoE budget, and the equipment and cabling implementation.
How to check whether a PoE class will work
- Read the endpoint specifications. Find its required IEEE standard or type, class if listed, and power requirement at the PD. Do not rely on a class number alone if the manufacturer also specifies a wattage or compatibility condition.
- Check the switch’s per-port rating. Confirm its supported standard/type and maximum PSE output for the port, then check that the endpoint’s PD-side requirement is supported.
- Check the switch’s total PoE budget. A switch may support a given output on an individual port but lack enough total power for all ports to operate at their planned levels simultaneously.
- Confirm negotiation and compatibility. Verify any required LLDP support and check the switch and endpoint documentation for restrictions. Cisco notes that some Type 4 PDs can be power-demoted when connected to a Type 3 PSE, and that certain legacy devices have compatibility caveats with Type 4 PSEs. See Cisco’s Catalyst 9200 PoE guide.
PoE names that can cause confusion
802.3af is commonly called PoE, 802.3at is PoE+, and 802.3bt covers later four-pair PoE capabilities. Cisco’s configuration guide calls Type 3 “PoE++” and Type 4 “4PPoE,” but informal use of “PoE++” is inconsistent. For precise compatibility discussions, state the IEEE standard, type, and class where known rather than relying on an informal label.
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- 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
Cisco UPOE is a separate, Cisco-proprietary technology—not an IEEE device class. Cisco describes it as providing up to 60 W at the PSE and 51 W at the PD; do not treat that proprietary label as interchangeable with an IEEE class or type.
Quick Recap
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- GIGABIT ETHERNET PORTS: Features 5 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 4 PoE+ ports with a 63W total power budget, plus dynamic PoE allocation that redistributes unused power to support more connected 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.
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