Switch Power Consumption – Understanding It Through Our 24-port PoE Switch

Power over Ethernet (PoE) switch dramatically cuts network costs while improving power efficiency – with which network managers can get simultaneous access to both power and data over a single Ethernet cable. PoE network switches come in a host of flavours, such as 8/12/24/48-port PoE switches, or unmanaged and managed PoE switches. 24-port PoE switch is considered a cost-effective alternative for SMB networks, for it enables enough output capacity for SMB network flow with relatively lower power consumption. As people tend to be cautious about the power consumption of network switches, here we provide some indication of 24-port switch power consumption.

What Is PoE Switch Power Consumption?

Network administrators nowadays are more inclined to incorporate PoE switches into their network, anticipating reducing the hassle of connecting equipment to a power supply. Moreover, the PoE switch also significantly decreases the number of cables needed and is ideal for network upgrades. To understand 24-port PoE network switch power consumption, let’s first get some insight into the two most relevant PoE standards denoting power output: 802.3af and 802.3at. The older 802.3af provides 15.4 watts of power, serving as the standard for PoE switch, whereas the newer 802.3at standard – known as PoE+, enables up to 30 watts of power. But as we plug cable into the PoE port, power losses occur, and the level of loss heavily depends on the cable length – the longer the cable is, the more the loss can be. So the minimum output power guaranteed for the PoE switch is 12.95 watts and 25.5 watts for the PoE+ switch.

24-port poe switch power consumption

24-port Switch Power Consumption: How Many Devices Can I Connect to My Switch?

To better illustrate the answer, we should first obtain some knowledge about two essential components of PoE switch:

Power Sourcing Equipment (PSE): like switches or hubs, it comes with a predetermined Total PoE Budget.

Powered Devices (PDs): these are elements connected to PoE switches, such as IP cameras, WAPs, and VoIPs. They also come with a variety of different wattage demands. Note that the total sum of their demands must be less than the PSE’s total PoE budget.

So, we’ve made things clear, to define how many devices you can link to a 24-port Gigabit PoE switch, you should consider at least two factors: how much power your 24-port Gigabit PoE network switch can provide, and how much power your PoE-enabled devices need.

For a 24-port PoE switch, you should look for its “PoE Budget” or “Power Dedicated to PoE” value, which is the total amount of power the switch has that can be divided between PoE devices connected to it. For instance, a 24-port PoE switch based on 802.3af has a total PoE budget of 300 watts. When used at full capacity, the maximum power consumption per port would be 300/24 ports or 12.5 watts per port. Since 802. af PDs offer a maximum of 15.4 watts of power, the remaining power will stay as unused and will not overpower PDs. To calculate how many PoE-enabled devices the 24-port PoE switch supports, simply divide the total PoE budget ( in this case 300 watts ) by 15.4 watts.

FS 24-port PoE Switch: The Answer to Build a Reliable Enterprise Network

Among the dazzling array of 24-port PoE switches out there on the market, FS 24-port PoE managed switch is a managed Gigabit switch that offers an economical option for enterprise, midmarket, and brand office networks. With 24 Gigabit Ethernet RJ45 ports and 4 SFP ports (2 combo ports and 2 SFP ports), an advanced Layer 2+ feature, and 802.3af compliant, this 24-port PoE switch enables you a secured, sustainable, and optimised network performance, simplifying the installation and power management of network devices such as WAPs, VoIP phones and surveillance. Besides, the FS 24-port PoE managed switch also greatly increases energy efficiency to meet various network requirements.


24-port PoE switch, as a cost-effective choice for simplifying network deployment and maintenance, is gaining in much popularity these days. When referring to the switch power consumption of this device, just take this two-step guidance: figure out the watts each PoE-enabled device will use, then multiply the watts used by the amount of devices for your total watts. Remember that the total watts should never exceed the total power budget of the 24-port PoE switch.

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