Your school’s Wi-Fi probably crashes during exam week, and it’s not the access points causing it. The real culprit sits quietly in your wiring closet, and most IT teams are sizing it completely wrong. Here’s what actually matters.
Access points get most of the attention during a Wi-Fi upgrade, but the PoE switch sitting in the wiring closet is the one quietly deciding whether the network stays solid through exam week or falls apart during a 9 AM online test. Get the switch right and a single Ethernet cable delivers both power and data to every AP in the building - no electrician, no outlet hunting. Get it wrong and APs reboot under load, throttle their radios, or never reach full speed.
Most Wi-Fi problems that feel like access point issues are actually switch problems in disguise - an undersized PoE budget, a missing managed feature, or a bottlenecked uplink. That distinction matters because buying a second AP never fixes a power-starved switch. The switch has to be sized correctly from the start, which means understanding a few specific numbers before anything goes in a rack.
Telecom Depot Direct supplies networking hardware for Canadian schools and organisations, and the guidance below draws on the same criteria their technical team uses to size switches for real deployments - port count, power budget, PoE standard, and uplink speed.
Power over Ethernet (PoE) sends electrical power and network data down a single standard Ethernet cable. For schools, this means access points can be installed in ceilings, gym rafters, stairwells, and outdoor breezeways - anywhere there is a network drop - without needing a nearby power outlet. That eliminates the cost of additional electrical wiring and lets APs go where coverage is actually needed, rather than where an outlet happens to exist. A well-designed deployment can enable a clean three-tier network architecture, with PoE+ switches powering both IP cameras and APs across an entire building from a single infrastructure layer.
Because the switch is the power source, plugging it into an Uninterruptible Power Supply (UPS) extends battery backup to every PoE-powered device connected to it. During a brief power interruption, the entire floor of Wi-Fi stays up - students mid-exam do not lose their connection. That resilience benefit cannot be replicated when each AP has its own wall adapter.
Every PoE device negotiates a power class with the switch when it connects. If the switch cannot deliver what the AP requests, the AP either throttles its radios or reboots. There are three IEEE standards to know:
Standard Common Name Max Per-Port Power Typical Use 802.3af PoE ~15.4 W Older/basic APs, VoIP phones 802.3at PoE+ ~30 W Most Wi-Fi 6 / 6E access points 802.3bt PoE++ (Type 3/4) ~60-90 W High-end Wi-Fi 6E/7 APs, PTZ cameras
PoE+ is the right starting point for nearly every school Wi-Fi deployment today. Most Wi-Fi 6 access points draw between 20-25W at full load, which fits comfortably within the 30W ceiling. The important caveat: running a Wi-Fi 6 AP on the older 802.3af standard (15.4W) can cause it to disable MIMO streams or drop a radio band entirely - a performance hit that is easy to misdiagnose as a coverage problem. PoE+ avoids that trap.
High-end Wi-Fi 6E access points with tri-band radios and 4x4:4 MIMO configurations can draw up to 45W. Flagship Wi-Fi 7 APs with multi-gig radios can push higher still. For these devices, PoE++ (802.3bt) - delivering up to 60-90W per port - is the only standard that allows the AP to run at its full advertised specification. Always check the AP datasheet before assuming PoE+ is sufficient for newer flagship hardware.
Count every PoE device: APs, IP cameras, door controllers, IoT sensors. Then add 25-30% headroom for devices added in the next budget cycle. A 24-port switch realistically handles 16-18 APs comfortably while leaving ports free for growth. Running a switch at 100% port utilisation from day one is a common mistake that can lead to premature and unplanned upgrades.
This is the most frequently missed specification in school network purchases. A switch labelled "24-port PoE+" might carry a total PoE budget of only 370W. If 18 APs each draw 25W under load, that is 450W - the switch is already over budget before cameras or any other PoE device is added. The per-port wattage figure tells only part of the story; the aggregate budget is what actually limits the deployment.
SFP and SFP+ ports accept fibre transceivers that connect access switches to the core and link buildings together over distance - far more reliable than long copper runs. As Wi-Fi 6E and Wi-Fi 7 APs push multi-gigabit wireless throughput, a 1G SFP uplink becomes the new bottleneck. Schools investing in next-generation APs should prioritise switches with SFP+ (10G) uplinks to ensure the wired backbone keeps pace with the wireless layer.
The calculation is straightforward: multiply the number of APs by their real power draw at full load, then add 25% overhead. That buffer accounts for power spikes during boot cycles, cold temperatures affecting efficiency, and any additional PoE devices added later.
Number of APs Draw at ~20W Each With 25% Headroom 8 APs 160 W ~200 W 16 APs 320 W ~400 W 24 APs 480 W ~600 W 48 APs 960 W ~1,200 W
If the APs are Wi-Fi 7 flagship models drawing closer to 30W, scale every number up accordingly. An undersized PoE budget is the single most common cause of random AP dropouts - the kind that are notoriously hard to trace because the switch itself keeps operating normally.
For any network serving students, managed or smart-managed switches are the only appropriate choice. Unmanaged switches move traffic - that is it. Managed switches provide the tools that school networks specifically require:
Managed switches are standard in enterprise, government, and healthcare networks for exactly these reasons - and a school network managing hundreds of student devices faces the same security and segmentation requirements.
The right switch depends on the scale of the deployment. A small school with a handful of APs has genuinely different needs from a large secondary school wiring multiple buildings. A practical starting framework:
For buildings where a single power supply failure would take down a full floor of Wi-Fi, pairing a higher-end managed switch with a redundant power supply is worth the additional investment - particularly ahead of exam periods.
The time to discover a PoE budget shortfall is not during a province-wide standardised test with 300 students on the network. Sizing the switch correctly - port count with headroom, total PoE budget with overhead factored in, the right PoE standard for the APs deployed, and uplink speeds matched to Wi-Fi generation - is straightforward when done methodically before procurement.
A brief PoE budget calculation takes less than ten minutes and prevents the kind of intermittent connectivity issues that take days to diagnose correctly. Do the arithmetic once, confirm it against the switch published spec sheet, and the network will hold up when it needs to most.
Browse the full range of PoE switches, transceivers, and networking hardware at Telecom Depot Direct - a Canadian-owned supplier with expert technical support and fast shipping across Canada for schools building reliable, scalable networks.
