Make a powered-port worksheet first
List every device, link speed, PoE class or stated maximum input, and whether it must survive a switch reboot. Add startup and future-device headroom instead of multiplying the port count by a marketing maximum. A switch with eight PoE sockets can still be the wrong choice when its shared power supply cannot support the intended combination.
Keep per-port speed separate from uplink capacity
A 2.5GbE access point can exceed one gigabit only under favorable radio, client, and workload conditions, but several active ports can still overwhelm a single gigabit uplink. Draw the path to the router, NAS, and aggregation switch. Pay for 10GbE uplinks only when the rest of that path and the repeated traffic justify them.
Choose management for an operating task
VLANs, link aggregation, traffic counters, and remote PoE cycling are useful when the network plan names who will configure them and how access is recovered. A controller-managed model may also operate in a reduced standalone mode. Read the exact manual before assuming cloud, local web, command line, or third-party automation support.
Plan fan noise, heat, and rack power together
High-output PoE switches can use active cooling even when ordinary multi-gig switches are silent. Check acoustic location, front-to-back clearance, rack depth, ambient temperature, surge protection, UPS runtime, and cable bend radius. A closet that is visually tidy but thermally closed is not a complete installation.
When separate injectors are the better answer
Keep the existing multi-gig switch and add standards-compliant injectors when only one or two devices need power, silence is important, or replacing a large working switch adds cost without a clear traffic benefit. Skip multi-gig PoE entirely when every powered endpoint is gigabit and no planned workload needs the faster link.