Clinic Fit-Out: Power, Port and Licence Budget Conflicts

The integrator computed at the PD (powered device) and then ignored the shortfall. A PSE reserves power at the class maximum, not at the measured draw:

AP	Count	PD draw	Class	PSE reservation
AP4050DN	18	12.95 W	3	15.4 W → 277.2 W
AP7060DN	6	25.5 W	4	30.0 W → 180.0 W
Total	24			457.2 W

Even the PD-side arithmetic (386.1 W) exceeds the 370 W budget; the PSE-side reservation exceeds it by ~87 W. The 30 W per-port figure is fine - the problem is aggregate.

Observable symptoms:

• The switch powers APs in priority/port order until the budget is exhausted; the last APs (or the lowest-priority ports) stay unpowered and never appear on the AC at all - no CAPWAP, no fault record, because the AP is dead.
• If the budget is oversubscribed during a power dip or after a reload, APs may flap: the AC shows repeated online/offline transitions and display ap all shows state bouncing.
• Any AP7060DN that negotiates only 802.3af (for example because LLDP is disabled and the class is misread, or a midspan injector is af) boots in a reduced mode - typically USB disabled and/or the 2.4 GHz radio off or power-reduced - and the AC raises a power-insufficiency alarm. That directly breaks the ultrasound cart requirement.

So the correct reading is: aggregate budget fails, and the per-port class must be verified for the Wi-Fi 6 units.

Constraints: one AC (no budget for another), 24 APs, 370 W, 24 ports. There is no spare port, so a second switch is not purely optional if anything else needs a port.

Ordered remedy plan:

1. Split the PoE load. Add a second small PoE switch (or a PoE injector bank) for the 6 × AP7060DN. Removing 180 W of reservation drops the original switch to ~277 W for 18 APs - comfortably inside 370 W. This also gives port headroom. Cheapest reliable fix.
2. If a second switch is impossible, downgrade the imaging suite to AP4050DN-class units and accept the loss of Wi-Fi 6 features, or reduce AP count by re-planning coverage. Do not "accept" the 457 W reservation.
3. Verify class negotiation for every AP7060DN: confirm LLDP/CDP or 802.3at two-event classification is working and that the port is not capped below 30 W. Set explicit per-port maximum power only where the AP is known to run in reduced mode by design.
4. Fix licensing before cutover. The AC supports 16 APs; 24 will attempt to register. The 8 over-licence APs fail to come online even with perfect power. Either purchase the additional 8 AP licences or reduce the deployed AP count - but note that reducing APs to 16 will not meet coverage.

Apply power and licence fixes together before a commissioning test, otherwise you will be debugging two independent failure modes at once.

On the switch:

• Negotiated class and delivered power per port (PoE status output), confirming Class 4 / 802.3at and ~30 W reservation for the AP7060DN ports.
• LLDP or CDP adjacency to each AP; without it, class-based negotiation may still work but power-priority and fine-grained control are lost.
• Port power priority set so imaging-suite ports are highest, protecting them if the budget is ever stressed.

On the AC:

• display ap all - all 24 APs online, correct AP types, no repeated state changes.
• Power and alarm status per AP: no power-insufficiency or PoE alarm on the imaging APs.
• Radio status per AP: both 2.4 GHz and 5 GHz radios up at full configured power, no radio administratively down for power saving.

Accepted proof:

1. A 30-minute soak with all 24 APs powered, no AP reboot, no power alarm.
2. A throughput and latency test with the ultrasound cart associated to an imaging AP: expected 5 GHz MCS/rate consistent with full-power operation (not a capped low-rate state), no packet loss over 10 minutes, and latency stable.
3. A deliberate failure test: pull power from one non-critical AP and confirm the imaging APs are unaffected.

If any imaging AP comes up with a radio disabled or a power alarm, the design has failed regardless of what the port status says - the AP itself is the authority on whether it received enough power.