Camera networks where the PoE budget, per-port power data and the recorder uplink decide whether the site stays up on a summer evening.

A cold-storage operator wanted cameras inside freezer rooms at −25 °C but could not put electronics there. The design kept PoE switches in the warm corridor and ran hardened cabling to the camera positions.
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A gated estate with six blocks needed 64 cameras, gate intercoms and barrier control, using a fibre backbone between blocks and existing coax where new cable was impossible.
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A district ran 120 cameras from a mix of small unmanaged switches, and the recorder room could not tell which camera had failed. Fourteen intersection cabinets now carry the PoE, two aggregation switches feed the recorders over 10G, and a power budget per port makes an outage traceable.
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