AIR-AP1840I-K-K9 Cisco Aironet 1840I Indoor 4x4:4 MU-MIMO Access Point

AIR-AP1840I-K-K9 K-Domain Procurement Record

AIR-AP1840I-K-K9 identifies the K regulatory-domain Aironet 1840 with internal antennas and controller-based software ordering. The K suffix is a radio-compliance boundary, not an interchangeable inventory attribute.

K-domain published spectrum

Cisco lists thirteen 2.4 GHz channels from 2.412 to 2.472 GHz. Its 5 GHz table has eight channels at 5.180-5.320 GHz, seven at 5.500-5.620 GHz and four at 5.745-5.805 GHz. The final site remains subject to the current Cisco compliance lookup and local rules.

Network integration facts

The hardware supports 4x4 downlink MU-MIMO with four spatial streams at 5 GHz and 2x2 operation at 2.4 GHz. It exposes two Gigabit Ethernet ports and can use 802.3at, Cisco UPOE or 802.3af. Under 802.3af, Cisco states that the USB port is disabled.

Do not infer standalone software

The -K9 record differs from the -K9C Mobility Express ordering form. Capture the target WLC model and release, AP image, country code, CAPWAP join result, RF channel set and power negotiation as commissioning evidence.

Support horizon

End of sale was 30 April 2022. Hardware support ends 30 April 2027, with the final service-contract renewal milestone on 27 July 2026. Procurement needs an entitlement check and a dated Catalyst 9115AX migration plan rather than an assumption of open-ended support.

AIR-AP1840I-F-K9 and AIR-AP1840I-H-K9 are separate regulatory records even though their enclosure and base radio architecture are similar.

Official evidence: Cisco K-domain channel and hardware data, Cisco wireless software compatibility matrix, Cisco service milestones and migration notice and Cisco deployment approval lookup.