AIR-AP1852I-N-K9C Cisco Aironet 1852i MU-MIMO Access Point

AIR-AP1852I-N-K9C exact order identity

AIR-AP1852I-N-K9C is a 1852i indoor access point with integrated omnidirectional antennas in the Cisco Aironet 1850 Series. This exact SKU combines regulatory-domain token N with a single-unit configurable K9C order. The platform is a dual-band 802.11ac Wave 2 access point with four 5 GHz spatial streams in single-user operation and three in multiuser operation.

Antenna and environmental boundary

Cisco rates the internal antenna system at 3 dBi for 2.4 GHz and 5 dBi for 5 GHz, with 360-degree horizontal beamwidth. No external antenna is selected by this SKU. Preserve enclosure orientation, bracket, mounting height and post-install coverage because placement determines how the integrated pattern is used.

Order and controller boundary

Cisco lists K9C as a configurable controller-based order, and its lifecycle table describes affected K9C lines as Mobility Express products. Retain the final domain and software role on the quotation and received unit. Prove the intended controller or Mobility Express state instead of inferring it from the suffix alone.

N regulatory-domain evidence

Cisco lists this profile as 2.4 GHz channels 1-11; 5 GHz blocks at 5.180-5.320 and 5.745-5.825 GHz. The N profile pairs an eleven-channel 2.4 GHz plan with separated lower and upper 5 GHz blocks. The 2.4 GHz boundary is part of the order's deployment evidence, not merely a 5 GHz consideration. Check both radio bands against the N-domain record. Preserve the controller country setting, 2.4 GHz channel limit and the two 5 GHz groups with the site acceptance report.

Procurement inference: this profile combines an eleven-channel 2.4 GHz boundary with separated lower and upper 5 GHz choices. Validate both bands in the same commissioning record; a correct 5 GHz result does not prove that the 2.4 GHz plan is appropriate. When a design uses 2.4 GHz for legacy or operational clients, retain a specific association and interference test for that population.

Power and interface boundary

The 1852 provides a PoE Gigabit uplink and a Gigabit AUX port for link aggregation. Cisco states that 802.3af disables AUX and USB on both antenna forms and reduces the 1852e 2.4 GHz radio from 3x4 to 2x3. Record negotiated power before promising the complete interface and radio state.

Deployment evidence worksheet

Power-state acceptance

Measure power after the access point has joined its controller and the planned radios and services are active. Record switch model, port, negotiated power level, LLDP result and any reduced-capability warning. An idle boot result is not sufficient evidence for the deployed power budget. If an injector is proposed, verify its supported use and include its exact identity in the maintained bill of materials rather than treating it as an unspecified accessory. The 1852 draws up to 20.9 W; 802.3af also disables AUX Ethernet and USB, while the external-antenna 1852e reduces its 2.4 GHz radio from 3x4 to 2x3.

Survey-to-install reconciliation

Attach the approved RF survey location, mounting height, orientation, expected client density, channel width and neighboring-radio assumptions to the order. After installation, compare measured coverage and interference with that design. If ceiling construction, antenna placement or obstructions changed, document the deviation and repeat the affected measurements. This provides a site-specific acceptance reason for the exact unit instead of relying on a family data sheet alone. Relate the survey result to the 1852's 4x4:4 single-user and 4x4:3 multiuser 5 GHz design rather than treating the published 1.7 Gbps PHY rate as measured site throughput.

Mechanical installation record

List the bracket, ceiling or wall interface, enclosure requirement, safety restraint, service clearance and cable-entry plan before scheduling installation. Receiving should identify missing mechanical items before the access point reaches site. Photograph the mounted label and final cable entry, then record how the unit can be reached for replacement. A complete electronic order can still be an unusable deployment kit when mechanical dependencies are omitted. The 1852i and 1852e have different operating-temperature ranges, and an external-antenna deployment also requires a complete cable and mounting bill of materials.

Country approval retention

Save the Cisco compliance lookup result, lookup date, deployment country, approved regulatory token and reviewer. If the destination changes, stop and repeat the approval rather than moving the unit on the strength of an earlier purchase. Compare the controller country setting and available channels with the retained evidence. Regulatory eligibility is a deployment condition and cannot be inferred from connector fit, stock location or a similar-looking part number. Cisco explicitly makes the customer responsible for country approval; retain the lookup alongside the 1852's controller country and enabled-channel evidence.

Monitoring handover

Assign owners for AP reachability, controller join failures, radio utilization, client health and switch-port errors. Confirm that the exact serial appears in inventory and monitoring, then test the alert path. Record dashboard object, notification route and escalation owner. Telemetry that is not tied to an owned asset does not provide a reliable service baseline and will not support later comparison after channel or software changes. Monitoring should identify the 1852 serial, controller object, both Ethernet interfaces, radio health and the team responsible for end-of-support migration.

Change-window controls

Document staging evidence, production window, installer, rollback owner and measurable success criteria. Preserve the prior controller or AP state needed for recovery. After the change, close temporary credentials, compare authentication, monitoring and RF results with the approved baseline, and record the final decision. The work is not complete merely because the unit powers on or appears in a controller list. Rollback must account for controller image alignment, country configuration and any Mobility Express primary role, not only the physical swap.

Interference baseline

Preserve the pre-install and post-install noise, neighboring-radio and channel-occupancy observations for the selected location. Record any controller-driven channel change during acceptance. If the regulatory profile limits the channel choices, state how that constraint affected reuse and mitigation. This baseline gives future troubleshooting a reference point and prevents an unrelated interference change from being attributed to the hardware order. The 1852 domain table varies materially by token, so preserve interference observations against the exact enabled-channel list rather than a generic country template.

Replacement dependency map

Map this unit to controller, licenses, authentication services, switch power, cable, bracket, antenna design and monitoring objects. For an end-of-sale platform, state which dependencies can be reused by the planned Catalyst migration and which require change. A nominal access-point replacement can fail when the surrounding platform was never inventoried. Keep the map with the asset rather than only in a one-time project file. Cisco names the Catalyst 9115AX family as the migration option in the lifecycle bulletin; map controller, power, cabling, mount and antenna changes before replacement.

Lifecycle decision

Cisco ended sale of the Aironet 1850 Series on 1 May 2022, ended software maintenance on 1 May 2023 and lists 30 April 2027 as the last support date. Cisco identifies Catalyst 9115AX as the migration family. Available inventory does not extend those milestones.

Related Aironet 1852 order records

• AIR-AP1852E-N-K9 - compare antenna form and domain evidence.
• AIR-AP1852I-N-K9 - compare order form and domain evidence.
• AIR-AP1852E-EK910C - compare antenna form and domain evidence.

Official evidence: Cisco Aironet 1850 Series data sheet; Cisco Aironet 1850 hardware guide; Cisco Aironet 1850 lifecycle bulletin; and Cisco wireless compliance tool.