AIR-AP1852E-Q-K9 Cisco Aironet 1852e 4x4 MIMO Access Point

AIR-AP1852E-Q-K9 exact order identity

AIR-AP1852E-Q-K9 is a 1852e indoor access point for separately purchased external antennas in the Cisco Aironet 1850 Series. This exact SKU combines regulatory-domain token Q with a single-unit fixed-domain K9 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 states that external antennas are sold separately and certifies the platform for antenna gains up to 6 dBi at both 2.4 and 5 GHz. Record the approved Cisco antenna part numbers, four radio paths, gain, pattern, cable loss, connectors and mounting orientation. A compatible connector alone is not regulatory or RF-design evidence.

Order and controller boundary

Cisco lists K9 as a controller-based dual-band 802.11ac Wave 2 order. Match the complete fixed-domain PID at receiving. Create one serial-level asset record and stage CAPWAP join, controller software, country setting and radio operation before production release.

Q regulatory-domain evidence

Cisco lists this profile as 2.4 GHz channels 1-13; 5 GHz blocks at 5.180-5.320 and 5.500-5.700 GHz. The Q profile provides lower and continuous middle 5 GHz blocks without the upper block listed for some domains. Capacity and interference planning should use those two groups only. Export the lower and middle channel sets from the target controller and compare them with the Q-domain survey. Escalate an upper-band dependency before the purchase is released.

Procurement inference: the absence of a listed upper block means that lower and middle spectrum must carry the intended design. Before purchase, confirm that survey capacity and neighboring deployments do not depend on upper-band separation. During acceptance, record utilization in both available groups and document any controller policy that further narrows them. A different domain's three-group template is not suitable substitution evidence.

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

Ethernet and cabling proof

Preserve the permanent-link test, patch-lead identities, switch port, negotiated Ethernet rate and error counters. Investigate pair faults, excessive length or rate fallback before wireless acceptance begins. A link light only proves connectivity at some rate; it does not demonstrate the intended uplink performance. Tie the cable result to the AP serial so a later throughput problem can be separated from radio, controller and wired-path causes. The platform has one PoE Gigabit interface and one Gigabit AUX interface used for link aggregation, so preserve both link states and the power condition under which AUX is available.

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.

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.

Quotation substitution gate

Compare antenna form, regulatory token, configuration suffix, pack quantity and complete Cisco part number on the authorized quotation. Treat any changed token as a substitution that requires a new technical and regulatory review. Procurement should not accept a different access-point order merely because the family name matches. Preserve the approved line, received label and exception decision so the final asset can be traced to the exact order reviewed here. A K9, K9C, K910, K910C, antenna-form or regulatory-token change is a different 1852 procurement line and must not be accepted as a cosmetic substitution.

Authentication path test

Commission representative clients through association, authentication, address assignment, DNS and application reachability. Preserve the identity policy used, test client type, result and relevant controller logs. An access point that joins its controller has not yet demonstrated the user path. Repeat the test after any controller, certificate or authentication-service change and retain failures separately from RF or switch-port evidence. Test the complete user path after the 1852 joins; the controller relationship alone does not prove client authentication, DHCP, DNS or application reachability.

Roaming acceptance

Define the neighboring access points and client types used for roaming validation. Record handoff behavior, interruption observed, authentication result and controller events along the intended movement path. Compare the outcome with the site's design target rather than declaring success from static association. Where this unit replaces an older AP, test both entry and exit from its cell so a local improvement does not hide a boundary problem. When replacing a neighboring legacy AP, preserve roaming evidence in both directions and compare it with the 1852's installed radio and channel state.

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.

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-AP1852I-Q-K9C - compare antenna form and domain evidence.
• AIR-AP1852I-Q-K9 - compare antenna form and domain evidence.
• AIR-AP1852I-SK910C - 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.