Cisco Aironet AIR-AP1840I-x-K9
Listing Title
Cisco Aironet AIR-AP1840I-x-K9 802.11ac Wave 2 Dual-Band Indoor Wireless Access Point, Built-in Omni Internal Antennas, 4×4 MU-MIMO 5GHz Radio, Integrated BLE 4.2, Dual Gigabit Ports, Supports CAPWAP Controller Mode; K9C Variant Supports Mobility Express Standalone DeploymentCisco
Full Commercial Product Description
The Cisco Aironet AIR-AP1840I-x-K9 belongs to the enterprise-class Cisco Aironet 1840 Series indoor wireless access points, engineered for small-to-medium businesses, corporate branch offices, educational campuses and retail venues with high concurrent client demandsCisco. Two firmware variants are available: the standardAIR-AP1840I-x-K9operates exclusively in CAPWAP centralized controller managed mode, compatible with Cisco Catalyst 9800, 5520, 8540 physical WLCs and virtual wireless controllers; theAIR-AP1840I-x-K9Cvariant is preloaded with Mobility Express software to run as a standalone virtual wireless controller for networks without dedicated WLC hardwareCisco.
Compliant with IEEE 802.11a/b/g/n/ac Wave 2 (Wi-Fi 5) standards, the AP runs two independent concurrent radios for simultaneous 2.4 GHz and 5 GHz coverage with asymmetric MIMO architectureCisco:
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2.4 GHz Radio: 2×2 SU-MIMO with 2 spatial streams, supports 20MHz channel bandwidth
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5 GHz Radio: Industry-leading 4×4 MIMO, delivering 4 spatial streams for SU-MIMO and 3 spatial streams for MU-MIMO, supporting 80MHz wide channels, with a peak combined dual-band PHY throughput up to 1733 Mbps to handle HD video, cloud collaboration and mass mobile device connections.
This model adopts fully integrated internal omnidirectional dual-band antenna arrays without external RTNC antenna ports, consisting of dedicated 2.4GHz and 5GHz internal antennas with peak gains of 4 dBi (2.4GHz) and 5 dBi (5GHz), providing uniform wide-area indoor RF coverage and eliminating messy external antenna cabling for clean ceiling or wall installationCisco. An embedded Bluetooth Low Energy (BLE 4.2) radio is built into the chassis, supporting location beaconing, asset tracking, wayfinding and proximity marketing applications without separate external BLE sensorsCisco.
Core Cisco RF optimization technologies are fully integrated to deliver stable, high-density wireless performance: Transmit Beamforming strengthens signal strength and eliminates coverage dead zones; BandSelect automatically steers dual-band capable clients away from congested 2.4GHz to the cleaner 5GHz band; Radio Resource Management (RRM) dynamically adjusts radio channels and transmit power across the entire wireless domain; built-in rogue AP detection identifies unauthorized rogue wireless hotspots to reinforce enterprise network security boundariesCisco. The platform also supports Cisco DNA Center wireless analytics, capturing over 240 network anomalies and granular Wi-Fi performance metrics for network troubleshooting and capacity planningCisco.
Hardware Interfaces & Power Specifications
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2 × 10/100/1000BASE-T auto-sensing Gigabit RJ45 ports, both support IEEE 802.3af/at PoE input
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1 × RJ45 RS-232 local console port for device configuration and troubleshooting
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1 × USB 2.0 auxiliary port; note that the USB port is automatically disabled when powered by 802.3af PoE, and only enabled under 802.3at PoE+ / UPOE power supplyCisco
Power Supply Compatibility:
IEEE 802.3af PoE, IEEE 802.3at PoE+, Cisco UPOE, AIR-PWRINJ5 (af injector), AIR-PWRINJ6 (at injector)
Power consumption: 13.2W PSE draw (all features enabled except USB); 17.8W PSE draw (USB port activated)Cisco
Environmental & Physical Parameters
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Operating temperature range: 0°C ~ 50°C (32°F ~ 122°F)
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Storage temperature range: -30°C ~ 70°C (-22°F ~ 158°F)
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Operating humidity: 10% – 90% non-condensing
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Physical dimension: 7 × 7 × 1.5 inches; weight only 0.43kg (0.94 lbs), lightweight low-profile square chassis
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Mounting compatibility: Standard ceiling rail flush/recessed mounting, wall bracket mounting, compatible with AIR-AP-BRACKET-8 mounting kit and ceiling grid clipsCisco
Comprehensive enterprise-grade security suites are fully supported: WPA/WPA2 encryption with AES algorithm, 802.1X port-based AAA authentication, multiple EAP authentication protocols, 802.11r fast roaming for seamless VoIP voice call handoff, VLAN traffic segmentation and WMM QoS mechanism to prioritize voice, video and core business data traffic. It also supports MAC address filtering, dynamic frequency selection (DFS), A-MPDU/A-MSDU packet aggregation for improved airtime efficiencyCisco.
The suffix "x" in the part number represents different global regional regulatory domains (A, B, C, K, S, H etc.) to comply with local radio frequency spectrum regulatory standards worldwide.
Key Specification Bullet Points
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Model: AIR-AP1840I-x-K9
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Wi-Fi Standard: IEEE 802.11a/b/g/n/ac Wave 2 (Wi-Fi 5)
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Radio Architecture: Concurrent dual-band 2.4 GHz + 5 GHz, integrated BLE 4.2 beacon radio
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MIMO Technology: 2×2 SU-MIMO (2.4GHz, 2 spatial streams); 4×4 MIMO (5GHz, 4 SU spatial streams / 3 MU spatial streams); total max PHY throughput 1733 Mbps
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Antenna Type: Built-in integrated internal omnidirectional dual-band antennas, no external antenna ports; gain: 4dBi (2.4GHz), 5dBi (5GHz)
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Core RF & Analytics Features: Transmit Beamforming, BandSelect, RRM Radio Resource Management, Rogue AP Detection, Cisco DNA Center Wireless Analytics
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Operation Mode: Standard K9: CAPWAP Controller-Managed Centralized Mode; K9C variant: Mobility Express standalone virtual controller support
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Interfaces: 2 × Gigabit RJ45 PoE Uplink Ports, 1 × RJ45 RS-232 Console Port, 1 × USB 2.0 Auxiliary Port (disabled under 802.3af PoE)
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Power Input: IEEE 802.3af PoE, 802.3at PoE+, Cisco UPOE, AIR-PWRINJ5 / AIR-PWRINJ6 power injectors
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Operating Environment: Indoor standard climate; Operating Temp: 0°C ~ 50°C; Storage Temp: -30°C ~ 70°C
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Security Suite: WPA/WPA2, AES, 802.1X, multi-EAP, 802.11r fast roaming, VLAN isolation, WMM QoS, DFS, packet aggregation
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Physical Specs: Weight 0.43kg; dimension 7 × 7 × 1.5 in
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Mounting: Ceiling rail flush/recessed mount, wall bracket mount (AIR-AP-BRACKET-8 compatible)
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Typical Application: SMB offices, K-12 & higher education classrooms, retail stores, medium-to-high density indoor enterprise wireless deployments
Model Quick Reference
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AIR-AP1840I-x-K9: Standard CAPWAP-only indoor AP, internal omnidirectional dual-band antennas
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AIR-AP1840I-x-K9C: Dual-mode configurable AP preloaded with Mobility Express standalone virtual controller software
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1815 Series: Entry-level 2×2 MIMO APs with lower throughput compared to 1840I
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1832 Series: Mid-tier 3×3 MIMO platform, inferior 5GHz radio performance versus 1840I’s 4×4 MU-MIMO
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