REFURBISHED
Cisco
Cisco AIR-CT3504-K9 Refurbished — 802.11ac Wave 2 Wireless LAN Controller
MPN: AIR-CT3504-K9
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Lifetime
Warranty
ISO 9001
Certified Testing
R2v3
Responsible Refurb
25+
Years
5K+
Customers
ISO
Certified
✓
Tested
Every WhaleyComm unit is professionally tested, reset to factory defaults, and certified by our in-house engineers — the same standard trusted by 5,000+ organisations across 25 years. Not a refurb marketplace. A certified lifecycle partner.
Professionally tested and reset to factory defaults. Backed by 25 years of enterprise trust.
This refurbished Cisco AIR-CT3504-K9 3504 Wireless LAN Controller ships professionally tested and reset to factory defaults, giving your team a fully validated 802.11ac Wave 2 platform at a fraction of new-unit cost. The 3504 supports up to 150 access points and 3,000 concurrent clients with up to 4 Gbps system throughput, making it a capable centralized controller for small to medium-sized enterprise campuses, branch offices, and space-constrained deployments.Built around Cisco Multigigabit Ethernet technology, the AIR-CT3504-K9 delivers a 1x Multigigabit Ethernet port (up to 5 GbE) alongside four 1 GbE RJ-45 data ports, a dedicated service port, and a redundancy port for high-availability configurations. Its Cavium CN7240 8-core 1.5 GHz network processor, 8 GB DDR4 memory, and 32 GB eMMC bulk flash provide the horsepower for Cisco AVC with NBAR2 deep packet inspection, Cisco CleanAir RF optimization, TrustSec software-defined segmentation, embedded BYOD policy enforcement, and full Cisco DNA / SD-Access Wireless readiness — all from a quiet 1RU desktop or rack-mountable chassis.
At $335, this unit represents significant savings versus new list pricing on a platform that remains proven in thousands of production wireless networks. WhaleyComm's ISO 9001, R2v3, and e-Stewards certified refurbishment process ensures every port, interface, and firmware image has been verified before the unit leaves our facility — and our Lifetime Warranty covers you if anything ever changes.
Technical Specifications
Brand
Cisco
Model
3504 Wireless Controller
Part Number
AIR-CT3504-K9
Condition
Refurbished
Wireless Standard
IEEE 802.11ac Wave 2
Maximum Access Points
150
Maximum Clients
3,000
System Throughput
4 Gbps
Processor
Cavium CN7240 8-core, 1.5 GHz
Memory (RAM)
8 GB DDR4
Boot Flash
8 MB SPI NOR Serial
Bulk Storage
32 GB eMMC
Multigigabit Ethernet Port
1x (up to 5 GbE, RJ-45)
GbE Data Ports
4x 1000Base-T RJ-45
Service Port
1x GbE RJ-45
Redundancy Port
1x GbE RJ-45
Console Ports
1x RJ-45, 1x Mini-USB
USB Port
1x USB 3.0
Form Factor
1RU Desktop / Rack-Mountable
Dimensions
1.73 x 9.5 x 8.5 in
Operating Temperature
32°F to 104°F (0°C to 40°C)
Storage Temperature
-4°F to 158°F (-20°C to 70°C)
Operating Humidity
5% to 95% RH, non-condensing
Storage Humidity
0% to 95% RH, non-condensing
Supported IEEE Standards
802.11a/b/d/e/g/h/i/k/n/r/u/w/ac Wave 2, 802.1Q, 802.1AX, 802.1X, 802.3, 802.3u
Deployment Modes
Centralized, Cisco FlexConnect, Mesh (Bridge)
High Availability
Box-to-box 1:1 redundancy via Redundancy Port
Link Aggregation
LAG across all 5 ports
Licensing
AP capacity licenses sold separately (Cisco Smart Software Licensing supported from AireOS 8.5+)
Ideal Use Cases
Small to Medium Enterprise Campus WLAN
The 3504 controller centralizes RF management, security policy, and client roaming for up to 150 access points and 3,000 simultaneous users across a single campus or multi-building site.
Branch Office Wireless Consolidation
Cisco FlexConnect mode lets the AIR-CT3504-K9 manage branch APs over a WAN link with local data switching, keeping branch users connected even during WAN interruptions.
High-Density 802.11ac Wave 2 Rollout
The Multigigabit Ethernet uplink and 4 Gbps throughput ceiling ensure the controller keeps pace with Wave 2 MU-MIMO access points pushing multi-gigabit aggregate radio traffic.
Cisco DNA and SD-Access Wireless Environments
The 3504 is Cisco DNA-ready, supporting SD-Access Wireless and Cisco DNA Assurance for policy-based automation, intent-driven network analytics, and streaming telemetry.
Space-Constrained or Desktop Deployments
The compact 1RU chassis supports fanless quiet operation up to 30°C ambient, making it suitable for wiring closets, office server rooms, or desktop placement where rack space is limited.
Cost-Effective WLAN Infrastructure Refresh
Organizations replacing end-of-life controllers or expanding wireless capacity can deploy this refurbished unit at a significant discount while retaining full AireOS feature parity.
What's Included
Cisco AIR-CT3504-K9 3504 Wireless LAN Controller
Power Supply
Lifetime Warranty — No Time Limits. No Questions.
Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it. We have stood behind our hardware for 25 years and 5,000+ customers — that is not a marketing line, it is our operating standard.
Compatibility Details
Review supported optics, cables, software, management protocols, and environment-specific compatibility guidance.
SOFTWARE COMPATIBILITY
✓
Cisco Smart Software Licensing is supported from AireOS 8.5 onward.
ADDITIONAL COMPATIBILITY
✓
The Cisco AIR-CT3504-K9 is interoperable with the Cisco 5520 and 8540 Wireless Controllers within the Cisco Unified Wireless Network.
✓
It supports real-time communication with Cisco Aironet and Cisco Catalyst access points and integrates with Cisco Prime Infrastructure and the Cisco Mobility Services Engine.
✓
AP capacity licenses (sold separately) can be ported between the Cisco 3504, 5520, and 8540 controllers.
For compatibility verification specific to your environment, contact our engineering team: +1 214 607-4800 or sales@whaleycomm.com
Shipping & Returns
Clear fulfilment, tracking, return, warranty, and support information for enterprise hardware orders.
Shipping
Orders typically ship within 1-2 business days after payment confirmation. Tracking details are shared once the order has been dispatched.
Returns
Eligible products can be returned according to WhaleyComm's return policy. For DOA, warranty, or product-related issues, contact the support team for replacement or resolution.
Frequently Asked Questions
Product-specific answers about compatibility, testing, warranty, fulfilment, and purchase confidence.
The Cisco 3504 Wireless Controller supports up to 150 access points and up to 3,000 concurrent wireless clients with up to 4 Gbps of system throughput. AP capacity licenses are sold separately and are required to activate access point support beyond the base right-to-use entitlement.
Yes. The AIR-CT3504-K9 includes a dedicated Redundancy Port (RJ-45) for box-to-box 1:1 high-availability pairing. In this configuration, one controller operates in an active state while a second remains in hot standby, with configuration synced continuously between them for subsecond failover.
The 3504 supports IEEE 802.11a/b/g/n/ac Wave 2 and includes Cisco AVC with NBAR2 deep packet inspection, Cisco CleanAir RF optimization, TrustSec software-defined segmentation, embedded BYOD policy classification, FlexConnect for branch deployments, and Cisco DNA / SD-Access Wireless readiness running AireOS 8.5 and later.
Yes. Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it at no cost — no time limits, no questions asked.
Every unit goes through our ISO 9001-certified testing process: full power-on diagnostics, port-by-port functionality testing, firmware verification, factory reset, and final inspection. A Certificate of Testing ships with every unit.
Cisco AIR-CT3504-K9 Refurbished — 802.11ac Wave 2 Wireless LAN Controller
$475.00
Cisco
Cisco AIR-CT3504-K9 Refurbished — 802.11ac Wave 2 Wireless LAN Controller
MPN: AIR-CT3504-K9
$475.00
In Stock — Ships Same Day
