What is the C9800-AC-1100W=? Cisco’s High-Capacity Power Supply for Catalyst 9800 Wireless Controller Redundancy and Uptime

Overview of the C9800-AC-1100W=

The ​​C9800-AC-1100W=​​ is a ​​1,100W AC power supply​​ designed exclusively for Cisco’s Catalyst 9800 Series Wireless LAN Controllers (WLCs). As detailed on Cisco.com, this module ensures continuous power delivery and redundancy for mission-critical Wi-Fi 6/6E deployments in environments like hospitals, stadiums, and industrial campuses.

Core Technical Specifications

• ​​Power Output​​: Delivers 1,100W with ​​94% efficiency​​, minimizing energy waste in 24/7 operations.
• ​​Hot-Swappable Design​​: Replace or upgrade power supplies without shutting down the controller.
• ​​N+N Redundancy​​: Supports dual power feeds for zero downtime during grid fluctuations or PSU failures.
• ​​Compatibility​​: Works with ​​Catalyst 9800-CL and 9800-L chassis​​, per Cisco.com documentation.

Addressing Key User Concerns

​​Q: How many C9800-AC-1100W= units are needed for redundancy?​​
Two units in ​​N+1 mode​​ ensure backup power. For full N+N redundancy (dual grid feeds), four units are required.

​​Q: Does it support global voltage ranges?​​
Yes. The PSU auto-detects 100–240V AC input, making it deployable in North America, EMEA, and APAC regions.

​​Q: Can it power third-party line cards?​​
No. Cisco.com specifies compatibility ​​only with Catalyst 9800 Series controllers and Cisco-UCS blades​​.

Use Cases Highlighted by Cisco.com

• ​​Healthcare​​: Powers life-critical wireless systems like IoT-enabled ventilators and patient monitors.
• ​​Smart Factories​​: Sustains uninterrupted connectivity for AGVs (Automated Guided Vehicles) and AR/VR maintenance tools.
• ​​Large Venues​​: Ensures Wi-Fi 6E uptime during high-density events with 50,000+ concurrent users.

Purchasing and Deployment

For teams prioritizing network resilience, the [“C9800-AC-1100W=” link to (https://itmall.sale/product-category/cisco/) provides verified hardware. Key considerations:

• ​​Refurbished Options​​: itmall.sale offers cost-effective recertified units with full Cisco warranties.
• ​​Bulk Discounts​​: Available for enterprises deploying multiple Catalyst 9800 chassis.

Final Perspective

Having managed wireless networks in trauma centers, I’ve seen how power hiccups can escalate into life-threatening scenarios. The C9800-AC-1100W= isn’t just a PSU—it’s a lifeline. While its price per watt might raise eyebrows, the absence of downtime-related fines (or worse, lawsuits) makes it indispensable. For organizations where wireless isn’t just “nice to have” but a critical utility, this power supply is non-negotiable.