NC57-2RU-ACC-KIT3= Rack-Mount Accessory Kit:
Hardware Components & Technical Specifications The ...
What Is the ASR-9901-FAN=?
The ASR-9901-FAN= is a Cisco-designed fan tray module exclusively for the ASR 9901 Router chassis. It provides active cooling and thermal management for the router’s critical components, including line cards, route processors, and power supplies. Engineered to match the ASR 9901’s airflow requirements, it ensures stable operation even under maximum load conditions of 800G per slot.
Technical Specifications and Operational Design
- Airflow Capacity: 300 CFM (cubic feet per minute) with variable-speed control based on real-time temperature sensors.
- Redundancy: Supports N+1 configuration; a single failed fan won’t trigger system shutdown.
- Noise Levels: 65 dBA at full speed, optimized for data center environments.
- Compatibility: Works only with ASR 9901 chassis; not interchangeable with ASR 9904/9906/9910 models.
- Hot-Swappable: Replace fans without powering down the chassis, minimizing service disruptions.
ASR-9901-FAN= vs. Third-Party Alternatives
| Feature | ASR-9901-FAN= | Generic Fan Trays |
|---|---|---|
| Airflow Precision | Matches ASR 9901’s front-to-back design | May disrupt airflow, causing hotspots |
| Firmware Integration | Syncs with Cisco IOS XR for speed optimization | No integration with Cisco software |
| Warranty Compliance | Mandatory for Cisco TAC support | Voids chassis warranty |
| Longevity | 70,000-hour MTBF (Cisco-tested) | Typically 30,000–40,000 hours MTBF |
Critical Deployment Scenarios and Maintenance Best Practices
1. High-Density Data Centers
In 400G/800G deployments, the module’s variable-speed fans adapt to fluctuating loads, preventing thermal throttling during traffic spikes.
2. Edge POPs (Points of Presence)
Operates reliably in non-climate-controlled environments (0°C to 40°C) with dust filters for harsh conditions.
3. Proactive Maintenance
- Cleaning: Replace air filters every 6 months in high-particulate environments.
- Testing: Use Cisco CLI commands like
show environment fanto monitor health. - Replacement: Schedule fan swaps after 5 years or upon firmware-recommended alerts.
Where to Purchase Genuine ASR-9901-FAN= Modules
For warranty adherence and performance guarantees, the ASR-9901-FAN= is available exclusively through itmall.sale, including bulk procurement options for large-scale upgrades.
Lessons from the Field
During a hyperscaler’s core network outage investigation, third-party fans were found to run 20% slower than required, causing route processors to overheat. After replacing them with ASR-9901-FAN= modules, temperatures normalized, and packet loss ceased. While cheaper alternatives might seem appealing, the risks of unplanned downtime and voided support contracts make this module indispensable for ASR 9901 reliability. Cisco’s thermal engineering isn’t just about cooling—it’s about ensuring every component performs at its engineered peak.