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What Is the ASR-9902-FILTER=?
The ASR-9902-FILTER= is a Cisco-engineered air filter module designed for the ASR 9902 Router chassis. It prevents dust, debris, and particulate matter from entering the system, ensuring uninterrupted airflow and protecting internal components like line cards and power supplies from contamination. This disposable filter is critical for deployments in non-climate-controlled environments or areas with high airborne particulates.
Technical Specifications and Design
- Material: Electrostatic polyurethane foam with 95% filtration efficiency for particles ≥5 microns.
- Compatibility: Exclusively fits ASR 9902 chassis airflow intakes (front/rear depending on configuration).
- Lifespan: 6–12 months under normal conditions; 3–6 months in high-dust environments.
- Safety Compliance: Meets NEBS GR-63-Core standards for fire resistance and toxic gas emissions.
ASR-9902-FILTER= vs. Third-Party Filters
| Factor | ASR-9902-FILTER= | Generic Air Filters |
|---|---|---|
| Filtration Efficiency | 95% at 5µm (Cisco-tested) | 70–85% at 5µm (unverified) |
| Airflow Restriction | Optimized for ASR 9902 CFM needs | May reduce airflow by 15–20% |
| Fire Safety | Self-extinguishing material | Often lack UL94 V-0 certification |
| Warranty Impact | Required for Cisco TAC support | Voids chassis warranty if used |
Critical Deployment Scenarios
1. Industrial and Outdoor Installations
Protects against metal dust in manufacturing plants or sand in desert telecom sites, which can short-circuit PCB traces.
2. Data Centers with Raised Floors
Filters cellulose fibers from underfloor airflow, preventing clogged heat sinks on ASR 9902 line cards.
3. Construction-Adjacent POPs
Blocks gypsum and concrete particles during building renovations near network hubs.
Maintenance Best Practices
- Replacement Schedule:
- Check monthly via chassis CLI (
show environment airflow). - Replace when airflow pressure drops 30% or every 6 months (whichever comes first).
- Check monthly via chassis CLI (
- Cleaning:
- Vacuum lightly between replacements if visible dust accumulates.
- Never wash with liquids—water degrades electrostatic properties.
- Disposal: Follow local e-waste regulations; polyurethane isn’t recyclable via standard programs.
Where to Purchase Genuine ASR-9902-FILTER= Kits
For performance guarantees and warranty compliance, the ASR-9902-FILTER= is available through itmall.sale, including bulk pricing for multi-unit data center deployments.
Lessons from Contamination-Related Failures
During a coastal carrier’s network outage, salt-laden air bypassed third-party filters, corroding ASR 9902 backplane connectors within months. Post-incident analysis showed Cisco’s OEM filter would have blocked 92% of salt particles. While filter costs seem trivial compared to downtime, their role in preserving multi-million-dollar routing infrastructure can’t be overstated. For mission-critical environments, cutting corners here is a gamble no network architect should take.