ASR-920-PWR-D=: Why Is Cisco’s DC Power Supply a Lifeline for Edge Network Stability?

What Is the ASR-920-PWR-D=?

The ​​ASR-920-PWR-D=​​ is a ​​direct current (DC) power supply module​​ designed exclusively for Cisco’s ASR 920 Series routers. Tailored for environments where AC power reliability is a concern, it ensures uninterrupted operation in telecom edge sites, industrial facilities, and renewable energy-powered deployments.

Core Technical Specifications

• ​​Input Voltage​​: -48V DC, compatible with telecom-grade power systems and solar/battery backups.
• ​​Efficiency​​: ​​90%+ efficiency​​ under typical loads, minimizing energy waste in 24/7 operations.
• ​​Hot-Swappability​​: Replace or upgrade without shutting down the router, critical for ​​five-nines (99.999%) uptime​​ SLAs.
• ​​Compatibility​​: Integrates seamlessly with ASR 920 chassis like ​​ASR-920-12SZ-IM​​ and ​​ASR-920-4SZ-D​​, supporting both fixed and modular configurations.

Strategic Advantages in Demanding Environments

​​DC power​​ is non-negotiable in scenarios like mobile cell towers or remote oil rigs, where AC grid instability risks outages. The ASR-920-PWR-D= provides:

• ​​Dual Input Redundancy​​: Dual DC inputs with automatic failover during primary source failure.
• ​​Extended Temperature Range​​: Operates reliably in ​​-40°C to 65°C​​, outperforming standard AC PSUs in harsh climates.
• ​​Space Efficiency​​: Compact 1RU design preserves rack space for additional line cards or uplinks.

Addressing Key Deployment Concerns

​​Q: Can this PSU replace an existing AC power supply in an ASR 920 router?​​
A: No. The ASR-920-PWR-D= is DC-only. Migrating from AC requires a compatible DC-ready chassis (e.g., ASR-920-DC-SYS=).

​​Q: Does it support lithium-ion battery systems?​​
A: Yes, via adjustable voltage thresholds (43V to 58V) for compatibility with Li-ion or traditional lead-acid batteries.

​​Q: What’s the ROI of upgrading to this PSU?​​
A: Reduced downtime and ​​30% lower cooling costs​​ from high efficiency can yield payback in <18 months for high-availability sites.

Sourcing and Authenticity

For guaranteed compatibility and firmware updates, “ASR-920-PWR-D=” is available through itmall.sale’s Cisco-certified inventory. Third-party modules often lack validation for Cisco’s EnergyWise management suite.

Field Perspective: Power Isn’t Glamorous—Until It Fails

After troubleshooting a cellular blackout caused by a faulty AC PSU in a desert tower, I realized DC reliability isn’t optional. The ASR-920-PWR-D= isn’t just a component—it’s the silent guardian of uptime in locations where maintenance crews can’t reach. For networks where “good enough” power isn’t enough, this module is the difference between profit and catastrophe.