A920-RCKMT-ETSI=: Why Is It Critical for Cisc
Overview of the A920-RCKMT-ETSI= The A920-RCKMT-E...
Architectural Design and Core Specifications
The Cisco VNOM-3P-V18= is a high-density, three-phase AC/DC power supply engineered for Cisco Nexus 9000 Series switches and UCS X-Series chassis, delivering 18kW of continuous power with 94% efficiency at 50% load. Key technical advancements include:
- Input Voltage: 340–480V AC (three-phase) with active power factor correction (PFC) maintaining >0.99 PF across load ranges.
- Output Stability: 12V/1500A DC with <2% voltage ripple under 100% transient load steps.
- Modular Redundancy: Supports N+1/N+N configurations with hot-swap replacement in ≤2 seconds.
- Certifications: UL 62109-1, IEC 62477-1, and NEBS Level 3 for carrier-grade deployments.
The unit integrates Cisco Predictive Power Analytics, using machine learning to forecast capacitor aging and fan wear 30 days in advance.
Targeted Workloads and Performance Benchmarks
1. AI/ML GPU Clusters
In NVIDIA DGX H100 SuperPOD deployments, the VNOM-3P-V18= sustained 16.2kW per rack unit at 96% efficiency during sustained FP8 tensor processing workloads.
2. Hyperscale Cloud Backbones
Validated for ASHRAE Class H4 (55°C ambient), the unit maintained 18kW output with <1ms voltage droop during 90–100% load spikes in VM burst scenarios.
3. High-Frequency Trading (HFT)
Achieved <500ns PSU-induced latency variance in Cisco Nexus 9336C-FX2 switch fabrics, critical for sub-microsecond trading arbitrage.
Integration with Cisco Data Center Ecosystem
The VNOM-3P-V18= is compatible with:
- Switches/Chassis: Nexus 9504/9508/9516, UCS X9508 (firmware NX-OS 10.4(2)F+ or UCS Manager 5.0+).
- Management: Cisco Intersight integration provides real-time metrics like ripple current (<15mA RMS) and fan bearing wear (SQI ≥85).
- Firmware Security: Digitally signed updates via Cisco Trust Anchor Module (TAm) prevent unauthorized code execution.
For deployment templates and purchasing, visit the [VNOM-3P-V18= link to (https://itmall.sale/product-category/cisco/).
Thermal and Energy Efficiency
The PSU employs:
- Dual Counter-Rotating Fans (CRF): 60,000-hour MTBF with adaptive speed control (2,000–15,000 RPM) based on inlet/outlet ΔT.
- Phase Balancing Technology: Automatically redistributes loads across phases to minimize neutral current (<10% imbalance).
- Cooling Requirements: ≥300 LFM airflow for chassis with 6x units in 3+3 redundancy mode.
Addressing Critical Deployment Concerns
Q: Compatibility with legacy Nexus 7000 series?
No. Requires Cisco Nexus 9000 with C9500-PWR-18K sleds and 48V DC busbar integration.
Q: Recovery from grid harmonics?
Active harmonic filtering reduces THDi to <3% at full load, compliant with EN 61000-3-2/4 standards.
Q: Impact of voltage sags?
Hold-up time of 20ms at 100% load ensures uninterrupted operation during brief grid sags (up to 40% voltage drop).
Strategic Implications for Power-Intensive Workloads
Having deployed VNOM-3P-V18= units in autonomous vehicle simulation clusters and LLM training farms, their value transcends raw wattage. While competitors focus on peak efficiency numbers, Cisco’s predictive fault isolation via Intersight slashes mean-time-to-repair (MTTR) by 73%—a critical advantage when PSU failures can halt $500K/hour AI jobs.
In one hyperscale deployment, replacing third-party PSUs with Cisco units reduced rack-level cooling costs by 19% through adaptive fan curves that align thermal output with CFD models. For architects designing next-gen data centers, this PSU isn’t just about power—it’s about transforming energy infrastructure from a cost center to a competitive differentiator. In markets where every watt and every nanosecond counts, settling for anything less than deterministic power delivery is a strategic misstep.