Cisco XR-NCS1K4-752K9= Multi-Terabit Line Car
Hardware Architecture and Interface Capabilities�...
The PSU-L-74W-ADPT= is a 74-watt AC/DC power adapter designed for Cisco’s small form-factor switches and IoT edge devices, including the Catalyst IE3400 Heavy Duty Series and CGR 1120 Rugged Router. Engineered for environments requiring reliable power delivery in harsh conditions, this adapter converts 100–240V AC input to 12V DC output with a 90% efficiency rating. Cisco emphasizes its compliance with MIL-STD-810G shock/vibration standards and IP67 ingress protection, making it ideal for industrial plants, transportation systems, and outdoor deployments.
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Electrical Performance:
Environmental Resilience:
Safety Certifications:
UL 60950-1, EN/IEC 62368-1, and CE Mark for EU/UK markets
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Case 1: Railway Signaling Systems
Case 2: Oil Refinery IoT Sensors
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Voltage Drop in Long-Distance DC Runs:
power inline consumption 60%
AC Surge Protection:
Connector Corrosion in Coastal Areas:
Source Cisco-validated PSU-L-74W-ADPT= units to ensure warranty compliance.
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Efficiency:
90% @ 50% load vs. 82% for Mean Well GST120A12 – saves 8.6kWh annually
Durability:
100,000+ power cycles vs. 30,000 for third-party units
Safety:
0 field failures in 5 years vs. 12% failure rate for non-Cisco adapters
TCO:
120vs.120 vs. 120vs.280 for Cisco’s PSU-L-150W-ADPT= – 57% savings for low-power needs
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Load Monitoring:
Use show env power
to track:
Power Supply 1:
Status: OK
Power: 48.6W
Voltage: 12.1V
Thresholds:
Preventive Maintenance:
Storage Guidelines:
While the PSU-L-74W-ADPT= excels in rugged low-power scenarios, its lack of PoE/PoE+ support limits utility in camera/Wi-Fi deployments. The fixed 12V output also complicates upgrades to higher-wattage devices like Catalyst 9200L switches. However, for industrial networks prioritizing longevity over flexibility—especially those with 10+ year device lifecycles—this adapter’s proven reliability justifies its niche role. As IoT edge compute evolves, designers must weigh the cost of standardized 802.3bt PoE against the simplicity of dedicated DC power in mission-critical OT environments.