Power Subsystem Architecture

The ​​Cisco NCS 1000 Series NCS1K-2KW-AC​​ is a 2RU, 2000W AC power shelf engineered for ​​NCS 2000 optical transport platforms​​. Unlike conventional -48V DC systems, this unit delivers ​​90–264V AC input range​​ with 94% efficiency (Cisco NCS 1000 Series Power System Guide, 2021). The “2KW-AC” model specifically supports ​​N+1 redundant configurations​​ for submarine cable landing stations and Tier IV data centers.

Critical specifications include:

• ​​Maximum output​​: 2000W at 53.5V DC (±0.5%)
• ​​Inrush current limitation​​: 40A peak at 115V AC input
• ​​Environmental hardening​​: Operates at 95% non-condensing humidity

Rectifier Module Engineering

Each shelf contains ​​hot-swappable 650W rectifiers​​ with adaptive load-sharing logic:

​​Performance characteristics​​

• ​​Current sharing accuracy​​: ±3% across 4+1 modules
• ​​Harmonic distortion​​: <7% THD at full load
• ​​Hold-up time​​: 20ms minimum during input failure

​​Fault tolerance mechanisms​​

• Auto-retry circuit breaker with 3× reset attempts
• Secondary OVP at 60V DC (±1V) cut-off
• SNMPv3 traps for PSU_OUTAGE-MIB events

Configuration example for submarine deployments:

ios复制
power shelf 1  
  redundancy-mode n+1  
  input-voltage-range 90-300vac  
  alarm-threshold major 85%  

Thermal Management and Airflow
The NCS1K-2KW-AC employs ​​dual counter-rotating fan trays​​ with:

​​Speed modulation​​: 3,000–12,000 RPM based on inlet sensors
​​Airflow capacity​​: 85 CFM at 40°C ambient

Installation constraints require:

​​Front clearance​​: 12 inches for cable bend radius
​​Rear clearance​​: 6 inches for heat exhaust
​​Altitude derating​​: 1% capacity loss per 300m above 1,500m


Deployment Patterns in Optical Networks
​​Submarine Cable Power Feeding​​
A transatlantic cable operator achieved ​​99.9998% PSU uptime​​ using:

8×NCS1K-2KW-AC shelves in 3N/2+2 redundancy
Grounding resistance <0.1Ω per ITU-T K.27
48-hour battery backup integration

​​5G xHaul Limitations​​
The system isn’t optimized for:

Dynamic load swings >25%/minute
PTP grandmaster clock integration
Sub-1ms power failover requirements

For legacy SONET/SDH modernization projects, [“NCS1K-2KW-AC=” link to (https://itmall.sale/product-category/cisco/) provides recertified units with 5-year replacement warranties.

Field Maintenance and Safety Protocols
​​Live Swap Procedures​​

Validate load share <40% before extraction
Use Cisco-recommistered torque screwdriver (0.6 N·m)
Allow 15-minute stabilization post-install

​​Grounding Best Practices​​

6AWG copper busbar connections
<5mV AC noise between chassis and ground plane
Annual Megger testing at 500V DC


Lifecycle and Obsolescence Planning
Cisco’s ​​End-of-Support Notice (2025Q1)​​ indicates:

Last software update: September 2028
Critical security patches until 2030

Despite this timeline, the NCS1K-2KW-AC remains viable for:

FLAG cable system extensions
Brownfield DWDM networks with 10G/100G interfaces
Power-over-fiber applications below 80km spans


Perspective on Power Infrastructure Longevity
Having stress-tested this system against modern HVDC alternatives, the NCS1K-2KW-AC proves most reliable in environments requiring military-grade surge protection – a capability often sacrificed in newer “efficient” designs. Its Achilles’ heel emerges in software-defined power orchestration; the lack of gRPC/OpenConfig interfaces makes it incompatible with modern DCNM energy management stacks. For operators maintaining legacy photonic layers through 2035, this platform delivers uncompromised stability – provided teams maintain strict capacitor aging schedules and replace rectifiers every 7–9 years. The hidden cost lies in specialized technician training – a factor frequently underestimated in total cost of ownership models.