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Preventing Power Loss
• 900 W DC power: - 40VDC to -72VDC
The DC power supply provides option to connect with two different sources (dual feed); positive (+) and
negative (-) are marked on the PSU terminals.
The power supply must be wired before plugging the power supply in the chassis. Ensure the branch circuit
Caution
breaker is turned off. Only after installing the power supply in the chassis, should the branch circuit breaker
be turned on. The branch circuit breaker must be turned off before unplugging the power supply.
Each power supply provides a dual primary input power connection.
Warning
Read the installation instructions before connecting the system to the power source. Statement 10
Do not use interface module and power supply ejector handles to lift the chassis; using the handles to lift
Caution
the chassis can deform or damage the handles.
Preventing Power Loss
Use the following guidelines to prevent power loss to the router.
• To prevent loss of input power, ensure that the total maximum load on each circuit supplying the power
• In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types
Use the information in the DC Power Supply Specifications table to estimate the power requirements and heat
dissipation of a Cisco NCS 4216 based on a given configuration of the router. Determining power requirements
is useful for planning the power distribution system needed to support the router.
Power Connection Guidelines
This section provides guidelines for connecting the Cisco NCS 4216 power supplies to the site power source.
Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground
Warning
conductor. Contact the appropriate cal inspection authority or an cian if you are uncertain that suitable
grounding is available. Statement 213
This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.
Warning
Install only in accordance with national and local wiring regulations. Statement 1045
Cisco NCS 4216 Hardware Installation Guide
32
supplies is within the current ratings of the wiring and breakers.
that use ferroresonant technology. These UPS types can become unstable with systems like the Cisco
NCS 4216, which can have substantial current draw fluctuations due to bursty data traffic patterns.
Installing the Cisco NCS 4216
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