Site Preparation
Se n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a ck - d o c @ c i s c o . c o m
Power Considerations
AC and DC power supplies, and an optional redundant (second) power supply, are available for most systems. Be careful when connecting systems to the supply circuit so that wiring is not overloaded.
Note Refer to your hardware installation guide for AC and DC power specifications and for redundant power supply availability.
Ensure that circuits are sized according to local and national codes and that the site power meets the power requirements as specified in the hardware installation guide. If available, you can use an uninterruptible power supply (UPS) to protect against power failures.
Caution Avoid UPS types that use ferroresonant technology. These UPS types can become unstable with systems like the Cisco MDS 9000 Family, which can have substantial current draw fluctuations because of fluctuating data traffic patterns.
Caution To prevent loss of input power, ensure the total maximum loads on the circuits supplying power to the switch are within the current ratings for the wiring and breakers.
AC Power
The system is designed for connection to TN power systems. A TN power system is a power distribution system with one point connected directly to earth (ground). The exposed conductive parts of the installation are connected to that point by protective earth conductors.
Ensure that the
DC Power
Follow these guidelines for DC power supplies:
•Connect
•Ensure that there is a readily accessible disconnect device incorporated in the building's installation wiring.
•Ensure that power is removed from the DC circuit before installing or removing power supplies. Tape the switch handle of the DC circuit breaker in the off position.
•Use only copper conductors to connect to a DC terminal block.
•Use approved wiring terminations, such as
•Ensure that no exposed portion of the
Regulatory Compliance and Safety Information for the Cisco MDS 9000 Family
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