Do not use interface-module and power-supply ejector handles to lift the chassis; using the handles to lift
the chassis can deform or damage the handles.
Caution
These sections describe the Cisco ASR 903 Router satellite shelf power supplies:
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
supplies is within the current ratings of the wiring and breakers.
•
In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types
that use ferroresonant technology. These UPS types can become unstable with systems like the Cisco
ASR 903 Router as a satellite shelf, which can have substantial current draw fluctuations due to bursty
data traffic patterns.
Use the information in the Cisco ASR 9000v Satellite Shelf with a DC Power Module section to estimate the
power requirements and heat dissipation of a Cisco ASR 903 Router as a satellite shelf 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 ASR 903 Router satellite shelf power supplies to
the site power source.
This equipment is intended to be grounded to comply with emission and immunity requirements. Ensure
that the switch functional ground lug is connected to earth ground during normal use. Statement 1064
Warning
The plug-socket combination must be accessible at all times because it serves as the main disconnecting
device. Statement 1019
Warning
This product requires short-circuit (overcurrent) protection, to be provided as part of the building installation.
Install only in accordance with national and local wiring regulations. Statement 1045
Warning
Guidelines for DC-Powered Systems
Basic guidelines for DC-powered systems include the following:
•
Each chassis power supply should have its own dedicated input power source. The source must comply
with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and
IEC 60950 standards.
Cisco ASR 9000 Series Aggregation Services Router Satellite Systems Installation Guide
40
Installing the Cisco ASR 903 Router as a Satellite Shelf
Preventing Power Loss
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