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Cisco MDS 9148S Multilayer Switch Hardware Installation Guide
OL-20185-01
Chapter 1 Technical Specifications
Power Specifications
Power Supply Requirements Specifications
provides a sample calculation of power for the Cisco MDS 9148S switch AC input power
supply.
Tip
To prevent a loss of input power, ensure that the total maximum load on each circuit supplying the power
supply is within the current ratings of the wiring and breakers.
Connection Guidelines for AC-Powered Systems
For connecting the Cisco MDS 9148S switch AC power supplies to the site power source, follow these
basic guidelines:
•
Each power supply should have its own dedicated branch circuit.
•
For international, circuits should be sized according to local and national codes.
•
The AC power receptacles used to plug in the chassis must be the grounding type. The grounding
conductors that connect to the receptacles should connect to protective earth ground at the service
equipment.
Power supply output capacity
300 W
Power supply output voltage
12 V +/- 6% up to 25 A
Output holdup time
20ms when input > 100 VAC
Table 1-3
Cisco MDS 9148S Switch AC Input Power Supply Specifications
AC Input Power Supply
Specification
Table 1-4
Power and Heat Dissipation for AC Input Power Supply
Cisco MDS 9148S Switch
AC Power (Volt)
AC Power (Watt)
220
125.08
Typical Case
220
125.08
110
127.72
50C/NV
220
144.8
110
145.87
50C/HV
220
155.3
110
158.48
Worst Case
220
183.11
110
187.66
