S e 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 c k - d o c @ c i s c o . c o m
B-5
Cisco MDS 9100 Series Hardware Installation Guide
OL-21514-01
Appendix B Technical Specifications
Power Specifications
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.
Table B-6
provides a sample calculation of power and heat dissipation for the Cisco MDS 9100 Series
AC input power supply.
Connection Guidelines for AC-Powered Systems
For connecting the Cisco MDS 9100 Series switch AC power supplies to the site power source, follow
these basic guidelines:
•
Each power supply should have its own dedicated branch circuit.
Cisco MDS 9140
Switch (with fan
modules)
204 maximum 870
3.0
2.32
1.16
Cisco MDS 9120
Switch (with fan
modules)
180 maximum 752
2.65
2.05
1.02
Table B-5
Power and Heat Dissipation for AC Input Power Supply (continued)
Model Number/Module
AC Input
Power (watts)
Heat Diss.
(BTU/hr)
Input Current
85 VAC
(amps)
110 VAC
(amps)
220 VAC
(amps)
Table B-6
Power and Heat Dissipation for DC Input Power Supply
Model Number/
DC Input
Power (watts)
Heat Diss.
(BTU/hr)
Input Current
48 VDC
(amps)
60 VDC
(amps)
Cisco MDS 9148
Switch (with fan
modules)
Not supported
-
-
-
Cisco MDS 9134
Switch (with fan
modules)
96 maximum
332
8.00
6.67
Cisco MDS 9124
Switch (with fan
modules)
80 maximum
273
8.00
6.67
Cisco MDS 9140
Switch (with fan
modules)
204 maximum 928
5.67
4.53
Cisco MDS 9120
Switch (with fan
modules)
180 maximum 819
5.00
4.00