B-3
Cisco MDS 9100 Series Hardware Installation Guide
OL-16187-01
AppendixB Technical Specifications
Power Specifications
General Power Supply Specifications
Table B -3 lists the specifications for the Cisco MDS 9100 Series AC input power supply.
Power Supply Requirements and Heat Dissipation Specifications
Table B -4 provides a sample calculation of power and heat dissipation for the Cisco MDS 9100 Series.
Tip To prevent a loss of input power, ensure the total maximum load on each circuit supplying the power
supply is within the current ratings of the wiring and breakers.
TableB-3 CiscoMDS 9100 Series AC Input Power Supply Specifications
AC-Input Power Supply Specification
AC-input voltage Minimum = 85 VAC
Nominal = 100 to 240 VAC
Maximum = 264 VAC
AC-input current rating
(maximum)
4.7 A at 85 VAC
3.6 A at 110 VAC
1.8 A at 220 VAC
Note For plug current rating, see the
“Jumper Power Cord” section on
page C-5.
AC-input frequency Minimum = 47 Hz
Nominal = 50 to 60 Hz
Maximum = 63 Hz
Power supply output capacity 300 W
Power supply output voltage 12 V +/- 6% up to 25 A
Output holdup time 20 ms when input > 100 VAC
TableB-4 Power and Heat Dissipation
Model Number/
AC-Input
Power (watts)
Heat Diss.
(BTU/hr)
Input Current
85 VAC
(amps)
110 VAC
(amps)
220 VAC
(amps)
Cisco MDS 9134 Switch
(with fan modules)
96 maximum 330 1.41 1.10 .55
Cisco MDS 9124 Switch
(with fan modules)
96 maximum 330 1.41 1.10 .55
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