Power Supply Requirement Specifications
The following table provides a sample calculation of power for the switch AC power supply:
Table 5: Power Dissipation for AC Power Supply
Power at
220 V/50
Hz
(Watts)
Power at
110 V/60
Hz
(Watts)
Fan
Trays
Optics
Number
Optics
Speed
Voltage
Temperature
Traffic
Rate
PSU
Power
Mode
205
211
4
24
32G-SW
Nominal
25°C
50%
2
Typical
240
247
4
48
228
235
4
24
64G-SW
286
295
4
48
207
213
4
24
32G-SW
25°C
100%
2
Max
241
248
4
48
32G-SW
229
236
4
24
64G-SW
292
301
4
48
64G-SW
278
286
4
48
32G-SW
40°C
314
323
4
48
64G-SW
Table 6: Power Supply Fuse Information
Fuse Melting Time
I2t (Amps
2
seconds)
Fuse Rating (Amp)
Fuse Type
PID
4 min@15 A
2 min@30 A
534
15
Time-lag
DS-CAC-500W-I
30 [email protected] A
0.15 s@50 A
660
DS-CAC-500W-E
Component Power Requirements and Heat Dissipation
Consider heat dissipation when sizing the air-conditioning requirements for an installation. The power and
heat associated with switch varies based on the following considerations:
• The environment (temperature) outside the chassis
• Internal chassis temperature
• Any hardware component failure in the chassis
• Average switching traffic levels
Cisco MDS 9148V-K9 Switch Hardware Installation Guide
47
Technical Specifications
Power Supply Requirement Specifications