Table 25: Fan and Acoustic Noise
Switch Model
Ambient
Temp
VIM
PoE
Main Fan
Speed (%
of max)
PSU1 +
PSU2
Bystander
Sound
Pressure
Declared
Sound
Power
(L
WAd
)
VSP4900-48P switch
25°C
VIM5-4XE 720W
20%
1100W (½
of max
PoE power
45.8
56.6
Note: Acoustic noise levels shown here represent noise emitted by the switch at room ambient temperatures.
Values are based on a fully configured system consisting of two PSUs and two I/O modules operating under full
load. Normal operating temperature range: 0°C to 50°C.
Fan Speed and Temperature Variation
The speed of the fan increases only when the temperature of the device increases. Fan speed is not
dependent on any fan failures.
Table 26: VSP 4900 Fan Speed and Power Consumption
Fan Speed
Fan Module RPM (typical)
Power
Inlet Fan
Outlet Fan
Typical
Full
16,000 (typ)
13,500 (typ)
15.8W per module*
Low
3,200 (typ)
2,800 (typ)
* Some units are equipped with (1) fan module, while others are equipped with 2. Total fan power is
equal to the number of installed fan modules multiplied by the fan power for each module.
Power Options
Table 27: VSP 4900 Power Supply Options
Switch Model
Power Supply
VSP4900-48P switch
1100 W AC power supply:
Part no. 10941 1100 W AC PS FB (front to back), Model PSSF112101A
100-127 V 200-240 V
50/60 Hz, 10.5A/5.0 A max per PS
2
Bystander Sound pressure is presented for comparison to other products measured using Bystander Sound Pressure.
3
Declared Sound Power is presented in accordance with ISO 7779:2010(E), ISO 9296:2010 per ETSI/EN 300
753:2012-01.
Technical Specifications
VSP 4900 Series Switches: Hardware Installation Guide
62
