H3C Technologies H3C S7500E Series Switches - Manual (Page 112)

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(LSQM1GV48SC0) LPUs, and one fan tray, the minimum system power consumption of the switch
is 2 × 42 + 3 × 60 + 15.5 = 279.5 W.
• The maximum system power consumption is the total dynamic power consumption of all cards plus
the maximum fan tray power consumption. For example, for an S7503E switch that has two
LSQ1SRPB0 (LSQM1SRPB0) SRPUs, three LSQ1GV48SC0 (LSQM1GV48SC0) line processing
units (LPUs), and one fan tray, the maximum system power consumption of the switch is 2 × 50 + 3
× 90 +27.5 = 397.5 W.
PoE power consumption
The maximum PoE power consumption for the S7500E series depends on the type and number of PoE
cards, PoE power supply mode supported by each PoE card, and the number of ports that support PoE.
For example, if an S7503E switch has one LSQ1GV40PSC0 (LSQM1GV40PSC0), two LSQ1GV24PSC
(LSQM1GV24PSC0), and the SRPU does not support PoE, the maximum PoE power consumption of the
switch is 40 × 15.4 + 2 × 24 × 15.4 = 1355.2 W.
NOTE:
•
The PoE power consumption is 0 if the switch does not supply PoE power.
• The maximum PoE power consumption refers to the sum of the power consumption of all PDs when all
ports supporting PoE are connected to PDs, and the maximum output power is reached.
• For more information about PoE power supply, see “Installing modules.”
Heat dissipation
Heat dissipation is measured in BTU/h, and 1 W equals 3.4121BTU/h.
The heat dissipation of a switch depends on its power consumption. To calculate heat dissipation of the
switch, assume 90% power consumption is converted to heat, and the efficiency of the power module is
80%. Heat dissipation/hour of the switch is 0.9 × (total power consumption of the cards plus power
consumption of the fan tray)/0.8 × 3.4121.
For the power consumption of the cards and fan trays of the S7500E series switches, see "
Module power
consumption and total power consumption ."
Environmental specifications
Table 31 Environmental specifications
Description Operating Nonoperating
Temperature 0°C to 45°C (32°F to 113°F) –40°C to +70°C (–40°F to +158°F)
Relative humidity 10% to 95% (non-condensing) 5% to 95% (non-condensing)
Noise
The switch uses different types of fan trays. The S7503E-S uses fans with a fixed speed (the fan speed
does not change with the heat dissipation volume), so the sound pressure level of the switch is fixed. The
other models adopt fans with the automatic speed adjustment function, so the sound pressure levels are
different when the fan speeds are different. For more information, see Table 32 .