Table 39: Calculating Power Budget, AC-Powered Chassis
Unused PowerMaximum Output Power for System
Maximum Output Power of
Power Supply
2334 - 2282 = 52W1167 x 2 = 2334 W
(2+1 Redundancy)
1167 W (low-line)
4100 - 2282 = 1818 W2050 x 2 = 4100 W
(2+1 Redundancy)
2050 W (high-line)
Table 40: Calculating Power Budget, DC Powered Chassis
Unused PowerMaximum Output Power for System
Maximum Output Power of Power
Supply
2400 - 2282 = 118W2400W
(1+1 Redundancy)
2400 W (DIP=0)
2600 - 2282 = 318 W2600W
(1+1 Redundancy)
2600 W (DIP=1)
3. Calculate input power. In this step, the input power requirements for the example configuration are
calculated. To do this, divide the total output requirement by the efficiency of the power supply as
shown in Table 41 on page 159 Here we include the power drawn by the cooling system.
Table 41: Calculating System Input Power
Input Power Requirement
Power Supply Efficiency
1
Power Supply
2282/0.89 = 2564 W89 %SRX5400 AC
2282/0.98 = 2329 W~98 %SRX5400 DC
1
These values are at full load and nominal voltage.
4. Calculate thermal output (BTUs) for the system. To calculate this value, multiply the total input power
requirement (in watts) by 3.41 as shown in Table 42 on page 160.
159
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