Juniper SRX5600, Hardware Manual

Page: 168 / 483

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 37 on page 170 .Here we include the power drawn by the cooling system.
NOTE: Normal-capacity AC and DC power supplies are not included in the following
table, because their power budget was exceeded in the sample configuration.
Table 37: Calculating System Input Power for SRX5600 Services Gateway with SCB1 and RE1
Input Power Requirement
Power Supply
Efficiency
1
Power Supply
3880/0.85 = 4565 W 85 % SRX5600 AC standard-capacity
3880/0.89 = 4360 W 89 % SRX5600 AC high-capacity
3880/0.98 = 3960 W ~98 % SRX5600 DC standard-capacity
3880/0.98 = 3960 W ~98 % SRX5600 DC high-capacity
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 38 on page 170 .
Table 38: Calculating System Thermal Output for SRX5600 Services Gateway with SCB1 and RE1
Thermal Output (BTUs per hour) Power Supply
4565 * 3.41 = 15,566 BTU/hr SRX5600 AC standard-capacity
4360 * 3.41 = 14,867 BTU/hr SRX5600 AC high-capacity
3960 * 3.41 = 13,503 BTU/hr SRX5600 DC standard-capacity
3960 * 3.41 = 13,503 BTU/hr SRX5600 DC high-capacity
170