Juniper EX9251, Руководство по оборудованию, Страница: 41 / 217

Table 13: Power Requirements for an AC-Powered Switch at Typical Temperature (25°C)
Chassis Configuration Power Requirement at 25°C
(Watts) Power Requirement (Watts)
with 90% Efficiency
Fully configured chassis running at high activity 240 W 266 W
Table 14 on page 32 lists the power requirements for a fully configured AC-powered switch operating
under maximum voltage conditions.
Table 14: Power Requirements for an AC-Powered Switch at Maximum Temperature (55°C)
Chassis Configuration Power Requirement at 55°C
(Watts) Power Requirement (Watts)
with 90% Efficiency
Fully configured chassis running at high activity 280 W 311 W
Calculating System Thermal Output
After you have calculated the power consumption for your configuration, you can use that information
to determine the system thermal output (BTUs per hour). To do so, multiply the power consumption in
watts by 3.41.
For example, in Table 13 on page 32 , we calculated the power consumption for a fully configured chassis
running at high activity at 25°C typical temperature to be 240 W. Using that information, we can
calculate the system thermal output for the configuration:
Power consumption in watts * 3.41 = system thermal output in BTU/hr
240 W * 3.41 = 818.4 BTU/hr
Power Supply Specifications for EX9251 Switches
Table 15 on page 33 lists the AC power system electrical specifications.
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