Juniper SRX 5800, Hardware Manual

Page: 170 / 536

Configuring Ambient Temperature on SRX5800
Services Gateway
IN THIS SECTION
Understanding How Configuring Ambient Temperature Helps Optimize Power Utilization | 171
Monitoring the Power Consumption of SRX5800 Services Gateways Cards by Configuring the Ambient
Temperature | 172
Calculating Power Requirements to Support Eight SRX5K-SPC3s with Three IOC3s or Three IOC4s on an
SRX5800 Services Gateway | 173
Understanding How Configuring Ambient Temperature Helps Optimize
Power Utilization
The key to managing power in network infrastructure is the efficient utilization of provisioned power.
Provisioned power is the minimum power that is required to bring a device online. Junos OS determines
the minimum required power by considering the worst-case power requirement for all the FRUs installed
in the device. One of the methods to optimize the provisioned power on a device is to configure the device
to operate at a cooler temperature. You can enable a device to operate at a lower operating temperature
by configuring a lower ambient temperature.
Ambient temperature is the maximum operating temperature for a device. By configuring an ambient
temperature, you can optimize power provisioned for the line cards.
When a device restarts, the system adjusts the power allocation or the provisioned power for the line
cards on the basis of the configured ambient temperature. If enough power is not available, a minor chassis
alarm is raised. However, the chassis continues to run with the configured ambient temperature. You can
configure a new higher ambient temperature only after you make more power available by adding new
power supply modules or by taking a few line cards offline. By using the provisioned power that is saved
by configuring a lower ambient temperature, you can bring more hardware components online.
A specific ambient temperature value might not be applicable to a different geographical location, for
example, in a colder region. For devices operating in colder regions, you can configure a lower ambient
temperature, which helps reduce provisioned power significantly. However, in a region of higher
temperature, you might need to configure a higher ambient temperature to ensure smooth functioning of
the device. For example, if the device operates in a colder region, you can set the ambient temperature
to 25°C, which reduces the power consumption of line cards, thereby reducing the maximum power
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