- play_arrow Site Planning, Preparation, and Specifications
- play_arrow Initial Installation and Configuration
- play_arrow Maintaining Components
- play_arrow Troubleshooting Hardware
- play_arrow Contacting Customer Support and Returning the Chassis or Components
- play_arrow Safety and Compliance Information
- General Safety Guidelines and Warnings
- Definitions of Safety Warning Levels
- Qualified Personnel Warning
- Warning Statement for Norway and Sweden
- Fire Safety Requirements
- Installation Instructions Warning
- Chassis and Component Lifting Guidelines
- Ramp Warning
- Rack-Mounting and Cabinet-Mounting Warnings
- Grounded Equipment Warning
- Radiation from Open Port Apertures Warning
- Laser and LED Safety Guidelines and Warnings
- Maintenance and Operational Safety Guidelines and Warnings
- General Electrical Safety Guidelines and Warnings
- Action to Take After an Electrical Accident
- Prevention of Electrostatic Discharge Damage
- AC Power Electrical Safety Guidelines
- AC Power Disconnection Warning
- DC Power Electrical Safety Guidelines
- DC Power Disconnection Warning
- DC Power Grounding Requirements and Warning
- DC Power Wiring Sequence Warning
- DC Power Wiring Terminations Warning
- Multiple Power Supplies Disconnection Warning
- TN Power Warning
- Agency Approvals for EX Series Switches
- Compliance Statements for EMC Requirements for EX Series Switches
- Compliance Statements for Acoustic Noise for EX Series Switches
- Statements of Volatility for Juniper Network Devices
- play_arrow Downloads
XRE200 Cooling System
The cooling system in an XRE200 External Routing Engine consists of two fan modules, left and right side air intake, and exhaust openings in the power supplies. The fan modules are located in the fan module slots on the back of the XRE200 External Routing Engine.
XRE200 External Routing Engines are shipped with fan modules installed in both fan module slots on the rear panel of the chassis (see Figure 1).
We recommend that you install both fan modules in an XRE200 External Routing Engine whenever possible. An XRE200 External Routing Engine can operate for a period of time with a single fan module; however, the chassis might shut down when the high temperature threshold is exceeded if a fan module is not available to properly cool the external Routing Engine.
Fan modules are hot-removable and hot-insertable field-replaceable units (FRUs).
Figure 2 shows the airflow in the XRE200 External Routing Engine.
Temperature sensors in the chassis monitor the temperature within the chassis. If the ambient temperature rises above the threshold 30°C, the speed of the working fans is automatically adjusted to keep the temperature within the acceptable range, 5°C through 40°C. The system raises an alarm if the fan fails or if the temperature inside the chassis rises above permitted temperature thresholds. The alarm temperature thresholds can be seen by entering the show chassis temperature-thresholds command.
If the ambient temperature inside the chassis rises above 75°C, the system shuts down automatically.
You can use the hardware chassis LEDs to monitor environmental status. See Chassis LEDs on an XRE200 External Routing Engine.
