Details the chassis ventilation mechanisms for Cisco 8400 Series Secure Routers to ensure effective cooling and reliable device operation.
The chassis temperature is regulated with internal fans. An onboard temperature sensor and pressure sensor controls the fan speed. The fans are always on when the device is powered on. Under all conditions, the fans operate at the slowest speed possible to conserve power and reduce noise. The fans operate at higher speeds under conditions of higher ambient temperature and altitude or under fault conditions like a fan failure. The air intake is on the I/O side.
