The fan tray is a hot-insertable and hot-removable field-replaceable unit (FRU). The fan trays provide
front-to-back cooling, as shown in Figure 2. If one of the fans in a fan tray fails, you can remove the specific
fan tray and replace it with a spare fan tray module without powering off the router or disrupting normal
functions. Also, if one of the fans fails, the rest of the working fans will keep the system running indefinitely.
Figure 1: Fan Tray in a vEdge 5000 Router
The fan tray installs horizontally in the rear of the chassis. It has two thumbscrews that serve as handles and
also as a mechanism to secure the fan tray to the main chassis.
The air intake to cool the chassis flows through the perforations in the front of the chassis. Hot air exits from
the rear of the chassis via the vents provided near the fans. See Figure 2.
Figure 2: vEdge 5000 Router Airflow
Temperature sensors in the chassis monitor the internal chassis temperature. When a single fan/fan tray fails
at room temperature, the system can still provide sufficient cooling.
If a fan/fan tray fails or if the ambient temperature inside the chassis rises above the acceptable range, the
router raises an alarm. If the temperature inside the chassis rises above the maximum threshold temperature,
the router shuts down automatically.
Hardware Installation Guide for vEdge Routers
236
vEdge 5000 Router
Power Supply and Cooling in Cisco vEdge 5000 Routers
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