M5 and M10 Router Redundant Cooling System Components
The M5 and M10 router cooling system consists of a fan tray containing four fans that inserts into the left side of the chassis (left fans 1 through 4). The fan tray connects to the router midplane and provides side-to-side cooling. (See Figure 1.)
The fan tray is hot-removable and hot-insertable. You can remove and replace these components without powering down the system and disrupting routing functions.
The cooling system is fault-tolerant. The router can tolerate the failure of a single fan for approximately 36 hours. If a fan fails, the router issues a yellow alarm and the yellow alarm LED on the craft interface lights. If the router temperature exceeds the critical level, the router automatically shuts down.
 | Caution: Do not operate the router for more than 1 minute without a fan tray. |
Figure 1: M5 and M10 Router Cooling System and Airflow
