Juniper Networks M10i manual Fan Tray, Cable Management System

Chapter 2: Hardware Component Overview

Fan Tray

The router's cooling system consists of two fan trays, located along the left and right side of the chassis, that provide side-to-side cooling (see Figure 9). They connect directly to the router midplane. Each fan tray is a single unit containing eight individually fault-tolerant fans. If a single fan fails, the remaining fans continue to function indefinitely. For proper airflow, the primary fan tray should be installed in slot 1 (the left slot looking at the chassis from the rear) and must be installed for proper cooling at all times. The redundant fan tray, if present, should be installed in slot 0 on the right. This fan tray provides additional cooling and redundancy.

Figure 9: Airflow Through the Chassis

The fan tray is hot-removable and hot-insertable, as described in “Field-Replaceable Units (FRUs)” on page 3. For instructions on replacing it, see “Replacing a Fan Tray” on page 88.

CAUTION: Do not remove both fan trays for more than one minute while the router is operating. The fans are the sole source of cooling, and the router can overheat when they are absent.

Cable Management System

The cable management system consists of racks that attach vertically to each side of the chassis at the front, as shown in Figure 10. Pass PIC cables through the slots in the racks to keep the cables organized and securely in place, and to avoid bending optical cables beyond the proper bend radius. The cable management system evenly distributes the weight of a cable, so that it is not subjected to undue stress at the connector.

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