Juniper M Series Monitoring And Troubleshooting Manual page 711

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control and monitoring functions for the router. These include determining Routing Engine

mastership; controlling power, reset, and SONET clocking for the other router components;

monitoring and controlling fan speed; and monitoring system status.

The Control Board is a component of the host module. Each Control Board requires a

Routing Engine to be installed in an adjacent slot. The Control Board in slot

above the Routing Engine in slot

the Routing Engine in slot

it does not function if there is no Routing Engine present in the adjacent slot.

If two Control Boards are installed, by default,

acts as a backup. If the master Control Board (

restarts and becomes the master Control Board.

The Control Boards install into the midplane from the back of the chassis (see

668) in M320 router , T320 router , T640 router , T1600 router, and TX Matrix

router. It is installed at the front in TX Matrix router (see

Control Boards are hot-pluggable.

Chapter 34: Monitoring Redundant Control Boards

, and the Control Board in slot

. Even if a Control Board is physically installed in the chassis,

acts as the master Control Board and

installs below

fails or is removed, the backup

Figure 335 on page