Overview Of Installing And Replacing Components; T640 Field-Replaceable Units - Juniper T640 Hardware Manual

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Overview of Installing and Replacing

T640 Field-Replaceable Units on page 261

Tools and Parts Required to Replace the T640 Hardware Components on page 262

Field-replaceable units (FRUs) are router components that can be replaced at the

customer site. Replacing most FRUs requires minimal router downtime. The router uses

the following types of FRUs:

Hot-removable and hot-insertable FRUs—You can remove and replace these

components without powering off the router or disrupting the routing functions.

Hot-pluggable FRUs—You can remove and replace these components without powering

down the router, but the routing functions of the system are interrupted when the

component is removed.

Before you replace most host subsystem components, such as a

control board or Routing Engine, you must take the host subsystem offline.

However, it is not necessary to halt the host subsystem to insert or remove

You must power off the Routing Engine before replacing a CompactFlash

card or solid-state disk in a Routing Engine.

Table 89 on page 262

lists the FRUs for the router.

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