Juniper T640 - Overview of Installing and Replacing Components; T640 Field-Replaceable Units

CHAPTER 24
Overview of Installing and Replacing
Components
•
T640 Field-Replaceable Units on page 261
•
Tools and Parts Required to Replace the T640 Hardware Components on page 262
T640 Field-Replaceable Units
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.
NOTE: 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
a PC card.
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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