Overview Of Installing And Replacing Components; M120 Field-Replaceable Units (Frus) - Juniper M120 Hardware Manual

CHAPTER 23
Overview of Installing and Replacing
Components

M120 Field-Replaceable Units (FRUs)

Copyright © 2018, Juniper Networks, Inc.
M120 Field-Replaceable Units (FRUs) on page 179
Tools and Parts Required to Replace M120 Components on page 180
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.
Table 67 on page 180 lists the FRUs for the M120 router. If the router contains a redundant
host subsystem, the Control Board (CB) and the Routing Engine are hot-removable and
hot-insertable. Before you replace a CB or a Routing Engine, you must take the host
subsystem offline (see "Taking the M120 Host Subsystem Offline" on page 267).
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