CHAPTER 14
Replacing M120 Hardware Components
•
M120 Field-Replaceable Units (FRUs) on page 127
•
Tools and Parts Required to Replace M120 Components on page 128
•
Replacing the M120 Craft Interface on page 129
•
Replacing Connections to M120 Routing Engine Interface Ports on page 132
•
Replacing M120 Cooling System Components on page 134
•
Replacing M120 Host Subsystem Components on page 140
•
Replacing Packet Forwarding Engine Components on page 149
•
Replacing M120 Power System Components on page 173
M120 Field-Replaceable Units (FRUs)
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 21 on page 128 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 140).
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