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Chapter 13
Replacing Hardware Components
This chapter explains how to replace hardware components on the router. It discusses
the following topics:
■ Field-Replaceable Units (FRUs) on page 87
■ Tools and Parts Required on page 88
■ Replacing the Craft Interface on page 89
■ Replacing Cooling System Components on page 92
■ Replacing Host Subsystem Components on page 96
■ Replacing a Routing Engine on page 102
■ Replacing Connections to Routing Engine Interface Ports on page 104
■ Replacing DPCs and Transceivers on page 106
■ Replacing Power System Components on page 112
■ Replacing the Cable Management System on page 121
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 off the router, but the routing functions of the system are interrupted
when the component is removed.
Table 23 on page 88 lists the FRUs for the MX240 router. Before you replace an SCB
or a Routing Engine, you must take the host subsystem offline (see “Taking the Host
Subsystem Offline” on page 96).
Field-Replaceable Units (FRUs) ■ 87