Mx2020 Field-Replaceable Units - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
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MX2020 Field-Replaceable Units

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SFBs, and one CB-RE, (see
of the fans fails, the host subsystem increases the speed of the remaining fans to
provide sufficient, cooling for the router. The fan trays are powered by two power
subsystems that are divided into zones (upper zone 1 and lower zone 0).
MX2020 Router Overview on page 3
Displaying MX2020 Router Components and Serial Numbers
Guidelines for Packing Router Components for Shipment on page 409
Returning a Hardware Component to Juniper Networks, Inc. on page 412
Field-replaceable units (FRUs) are router components that can be replaced at the
customer site (see Table 7 on page
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.
NOTE: Before you replace most host subsystem components, such as the
Control Board and Routing Engine (CB-RE), you must take the host
subsystem offline.
Table 7 on page 17 lists the FRUs for the MX2020 router.
"MX2020 Cooling System Description" on page
17). Replacing most FRUs requires minimal router
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53). If one