Field-Replaceable Units - Juniper MX204 Hardware Manual

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MX204 Field-Replaceable Units
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Copyright © 2018, Juniper Networks, Inc.
other configurations provide partial redundancy. The following major hardware
components are redundant:
Power supplies—The router supports two power supply modules. The MX204 router
provides 1+1 redundancy for the system. Both AC and DC systems can withstand the
failure of a single power supply without system interruption in 1+1 redundancy mode.
If one power supply fails in a fully redundant system, the other power supply can provide
full power to the router indefinitely.
Cooling system—The cooling system has a total of three fan modules, which are
controlled and monitored by the host subsystem. A fully configured router needs all
the fan modules to operate normal. The fan modules are at the rear and are used to
cool the router. If a fan fails or the temperature of the chassis rises above the
temperature threshold, the speed of the remaining fans is automatically adjusted to
keep the temperature within the acceptable range.
CAUTION: For a fully configured router, all the three fan modules and the
two power supply modules must be operational, and in the event of any
module failure the failed module must be replaced immediately.
MX204 Router Overview on page 3
Locating the Serial Number on an MX204 Router or Component on page 125
Guidelines for Packing Hardware Components for Shipment on page 122
Returning a Hardware Component to Juniper Networks, Inc. on page 123
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:
Power supply modules (if redundant)
Fan modules (if redundant)
Transceiver modules
MX204 Hardware Components and CLI Terminology on page 8
Replacing an MX204 AC Power Supply on page 97
Replacing an MX204 DC Power Supply on page 99
Replacing an MX204 Fan Module on page 95
Chapter 2: Chassis Components and Descriptions
7