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SRX4120 Field-Replaceable Units

Learn about the field-replaceable units in the SRX4120.

Field-replaceable units (FRUs) are components that you can replace at your site. There are two types of FRUs:

Hot-insertable and hot-removable—You can remove and replace these components without powering off the device or disrupting the device functions.
Hot-pluggable—You can remove and replace these components without powering off the device, but the device function is interrupted until you replace the component.

Table 1: SRX4120 FRUs
FRU	Type
Power supply units	Hot-insertable and hot-removable
Fan modules	Hot-insertable and hot-removable
Transceivers	Hot-insertable and hot-removable

CAUTION:

Replace a failed PSU with a new PSU within five minutes of removal to maintain power redundancy when two PSUs are installed. The device continues to operate with only one PSU running.

If only one PSU is installed, there is no power redundancy.
Replace a failed fan module with a new fan module within five minutes of removal to prevent chassis overheating.