Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - E120 AND E320 HARDWARE GUIDE REV 9-29-2010 Hardware Manual page 30

E120 and E320 11.3.x Hardware Guide
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condition. The failure of any two components (fan or converter), or the absence of the
fan tray, causes the chassis to enter thermal protection mode to prevent hardware
damage. For information about troubleshooting high operating temperatures, see
"Troubleshooting" on page 77.
The E320 fan tray has two primary converters that power four fans each. If a primary
converter fails, a third redundant converter takes over. The E120 fan tray has dual
converters that load share for redundancy. If one converter fails, the other redundant
converter takes over. The system software reports an alarm if any of the fans or converters
fail.
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