Figure 1-13 Air Filter And One Fan Tray Pulled Out - Cisco ONS 15600 Series Reference Manual

1.10.2 Fan Speed and Failure
Figure 1-13
1.10.2 Fan Speed and Failure
If one or more fans fail on the fan-tray assembly, replace the fan tray where that fan resides. You cannot
replace individual fans. The red FAN LED on the front of the fan tray turns on when one or more fans
fail. For fan-tray replacement instructions, refer to the Cisco ONS 15600 Procedures Guide. The red
FAN LED clears after you install a working fan tray.
If both fans in the center fan tray are inoperative, you must replace the fan tray within five minutes of
Caution
failure to avoid affecting traffic because CTC software will shut down one of the single shelf
cross-connect (SSXC) cards.
The ONS 15600 requires at least one working fan in each of the three fan trays. When a single fan in a
Caution
tray fails, Cisco recommends replacing the tray with a fully working tray as soon as possible.
Note Each fan tray contains two fans. The FAN LED indicates if one or both fans fail in that fan tray.
Fan speed is determined by card temperature sensors that report temperature data to the active TSC card.
The sensors measure the input and output air temperature for each card. Fan speed options are low,
medium, and high. For example, if a card exceeds permissible operational temperature, the fan speed
Cisco ONS 15600 Reference Manual, R7.0
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Air Filter and One Fan Tray Pulled Out
Chapter 1 Shelf and Backplane Hardware