Datasheet

Table Of Contents
1-15
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 1 Shelf and FMEC Hardware
1.10.1 Fan Speed
Figure 1-12 Position of the Fan-Tray Assembly
1.10.1 Fan Speed
If one or more fans fail on the fan-tray assembly, replace the entire assembly. You cannot replace
individual fans. The red Fan Fail LED on the front of the fan tray illuminates when one or more fans fail.
For fan tray replacement instructions, refer to the Cisco ONS 15454 SDH Troubleshooting Guide. The
red Fan Fail LED clears after you install a working fan-tray assembly.
Fan speed is controlled by TCC2/TCC2P card temperature sensors. The sensors measure the input air
temperature at the fan-tray assembly. Fan speed options are low, medium, and high. If the TCC2 card
fails, the fans automatically shift to high speed. The temperature measured by the TCC2 sensors is
displayed on the LCD screen.
1.10.2 Air Filter
The ONS 15454 SDH contains a reusable air filter that is installed beneath the fan-tray assembly.
The reusable filter is made of a gray, open-cell, polyurethane foam that is specially coated to provide fire
and fungi resistance. Spare filters should be kept in stock. Clean the filter every three to six months.
Replace the air filter every two to three years. Avoid cleaning the air filter with harsh cleaning agents or
solvents.
61236
FAN FAIL
CRIT
MAJ
MIN
Fan tray
assembly
LCD