Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guida All'Installazione

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The 15454-FTA2 fan-tray assembly is a removable drawer located at the bottom of the ONS 15454 front 
compartment that holds fans and fan-control circuitry. The front door of the ONS 15454 can be opened 
and left in place when removing or installing the fan-tray assembly. After you install the fan-tray 
assembly, you should only need to access it if a fan failure occurs or you need to replace or clean the 
fan-tray air filter installed beneath it. For more information on the fan-tray air filter, see the 

.

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. 
The red Fan Fail LED clears after you install a working fan tray. 

Fan speed is controlled by TCC/TCC+ 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 TCC/TCC+ 
card fails, the fans automatically shift to high speed. The temperature measured by the TCC/TCC+ 
sensors is displayed on the LCD screen on the fan-tray assembly.

When installing the 15454-FTA2 fan-tray assembly, ensure that you are familiar with the compatibility 
issues between the 15454-FTA2 and the 15454-SA-NEBS3E and 15454-SA-ANSI shelf assemblies as 
shown in 

. See 

 For a list of hardware incompatibility alarms.

The 15454-FTA2 fan-tray assembly can be installed in the 15454-SA-NEBS3E shelf assembly. The 
15454-FTA2 can also be installed in the ONS 15454 Release 3.1 shelf assembly 15454-SA-ANSI as 
long as no XC10G, OC192, or OC48 any slot (AS) cards are installed.