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

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The 15454-FTA3-T 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+/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 
TCC+/TCC2/TCC2P card fails, the fans automatically shift to high speed. The temperature measured by 
the TCC+/TCC2/TCC2P sensors is displayed on the LCD screen on the fan-tray assembly.

The 15454-FTA3-T fan-tray assembly can only be installed in ONS 15454 Release 3.1 shelf 
assemblies (15454-SA-ANSI, 800-19857) and later. It includes a pin that does not allow it to be 
installed in ONS 15454 shelf assemblies released before Release 3.1 (15454-SA-NEBS3E, 
15454-SA-NEBS3, and 15454-SA-R1, 800-07149). Installing the 15454-FTA3-T in a non-compliant 
shelf assembly can result in failure of the alarm interface panel (AIP), which, in turn, will result in 
power loss to the fan-tray assembly.

The 10-Gbps compatible shelf assembly (15454-SA-ANSI) and fan-tray assembly (15454-FTA3-T) 
are required with the ONS 15454 XC-10G, OC-192, and OC-48 any slot (AS) cards.