Cisco ONS 15454 SDH Specifications Page 50

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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Chapter 1 Hardware Installation
Fan-Tray Assembly Installation
1.6 Fan-Tray Assembly Installation
The fan-tray assembly is located at the bottom of the ONS 15454 SDH front compartment. The fan-tray
assembly is a removable drawer that holds fans and fan-control circuitry for the ONS 15454 SDH. You
do not need to remove the front door when removing or installing the fan-tray assembly, but Cisco
recommends removal.
Note When you have finished installing/servicing the shelf assembly, reinstall the FMEC cover faceplate.
The door provides security for the electrical connections.
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.
The front of the fan-tray assembly has an LCD screen that provides slot and port-level information for
all ONS 15454 SDH card slots, including the number of critical, major, and minor alarms.
The fan-tray assembly features an air filter at the bottom of the tray that you can install and remove by
hand. Remove and visually inspect this filter every 30 days and keep spare filters in stock. Consult the
maintenance chapter of the Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide for
information about cleaning and maintaining the fan-tray air filter.
Caution Do not operate an ONS 15454 SDH without a fan-tray air filter. A fan-tray air filter is mandatory.
Note An error message appears on the TCC-I and in CTC when the fan-tray assembly is removed from the
shelf
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 assembly illuminates when one or more
fans fail. To replace the fan-tray assembly, see the Install the Fan-Tray Assembly Procedure on
page 1-19. The red Fan Fail LED clears after you install a working fan-tray assembly.
Note An error message appears on the TCC-I, fan-tray LED, and in CTC when one fan is deactivated or
mechanically blocked.
Fan speed is controlled by TCC-I 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-I card
fails, the fans automatically shift to high speed. The temperature measured by the TCC-I sensors is
displayed on the LCD screen.
To install or replace the fan-tray assembly, it is not necessary to move the cable management facilities.
You can remove the fan-tray assembly using the retractable handles.
Caution Do not force a fan-tray assembly into place. This can damage the connectors on the fan-tray assembly
and/or the connectors on the back panel of the shelf assembly.
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