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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter1 Hardware Installation
Fan-Tray Assembly Installation
1.7 Fan-Tray Assembly Installation
The fan-tray assembly is located at the bottom of the ONS 15454 front compartment. The fan tray is a
removable drawer that holds fans and fan-control circuitry for the ONS 15454. The fro nt door can be
left in place when removing or installing the fan tray but removal is recommended. After you install the
fan tray, 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 informat ion for
all ONS 15454 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. See the Cisco
ONS 15454 Troubleshooting and Maintenance Guide for information about cleaning and maintaining the
fan-tray air filter.
Note The 10-Gbps compatible shelf assembly (15454-SA-ANSI, P/N: 800-19857) and fan-tray assembly
(15454-FTA3) are required with the ONS 15454 XC10G, OC-192, and OC-48 any slot (AS) cards.
Caution Do not operate an ONS 15454 without a fan-tray filter. A fan-tray filter is mandatory.
Caution The 15454-FTA3 fan-tray assembly can only be installed in ONS 15454 Release 3.1 shelf assemblies
(15454-SA-ANSI, 800-19857). It includes a pin that does not allow it to be installed in ONS 154 54
shelf assemblies released before ONS 15454 Release 3.1 (15454-SA-NEBS3E, 15454-SA-NEBS3,
and 15454-SA-R1, P/N 800-0714915454). Installing the 15454-FTA3 in a non-compliant shelf
assembly may result in failure of the alarm interface panel (AIP), which in turn, will result in power
loss to the fan-tray assembly.
Note The ONS 15454 Release 3.1 fan-tray assembly (15454-FTA3) is not I-temp. To obtain an I-temp fan
tray, install the 15454-FTA2 fan-tray assembly in an ONS 15454 Release 3.1 shelf assembly (P/N:
800-19857). However, do not install the ONS 15454 Release 3.1 XC10G, OC-192, and OC-48 any
slot (AS) cards in the shelf assembly with the 15454-FTA2 fan-tray assembly.
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 fan s fail.
For fan tray replacement instructions, see the “Install the Fan-Tray Assembly” procedure on page1-27.
The red Fan Fail LED clears after you install a working fan tray.
Fan speed is controlled by TCC+ card temperature sensors. The sensors me asure the in put air
temperature at the fan-tray assembly. Fan speed options are low, medium, and high. If t he T CC+ car d
fails, the fans automatically shift to high speed. The temperature measured by the TCC+ sensors is
displayed on the LCD screen.