Specifications

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Cisco ONS 15454 Installation and Operations Guide, R3.2
January 2005
Chapter 1 Hardware Installation
Fan-Tray Assembly Installation
The front of the fan-tray assembly has an LCD screen that provides slot and port-level information 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 and later shelf
assemblies (15454-SA-ANSI, 800-19857). It includes a pin that does not allow it to be installed in
ONS 15454 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 and later 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 and later
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 fans fail.
For fan tray replacement instructions, see the “Install the Fan-Tray Assembly” procedure on page 1-26.
The red Fan Fail LED clears after you install a working fan tray.
Fan speed is controlled by 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+ card
fails, the fans automatically shift to high speed. The temperature measured by the TCC+ sensors is
displayed on the LCD screen.
Procedure: Install the Bottom Brackets and Air Filter
The shelf assembly ships with bottom brackets that you should use to install the air filter. The bottom
brackets consist of two grooved metal pieces that attach to the bottom of the shelf assembly using three
screws each. When you use the bottom bracket to install the fan-tray air filter, you do not need to remove
the fan-tray assembly to access the air filter. Attach the brackets to the bottom of the shelf assembly
before installing the rack.
Although the filter will work if it is installed with either side facing up, Cisco recommends that you
install it with the metal bracing facing up to preserve the surface of the filter.