Cisco ONS 15454 SDH E1-75 Справочное руководство - Страница 15
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Chapter 1
Shelf and FMEC Hardware
1.10 Fan-Tray Assembly
1.10 Fan-Tray Assembly
The fan-tray assembly is located at the bottom of the ONS 15454 SDH. After you install the fan-tray
assembly, you only need to open the drawer if a fan fails, or if you need to replace or clean the fan-tray
air filter. Do not operate an ONS 15454 SDH without a fan-tray air filter. Refer to the "Maintenance"
chapter in the Cisco ONS 15454 SDH Procedure Guide for information about cleaning and maintaining
the fan-tray air filter.
The fan-tray assembly is a removable drawer that holds fans and fan-control circuitry for the
ONS 15454 SDH. Cisco recommends removing the front door of the chassis when removing or installing
the fan-tray assembly. 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. For STM-N cards, you can use the LCD to determine if a port is in working or protect
mode and is active or standby. It also displays whether the software load is SONET or SDH and the
software version number.
The temperature measured by the TCC2 sensors is displayed on the LCD screen.
See
Figure 1-10
for the position of the fan tray assembly.
Figure 1-10 Position of the Fan-Tray Assembly
F A N
F A IL
C R
IT
M A
J
M IN
LCD
Fan tray
assembly
Caution
Do not operate an ONS 15454 SDH without a fan-tray air filter. A fan-tray air filter is mandatory.
Cisco ONS 15454 SDH Reference Manual, R4.6
1-15
April 2008