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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
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Chapter 1 Cisco ONS 15310-MA SDH Shelf Assembly Hardware
Fan-Tray Assembly
Figure 1-13 Installing the Extended Cable Management Bracket
1.10 Fan-Tray Assembly
The fan-tray assembly is located at the top of the ONS 15310-MA SDH shelf assembly, under the air
filter, rear exhaust, and air inlet. The fan tray is a removable drawer that holds four fans, the fan-control
circuitry, and the fuse-control circuitry for the ONS 15310-MA SDH. After you install the fan tray, you
should only need to access it if a fan failure occurs.
The new fan-tray assembly (FTA2) has a fuse-control circuitry that is capable of blowing a low-current
fuse (1/4-A to 1/2-A). This is useful when you are using power distribution equipment that has a low
current fuse connected in parallel with the main fuse to help detect any failures in the main fuse. The
fuse-control circuitry independently draws a short current (approximately 900 mA) for about 0.7 seconds
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