Table of Contents
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Chapter 1
Product Overview
Cisco ONS 15540 ESPx Chassis
Fan Assembly
The fan assembly is located at the bottom of the chassis and contains eight
individual fans and a fan controller board. (See
Figure
1-2.) The controller board
monitors the status of each fan and reports the status to the processor cards. If a
single fan fails, a minor alarm is reported to the processor card. If two or more
fans fail, a major alarm is reported to the processor card. To prevent damage to the
cards and modules in the shelf when two or more fans fail, you can configure the
system to automatically reset or power off the transponder modules. The
transponder modules power off if the hardware version of the line card
motherboard is 5.1 or later, otherwise the transponder modules reset. Use the
show hardware command to determine the hardware version of the 2.5-Gbps line
card motherboards.
Figure 1-2
Fan Assembly
To recover from fan failure shutdown, you must power-cycle the shelf.
Because the system does not know which fans have failed, all of the cards and
Note
modules on the shelf are powered down or reset.
The fan failure shutdown feature disrupts traffic on the shelf when two or more fans
Caution
fail.
Cisco ONS 15540 ESPx Hardware Installation Guide
1-4
78-16436-01
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