Installing Power Supplies; Removing And Installing Fan Modules; Switch, And The Cisco Mds 9120 Switch - Cisco MDS9120 - MDS 9120 Multilayer Fabric Switch Installation Manual

Removing and Installing Components
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m

Installing Power Supplies

To install the 300-W DC-input power supplies, follow these steps:
Step 1 Turn OFF the DC power source and connect the two DC wires to the DC power supply terminal blocks.
Note
Slide the power supply into the power supply bay. Make sure that the power supply is fully seated in the
Step 2
bay. Turn ON the DC power supply source and ensure that the input LED is green and indicates an OK
condition, but the output LED is red.
Step 3 Switch off the DC power source and switch it on again.
Step 4 Ensure that the output LED is green. The switch can now receive the down converted 12 VDC from the
inserted DC power supply.
Step 5 Tighten the power supply captive screw.
Step 6 Verify power supply operation by checking that the power supply (P/S) LED in the front panel is green.
If the LED is not green, see the Cisco MDS 9000 Family Troubleshooting Guide.

Removing and Installing Fan Modules

This section provides instructions for removing and installing the fan modules for the Cisco MDS 9148
Switch, Cisco MDS 9140 Switch and the Cisco MDS 9120 Switch. The Cisco MDS 9124 Switch does
not have field-replaceable fan modules.
Removing a Fan Module on the Cisco MDS 9148 Cisco MDS 9140 Switch, the Cisco MDS 9134

Switch, and the Cisco MDS 9120 Switch

The fan module is designed to be removed and replaced while the system is operating without presenting
an electrical hazard or damaging the system.
Caution The Cisco MDS 9000 Family has internal temperature sensors that are capable of shutting down the
system if the temperature at different points within the chassis exceed certain safety thresholds. To be
effective, the temperature sensors require the presence of airflow; therefore, in the event a fan module is
removed from the chassis, the Cisco MDS 9000 Family will be shut down after five minutes to prevent
potentially undetectable overheating. However, the switches will shut down sooner if the higher-level
temperature threshold is exceeded.
When removing the fan tray, keep your hands and fingers away from the spinning fan blades. Let the
Warning
fan blades completely stop before you remove the fan tray. Statement 258
To remove the existing fan module, follow these steps:
Cisco MDS 9100 Series Hardware Installation Guide
2-32
Ensure that the system (earth) ground connection has been made.
Chapter 2 Installing the Cisco MDS 9100 Series
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