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TCX1000-RDM20 Cooling System Description

 

The cooling system in a TCX1000-RDM20 consists of two fan modules installed in the field-replaceable unit (FRU) panel and each power supply has a dual rotor counter-rotating fan in them.

In the TCX1000-RDM20’s cooling system, cool air enters through the vents in the front panel and hot air exhausts through the fans in the FRU panel. This type of airflow is known as airflow out or front-to-back airflow. When installed, the chassis must be positioned so that the FRUs are next to the hot air exhaust.

Note

Under normal operating conditions, the fan modules operate at a moderate speed. Temperature sensors in the chassis monitor the temperature within the chassis. The system raises an alarm if a fan module fails or if the ambient temperature inside the chassis rises above the acceptable range.

Fan Modules

The fan modules in a TCX1000-RDM20 are hot-removable and hot-pluggable FRUs. These fan modules can be hot-swapped—you do not need to power off the TCX1000-RDM20 or disrupt the TCX1000-RDM20 function to replace a fan module. The TCX1000-RDM20 continues to operate for a limited period of time (two minutes) during the replacement of the fan module without thermal shutdowns. Fan module slots are numbered 0 through 1 from left to right when viewing chassis from the FRU panel side (see Figure 1). Figure 2 shows the fan module for the TCX1000-RDM20.

Figure 1: Fan Numbering
Fan Numbering
Figure 2: Fan Module
Fan Module
Note

Both fan modules must be installed for optimal operation of the TCX1000-RDM20, if there is only one fan than there will be no redundancy.

Each TCX1000-RDM20 has a fan LED located to the left of the fan. Figure 3 shows the location of the LEDs on a TCX1000-RDM20. Use Table 1 to interpret the state of the fan LEDs.

Figure 3: Fan LEDs
Fan LEDs

Table 1: TCX1000-RDM20 Fan LED

Name

Color

State

Description

Fan LED (located left side of fan)

Unlit

Off

Fan is operating normally.

Red

On steadily

Fan module has failed.

Airflow Through the Chassis

In the TCX1000-RDM-20 cooling system, cool air enters through the vents in the port panel and hot air exhausts through the FRU panel. This type of airflow is known as airflow out or port-to-FRU airflow. When the chassis is installed, it must be positioned so that the FRUs are next to the hot aisle. Figure 2 shows the airflow through the chassis.

Figure 4: Chassis Airflow
Chassis Airflow