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PTX10002-60C Cooling System Description and Airflow

The cooling system in a PTX10002-60C consists of three 80-W fan modules in a fan tray and two counter-rotating fans housed in each of the power supplies.

The PTX10002-60C brings air into the vents in the port panel and exhausts warmed air through the field-replaceable units (FRU) panel. This type of airflow is known as airflow out or port-to-FRU airflow.

This topic describes:

Fan Modules

The fan modules in a PTX10002-60C are hot-removable and hot-insertable FRUs designed for port-to-FRU airflow. The fan modules numbered 0 through 2 are installed in the fan tray located next to the power supplies. Each fan module slot has a fan icon next to it.

Figure 1 shows the 2 U fan module for the PTX10002-60C.

Figure 1: PTX10002-60C Fan ModulePTX10002-60C Fan Module

You remove and replace a fan module from the FRU end of the chassis. The router continues to operate for a limited period of time (30 seconds) during the replacement of the fan module without thermal shutdown.

Note:

All fan modules must be installed for optimal operation of the router.

Table 1.

Table 1: PTX10002-60C Fan Module Description

Fan Module

Label on the Fan Module

Color of Fan Module Handle

Direction of Airflow in the Fan Module

Power Supplies

PTX10002-FAN

AIR OUT

Juniper Gold

Port-to-FRU airflow is where air enters on the end with the ports and exits on the end with fans (also known as airflow out).

All models only use power supplies that have gold-colored handles with AIR OUT labels.

PTX10002-60C Chassis Airflow

In data center deployments, position the router in such a manner that the AIR OUT labels on router components are next to the hot aisle. Figure 2 shows the airflow through the chassis.

Figure 2: Air Out Airflow Through the PTX10002-60C ChassisAir Out Airflow Through the PTX10002-60C Chassis

Fan Module Status

You can check the status of fan modules through the show system alarms or show chassis fancommands or by looking at the LEDs next to each fan module. For example:

Each router has a status LED (labeled ST) for each fan module on the left side of the corresponding fan module slot. It indicates the status of all the fan modules.

Figure 3 shows the location of the LED next to the PTX10002-60C fan module.

Figure 3: PTX10002-60C Fan Module LEDPTX10002-60C Fan Module LED
  1
Fan LED
 

Table 2

Table 2: PTX10002-60C Fan Module LED

Color

State

Description

Green

On steadily

The fan module is operating normally. The system has verified that the module is engaged, and that the fan is operating correctly.

Amber

On steadily

An error has been detected in the fan module. Replace the fan module as soon as possible. Either the fan has failed or it is seated incorrectly. To maintain proper airflow through the chassis, leave the fan module installed in the chassis until you are ready to replace it.

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. If the temperature inside the chassis rises above the threshold temperature, the system shuts down automatically.