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PTX3000 Cooling System

PTX3000 Cooling System Description

In addition to the fan trays described below, each power supply module (PSM) contains one fan that cools the PSM.

Fan Trays

The cooling system contains two interchangeable, horizontal fan trays (Figure 1). Each fan tray contains 14 fans. If a fan fails or the temperature rises above the temperature thresholds, the speed of the remaining fans in the zone is automatically adjusted to keep the temperature within the acceptable range. All fan trays are hot-insertable and hot-removable.

Tip:

Use the show chassis temperature-thresholds to show the temperature thresholds for various components.

The PTX3000 contains two cooling zones.

  • Cooling zone 0—The upper fan tray (Fan Tray 0) cools the following components: the Routing Engine or RCB companion card installed in slot RE0, the Control Board or RCB installed in slot CB0, and the FPCs, PICs, and IPLCs in the upper card cage.

  • Cooling zone 1—The lower fan tray (Fan Tray 1) cools the following components: the Routing Engine or RCB companion card installed in slot RE1, the Control Board or RCB installed in slot CB1, SIBs, and the FPCs, PICs, and IPLCs in the lower card cage.

Figure 1: Fan TrayFan Tray
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Fan tray release latch

 

Airflow

Figure 2 shows the airflow through a chassis that has first-generation FPCs (FPC-SFF-PTX-P1-A and FPC-SFF-PTX-T) installed. Figure 3 shows the airflow through a chassis that has third-generation FPCs (FPC3-SFF-PTX) installed. Third-generation FPCs have air vents on the FPC faceplates to allow additional airflow. Figure 4 shows the airflow when four chassis are installed in a 4-post rack.

Figure 2: Airflow Through the Chassis with First-Generation FPCs InstalledAirflow Through the Chassis with First-Generation FPCs Installed
Figure 3: Airflow Through the Chassis with Third-Generation FPCs InstalledAirflow Through the Chassis with Third-Generation FPCs Installed
Figure 4: Side View of Airflow for Four Chassis in a 4-Post RackSide View of Airflow for Four Chassis in a 4-Post Rack
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Upper chassis 1

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Lower chassis 1

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Upper chassis 2

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Lower chassis 2

Air Filter

The cooling system contains an air filter (Figure 5), located in the front of the chassis above the Switch Interface Boards (SIBs). The air filter is hot-insertable and hot-removable.

Figure 5: Chassis Air FilterChassis Air Filter

The third-generation FPCs (FPC3-SFF-PTX) have air vents on the FPC faceplate, and have a field-replaceable air filter cover over the air vents (see Figure 6). First-generation FPCs do not have vents that require air filters.

Figure 6: Third-Generation FPC Air FilterThird-Generation FPC Air Filter
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Air filter cover

 

PTX3000 Fan Tray LEDs

The LEDs for the fan trays are located on the craft interface (Figure 7). See PTX3000 Craft Interface LEDs for more information.

Figure 7: Craft Interface Fan Tray LEDsCraft Interface Fan Tray LEDs
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FANTRAYS LEDs labeled 0 and 1