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PTX10004 Cooling System

The PTX10004 cooling system components work together to keep all components within the acceptable temperature range. If the maximum temperature specification is exceeded and the system cannot be adequately cooled, the Routing and Control Board (RCB) shuts down some or all of the hardware components.

PTX10004 Cooling System and Airflow

The cooling system in a PTX10004 chassis consists of dual fan trays (JNP10004-FAN2) with matching dual fan tray controllers (JNP10004-FTC2). Each fan tray requires a companion fan tray controller to be installed and operational to be hot-insertable and hot-removable.

Fan Tray

The JNP10004-FAN2 fan tray contains an array of internal fans, a non-removable control board, and LEDs.

The two fan trays install vertically, side by side, next to the power supplies on the FRU side of the chassis. Two handles on each front faceplate facilitate handling of the fan tray. See Figure 1 and Figure 2.

Figure 1: JNP10004-FAN2 Fan TrayJNP10004-FAN2 Fan Tray
Figure 2: Installed Fan Trays on a PTX10004 Installed Fan Trays on a PTX10004
  1
Power supplies
  2
Fan trays

See Table 1 for the physical specifications of the fan trays.

Table 1: Fan Tray Specifications

Specification

JNP10004-FAN2

Corresponding fan tray controller model

JNP10004-FTC2

Number of fans per fan tray

6

Number of fans per chassis

12

Fan numbering

0 through 11

Volume flow at 100%

948 CFM for both fan trays

Introduced in Junos OS Release

20.3R1-EVO

Height

12.08 in. (30.68 cm)

Width

6.6 in. (16.8 cm)

Depth

5.5 in. (13.97 cm) without handles, 6.85 in. (17.4 cm) with handles

Weight

9.8 lb (4.45  kg)

The array of fans in both models operate as a single unit. If an individual fan in the array fails, the entire fan tray must be replaced. However, the fan tray continues to operate indefinitely and provides sufficient cooling even when a single rotor fails in a fan, provided the room temperature is within the operating range.

If you want to replace an existing fan tray while the router is running, remove only one fan tray. The router continues to operate for a limited time with a single operating fan tray without triggering a thermal alarm.

CAUTION:

To avoid a thermal alarm, do not remove both fan trays while the router is operating.

The internal fan control board in each fan tray contains the LEDs for the associated fan tray controllers and the LEDs for the three SIBs directly behind the fan tray.

Fan Tray Controller

The PTX10004 supports two fan tray controllers to provide the control logic and power to hot-insert and hot-remove a fan tray:

  • JNP10004-FTC2—Supports model JNP10004-FAN2; see Figure 3.

    Figure 3: Fan Tray Controller JNP10004-FTC2 Fan Tray Controller JNP10004-FTC2
Warning:

Do not mix the fan tray controller models. Use only the supported fan tray model for each fan tray controller. See Table 2.

Table 2: Fan Tray Controller Specifications

Specification

JNP10004-FTC2

Corresponding fan tray model

JNP10004-FAN2

Introduced in Junos OS Release

20.3R1-EVO

Height

1.5 in. (3.81 cm)

Width

6.5 in. (15.24 cm)

Depth

12.4 in. (31.5 cm)

Weight

1.1 lb (0.5 kg)

The system continually monitors the temperature of critical parts across the chassis and adjusts the chassis fan speed according to the temperature. Junos OS controls the fan speed. Under normal operating conditions, the fans in the fan tray run at less than full speed. If one fan tray controller fails or appears missing (such as when a SIB is being replaced), the other fan tray controller sets the fans to full speed. This allows the router to continue to operate normally as long as the remaining fans cool the chassis sufficiently. Use the show chassis fan command to see the status of individual fans and fan speed. The following examples show the fan status for a system running JNP10004-FAN2.

To determine the cooling of all the components in the system, use the show chassis environment command.

Airflow Direction in the PTX10004

The air intake to cool the chassis is located on the port (line card) side of the chassis. Air flows into the chassis from the ports in the Routing and Control Boards (RCBs) and line cards, through the Switch Interface Boards (SIBs), and exits from the fan trays and the power supplies. See Figure 4.

Figure 4: Airflow Through a PTX10004Airflow Through a PTX10004

The fan tray continues to operate indefinitely and provide sufficient cooling even when a single rotor fails, provided the room temperature is within the operating range. You can check the status of fans by viewing the LEDs on each fan tray. See PTX10004 Fan Tray LEDs and Fan Tray Controller LEDs.

You cannot replace a single fan. If one or more fans fail, you must replace the entire fan tray.

In addition to the fans in the fan trays, there is an internal fan in each power supply that also helps to cool components, such as the line cards.

PTX10004 Fan Tray LEDs and Fan Tray Controller LEDs

Each fan tray has a set of LEDs, and each corresponding fan tray controller also has a set of LEDs.

Fan Tray LEDs

Each fan tray has a set of five LEDs that represent the status of the fans in the fan tray, the fan tray controller, and three of the Switch Interface Boards (SIBs). The LEDs are located on the top left corner of each fan tray. Figure 5 shows the location of the LEDs on JNP10004-FAN2 fan trays.

Figure 5: Fan Tray JNP10004-FAN2 LEDs Fan Tray JNP10004-FAN2 LEDs
  1
Fan status LED
  3
SIB status LEDs (SIB 0 through SIB 2 for the left fan tray and SIB 3 through SIB 5 for the right fan tray)
  2
Fan tray controller status LED
 

Table 3 describes the functions of the fan tray LEDs.

Table 3: Fan Tray LEDs on a PTX10004

Name

Color

State

Description

FAN (fan status)

Green

On steadily

All fans are operating normally. The system has verified that the fan tray is engaged, that the airflow is in the correct direction, and that all fans are operating correctly.

Green

Blinking

The fan tray is starting up. The fan tray is not ready.

Amber

Blinking

An error has been detected in one or more fans in the fan tray. Replace the fan tray as soon as possible. Either the fan has failed or it has become disconnected. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace it.

Amber

Blipping

Beacon is enabled.

None

Off

The fan is not receiving power from the fan tray controller. All fans are off.

FTC (fan tray controller status)

Green

On steadily

Power is on. The fan tray controller is online and is operating normally.

Amber

Blinking

An error has been detected in the fan tray controller. Replace the fan tray controller as soon as possible. The fan tray controller is located behind the fan tray above the SIBs. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the fan tray controller.

Amber

Blipping

Beacon is enabled.

None

Off

The fan tray controller is not receiving power.

SIB Status (SIB 0 status)

Green

On steadily

The left-most SIB in the chassis is online.

Amber

Blinking

An error has been detected in SIB 0. Replace the SIB as soon as possible. The SIB is located behind the left fan tray and is the left-most SIB in the chassis. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the SIB.

Amber

Blipping

Beacon is enabled.

None

Off

The SIB is offline.

SIB Status (SIB 1 status)

Green

On steadily

The center SIB behind the left fan tray is online.

Amber

Blinking

An error has been detected in SIB 1. Replace the SIB as soon as possible. The SIB is located behind the left fan tray and is the middle SIB in the group of 3. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the SIB.

None

Off

The SIB is offline.

SIB Status (SIB 2 status)

Green

On steadily

The right-most SIB behind the left fan tray is online.

Amber

Blinking

An error has been detected in SIB 2. Replace the SIB as soon as possible. The SIB is located behind the left fan tray and is the right-most SIB in the group of 3. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the SIB.

Amber

Blipping

Beacon is enabled.

None

Off

The SIB is offline.

SIB Status (SIB 3 status)

Green

On steadily

The left-most SIB behind the right fan tray is online.

Amber

Blinking

An error has been detected in SIB 3. Replace the SIB as soon as possible. The SIB is located behind the right fan tray and is the left-most SIB of the group of 3. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the SIB.

Amber

Blipping

Beacon is enabled.

None

Off

The SIB is offline.

SIB Status (SIB 4 status)

Green

On steadily

The center SIB behind the right fan tray is online.

Amber

Blinking

An error has been detected in SIB 4. Replace the SIB as soon as possible. The SIB is located behind the right fan tray and is the middle SIB in the group of 3. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the SIB.

Amber

Blipping

Beacon is enabled.

None

Off

The SIB is offline.

SIB Status (SIB 5 status)

Green

On steadily

The right-most SIB behind the right fan tray is online.

Amber

Blinking

An error has been detected in SIB 5. Replace the SIB as soon as possible. The SIB is located behind the right fan tray and is the right-most SIB in the group of 3. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the SIB.

Amber

Blipping

Beacon is enabled.

None

Off

The SIB is offline.

Fan Tray Controller LEDs

The fan tray controller LEDs are visible only when the associated fan tray is removed. The fan tray controller LEDs are located on the right of the controller panel. Figure 6 shows the location of the LEDs on the JNP10004-FTC2 fan tray controller faceplate.

Figure 6: Fan Tray Controller LEDs on a PTX10004Fan Tray Controller LEDs on a PTX10004
  1
Fan tray controller power
  2
Fan tray controller status

Table 4 describes the functions of the fan tray controller LEDs.

Table 4: Fan Tray Controller LEDs on a PTX10004

Name

Color

State

Description

PWR (fan tray controller power)

Green

On steadily

The fan tray controller has power and is operating normally.

Amber

Blinking

A power error has been detected in the fan tray controller. Replace the fan tray controller as soon as possible. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the fan tray controller.

None

Off

The fan tray controller is not powered on or is not receiving power.

STATUS (fan tray controller status)

Green

On steadily

The fan tray controller is online and is operating normally.

Amber

Blinking

An error has been detected in the fan tray controller. Replace the fan tray controller as soon as possible. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace the fan tray controller.

None

Off

The fan tray controller is not receiving power.