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PTX10008 Cooling System

 

The PTX10008 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 shuts down some or all of the hardware components.

PTX10008 Cooling System and Airflow

The cooling system in a PTX10008 chassis consists of dual fan trays with matching dual fan tray controllers.

Two fan tray models (JNP10008-FAN, JNP10008-FAN2)and their associated fan tray controllers (JNP10008-FAN-CTLR, JNP10008-FTC2) are available and operate in systems with either JNP10008-SF switch fabric or the JNP10008-SF3 switch fabric. Each fan tray requires a companion fan controller to be installed and operational to be hot-insertable and hot-removable.

Fan Trays

There are two models of fan tray available for the PTX10008. The JNP10008-FAN, contains 11 fans in an array, a non-removable control board, and LEDs, (see. Figure 1). The fans in each JNP10008-FAN fan tray are numbered 0 through 20. The JNP10008-FAN operates with the JNP10008-SF switch fabric. The JNP10008-FAN2, contains an array of 22 fans, a non-removable control board, and LEDs, (see PTX10008 Status Panel). The fans in each JNP10008-FAN2 fan tray are numbered 0-21. You can run the JNP-100008-SF3 with either the JNP10008-SF or the JNP10008-SF3. 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.

The fan trays install vertically, side-by-side, next to the power supplies on the FRU side of the chassis. You can use the two handles on each front faceplate to help remove or replace a fan tray.

Figure 1: Installed JNP10008-FAN with JNP10K-PWR-AC Power Supplies in a PTX10008
Installed JNP10008-FAN with
JNP10K-PWR-AC Power Supplies in a PTX10008
  1
Power supplies
  2
Fan trays
Figure 2: Installed JNP10008-FAN2, with JNP10K-PWR-AC2 Power Supplies in an PTX10008 Router
Installed JNP10008-FAN2, with
JNP10K-PWR-AC2 Power Supplies in an PTX10008 Router
  1
Power supplies
  2
Fan trays

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

Table 1: Fan Tray Specifications

Specification

JNP10008-FAN

JNP10008-FAN2

Corresponding fan tray controller model

JNP10008-FAN-CTLR

JNP10008-FTC2

Number of fans per fan tray

11

22

Number of fans per chassis

22

44

Volume flow at 100%

1437.37 cubic feet per minute (CFM) per fan tray

1793 CFM per fan tray

Switch fabric compatibility

JNP10008-SF

JNP10008-SF or JNP10008-SF3

Introduced in Junos OS Release

15.1X53-D30

19.2R1-S1

Height

22.4 in. (56.9 cm)

22.4 in. (56.9 cm)

Width

6.6 in. (16.8 cm)

6.6 in. (16.8 cm)

Depth

4.0 in. (10.2 cm) without handles, 5.2 in. (13.2 cm) with handles

5.5 in. (13.97 cm) without handles, 6.7 in. (17.01 cm) with handles

Weight

11.8 lb (5.4 kg)

20 lb (9.07 kg)

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.

Caution

The chassis will shut down if a thermal alarm is raised for more than three minutes.

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 Controllers

The two fan tray controllers provide the control logic and power to hot-insert and hot-remove a fan tray. See Figure 3 and Figure 4.

There are two fan tray controller models:

  • JNP10008-FAN-CTRL—Supports model JNP10008-FAN; see Figure 3.

    Figure 3: Fan Tray Controller JNP10008-FAN-CTRL
    Fan Tray Controller JNP10008-FAN-CTRL
  • JNP10008-FTC2—Supports model JNP10008-FAN2; see Figure 4.

    Figure 4: Fan Controller JNP10008-FTC2
    Fan Controller JNP10008-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

JNP10008-FAN-CTRL

JNP10008-FTC2

Corresponding fan tray model

JNP10008-FAN

JNP10008-FAN2

Switch fabric compatibility

JNP10008-SF

JNP10008-SF or JNP10008-SF3

Introduced in Junos OS Release

15.1X53-D30

19.2R1

Height

1.5 in. (3.81 cm)

1.5 in. (3.81 cm)

Width

6.5 in. (15.24 cm)

6.5 in. (15.24 cm)

Depth

9.3 in. (23.62 cm)

9.4 in. (23.88 cm)

Weight

1.5 lb (0.68 kg)

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 software 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. See the following examples of show chassis fanshow the fan status for a system running JNP10008-FAN and JNP10008-FAN-CTRL:

  1. This example shows the output from a JNP10008-SF fabric system running JNP10008-FAN and JNP10008-FAN-CTRL and standard Junos OS.

  2. This example shows the output from a JNP10008-SF3 fabric system running JNP10008-FAN2 and JNP10008-FTC2 and standard Junos OS.

  3. This example shows the output from a JNP10008-SF3 fabric system running JNP10008-FAN2 and JNP10008-FTC2 and Junos OS Evolved.

Airflow Direction in the PTX10008

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 RCBs and line cards, through the Switch Interface Boards (SIBs), and exits from the fan trays and the power supplies. See Figure 5.

Figure 5: Airflow Through a PTX10008
Airflow Through a PTX10008

The fan tray continues to operate indefinitely and provide sufficient cooling even when a single fan 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 PTX10008 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.

PTX10008 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 LEDs that represent the status of the fans in the fan tray, the fan tray controller, and the three Switch Interface Boards (SIBs). The fan tray LEDs are located in the top left corner of each fan tray. Figure 6 shows the location of the LEDs on JNP10008-FAN fan trays. See Figure 7 for the location of LEDs on the JNP10008-FAN2 fan trays.

Figure 6: Fan Tray JNP10008-FAN LEDs
Fan Tray JNP10008-FAN
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
 
Figure 7: Fan Tray JNP10008-FAN2 LEDs
Fan Tray JNP10008-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 PTX10008 Router

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.

Yellow

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. To maintain proper airflow through the chassis, leave the fan tray installed in the chassis until you are ready to replace it.

None

Off

The fan is not receiving power from the fan tray controller.

FTC (fan tray controller status)

Green

On steadily

The fan tray controller is online and is operating normally.

Yellow

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.

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.

Yellow

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.

None

Off

The SIB is offline.

SIB Status (SIB 1 status)

Green

On steadily

The center SIB behind the left fan tray is online.

Yellow

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.

Yellow

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.

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.

Yellow

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 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 4 status)

Green

On steadily

The center SIB behind the right fan tray is online.

Yellow

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.

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.

Yellow

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.

None

Off

The SIB is offline.

Fan Tray Controller LEDs

All models of fan tray controller have the same 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 8 shows the location of the LEDs on the JNP10008-FAN-CTRL or the JNP10008-FTC2 fan tray controller faceplate.

Figure 8: Fan Tray Controller LEDs on a PTX10008
Fan Tray Controller
LEDs on a PTX10008
  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 PTX10008

Name

Color

State

Description

PWR (fan tray controller power)

Green

On steadily

The fan tray controller has power and is operating normally.

Yellow

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.

Yellow

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.