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MX10008 Cooling System

 

The MX10008 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.

MX10008 Cooling System and Airflow

The cooling system in an MX10008 chassis consists of dual fan trays with matching dual fan tray controllers.

Two fan tray models and their associated fan tray controllers are available. Fan tray model JNP10008-FAN works with its companion fan tray controller JNP10008-FAN-CTRL. Likewise, fan tray model JNP10008-FAN2 works with fan tray controller JNP10008-FTC2. Each fan tray requires a companion fan controller to be installed and operational to be hot-insertable and hot-removable.

Fan Tray

Both fan tray models contain 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: Installed JNP10008-FAN, with JNP10K-PWR-AC Power Supplies in an MX10008 Router
Installed JNP10008-FAN, with
JNP10K-PWR-AC Power Supplies in an MX10008 Router
  1
Power supplies
  2
Fan trays
Figure 2: Installed JNP10008-FAN2, with JNP10K-PWR-AC2 Power Supplies in an MX10008 Router
Installed JNP10008-FAN2, with
JNP10K-PWR-AC2 Power Supplies in an MX10008 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

Fan numbering

0 through 20

0 through 21

Volume flow at 100%

1437.37 CFM per fan tray

1793 CFM per fan tray

Introduced in Junos OS Release

15.1X53-D30

19.2R1-

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)

. 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.

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 LEDs for the associated fan tray controllers and LEDs for the three SFBs directly behind the fan tray.

Fan Tray Controller

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

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

Chassis supported

Enhanced or standard

Enhanced or standard

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.

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 an SFB 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. Here is an example of output from JNP10008-FAN and JNP10008-FAN-CTRL:

The following is similar output from a JNP10008-FAN2 and JNP10008-FTC2 system:

Airflow Direction in the MX10008 Router

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 fabric boards (SFBs), and exits from the fan trays and the power supplies.. See Figure 5.

Figure 5: Airflow Through an MX10008 Router
Airflow Through an MX10008
Router

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 MX10008 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 fan trays, there is an internal fan in each power supply that also helps to cool components, such as the line cards.

MX10008 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 of the two fan trays have a set of LEDs that represent the status of the fans in the fan tray, the fan tray controller, and the three Switch Fabric Boards (SFBs). The fan tray LEDs are located in the top left corner of each fan tray. Figure 6 shows the location of the LEDs on the JNP10008-FAN fan tray. See Figure 7.for the location of LEDs on the JNP10008-FAN2 fan tray.

Figure 6: Fan Tray JNP10008-FAN LEDs on an MX10008 Router
Fan Tray JNP10008-FAN
LEDs on an MX10008 Router
  1
Fan status LED
  3
SFB status (SFB 0 through SFB 2 for the left fan tray and SFB 3 through 5 for the right fan tray). The hardware label for SFB status is SIB STATUS.
  2
Fan tray controller status
 
Figure 7: Fan Tray JNP10008-FAN2 LEDs on an MX10008 Router
Fan Tray JNP10008-FAN2 LEDs on an
MX10008 Router
  1
Fan status LED
  3
SFB status (SFB 0 through SFB 2 for the left fan tray and SFB 3 through 5 for the right fan tray). The hardware label for SFB status is SIB STATUS.
  2
Fan tray controller status
 

Table 3 describes the functions of the fan tray LEDs.

Table 3: Fan Tray LEDs on an MX10008 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.

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

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 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.

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.

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

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 SFBs. 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 (SFB 0 status)

Green

On steadily

The left-most SFB in the chassis is online.

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

Yellow

Blinking

An error has been detected in SFB 0. Replace the SFB as soon as possible. The SFB is located behind the left fan tray and is the left-most SFB 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 SFB.

None

Off

The SFB is offline.

SIB Status (SFB 1 status)

Green

On steadily

The center SFB behind the left fan tray is online.

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

Yellow

Blinking

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

None

Off

The SFB is offline.

SIB Status (SFB 2 status)

Green

On steadily

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

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

Yellow

Blinking

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

None

Off

The SFB is offline.

SIB Status (SFB 3 status)

Green

On steadily

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

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

Yellow

Blinking

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

None

Off

The SFB is offline.

SIB Status (SFB 4 status)

Green

On steadily

The center SFB behind the right fan tray is online.

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

Yellow

Blinking

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

None

Off

The SFB is offline.

SIB Status (SFB 5 status)

Green

On steadily

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

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

Yellow

Blinking

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

None

Off

The SFB is offline.

Fan Tray Controller LEDs

All models of fan tray controller have the same LEDs. The fan tray controller LEDs are only visible 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 fan tray controller panel.

Figure 8: JNP10008-FAN-CTRL LEDs on an MX10008 Router
JNP10008-FAN-CTRL
LEDs on an MX10008 Router
  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 an MX10008 Router

Name

Color

State

Description

PWR (fan 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.

Green

Blinking

The beacon feature is enabled. This feature is enabled using the request chassis beacon command.

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.