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MX10016 Cooling System

 

The MX10016 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. For more information, see the following topics:

MX10016 Cooling System and Airflow

The cooling system in an MX10016 chassis consists of two fan trays and two fan tray controllers. An MX10016 has an air filter on the front panel. The fans in each fan tray are numbered 0 through 10.

Two fan tray models and their associated fan tray controllers are available. All models are hot-insertable and hot-removable. See Table 1.

Table 1: Fan Tray Specifications

Specification

JNP10016-FAN

JNP10016-FAN2

Corresponding fan tray controller model

JNP10016-FAN-CTLR

JNP10016-FTC2

Chassis supported

Enhanced or standard

Enhanced or standard

Number of fans per fan tray

11

22

Number of fans per chassis

22

44

Volume flow at 100%

2,744.07 CFM per fan tray

3,423 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

19.8 lb (8.98 kg)

33.8lb (15.33 kg)

The JNP10016-FAN2 and JNP10016-FAN2-CTRL are optimized to work best in the enhanced chassis, but are backwards compatible to work in the standard chassis. To determine which chassis you have, see MX10016 Status Panel LEDs.

MX10016 Fan Trays

Each fan tray is a hot-insertable and hot-removable FRU. Each fan tray contains 21 fans (0-20), a non-removable Control Board, and LEDs.

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

Figure 1: MX10016 Fan Tray
 MX10016 Fan Tray

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 3 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.

MX10016 Fan Tray Controllers

Two fan tray controllers provide the control logic and power to hot-insert and hot-remove a fan tray. The fans in each fan tray are numbered 0 through 20.

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 enables 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 the fan speed. For example:

Two fan tray controller models and their associated fan trays are available. All models are hot-insertable and hot-removable. See Table 2.

Table 2: Fan Tray Controller Specifications

Specification

JNP10016-FAN-CTRL

JNP10016-FTC2

Corresponding fan tray model

JNP10016-FAN

JNP10016-FAN2

Chassis supported

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)

2.3 lb (1.04 cm)

Airflow Direction in an MX10016

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 Control Boards and line cards, through the Switch Fabric Boards (SFBs), and exits from the fan trays and the power supplies. This airflow is called port-to-FRU cooling or airflow out (AFO). See Figure 2.

Figure 2: Airflow Through an MX10016
Airflow Through an MX10016

The fan tray continues to operate indefinitely and provides sufficient cooling even when a single fan fails, provided the room temperature is within the operating range. You can check the status of the fans by viewing the LEDs on each fan tray. See MX10016 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.

MX10016 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. This topic covers:

MX10016 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 3 shows the location of the LEDs on the fan tray.

Figure 3: Fan Tray LEDs on an MX10016
Fan Tray LEDs on an
MX10016
  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)
  2
Fan tray controller status
 

Table 3 describes the functions of the fan tray LEDs.

Table 3: Fan Tray LEDs on an MX10016

Name

Color

State

Description

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.

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 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.

SFB 0 status

Green

On steadily

The leftmost 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 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.

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.

SFB 2 status

Green

On steadily

The rightmost 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 rightmost 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.

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 leftmost 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.

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.

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.

MX10016 Fan Tray Controller 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. See Figure 4.

Figure 4: Fan Tray Controller LEDs on an MX10016
Fan Tray Controller
LEDs on an MX10016
  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 MX10016

Name

Color

State

Description

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.

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.