MX10004 Cooling System

The MX10004 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.

MX10004 Cooling System and Airflow

The cooling system in an MX10004 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
Fan Tray Controller
Airflow Direction in the MX10004

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 rear 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 Tray

Figure 2: Installed Fan Trays on an MX10004

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Power supplies

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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 percent	948 CFM for both fan trays
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 fan tray operates as a single unit. If an individual fan in the tray fails, you must replace the entire fan tray. However, the fan tray continues to operate indefinitely and provides sufficient cooling even when a single fan rotor fails. The fan tray operates indefinitely provided that 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 triggering a thermal alarm, remove only one fan tray while the router is operating.

Fan Tray Controller

The MX10004 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

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
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 , the other fan tray controller sets the fans to full speed. (A fan tray can appear to be missing when you replace an SFB, for example.) The ability to modify fan speed 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 fan speed.

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

Airflow Direction in the MX10004

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 Fabric Boards (SFBs), and exits from the fan trays and the power supplies. See Figure 4.

Figure 4: Airflow Through an MX10004

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.

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, an internal fan in each power supply also helps to cool components such as line cards.

MX10004 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
Fan Tray Controller 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 Fabric Boards (SFBs) that are installed behind the fan tray. 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

1 — Fan status LED	3 — SFB status LEDs - The SIB STATUS LEDs on the left fan tray display the status of the three SFBs installed in SFB 0 through SFB 2 and the SIB STATUS LEDs on the right fan tray display the status of the three SFBs installed in SFB 3 through SFB 5.
2 — Fan tray controller status LED

Table 3 describes the functions of the fan tray LEDs.

Table 3: Fan Tray LEDs on an MX10004
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. 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	Blinking	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 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.
	Amber	Blipping	Beacon is enabled.
	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.
	Amber	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.
	Amber	Blipping	Beacon is enabled.
	None	Off	The SFB is offline.
SIB Status (SFB 1 status)	Green	On steadily	The center SFB behind the left fan tray is online.
	Amber	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 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 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.
	Amber	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 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 SFB.
	Amber	Blipping	Beacon is enabled.
	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.
	Amber	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 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 SFB.
	Amber	Blipping	Beacon is enabled.
	None	Off	The SFB is offline.
SIB Status (SFB 4 status)	Green	On steadily	The center SFB behind the right fan tray is online.
	Amber	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 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 SFB.
	Amber	Blipping	Beacon is enabled.
	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.
	Amber	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 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 SFB.
	Amber	Blipping	Beacon is enabled.
	None	Off	The SFB 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 an MX10004

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Fan tray controller power

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Fan tray controller status

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

Table 4: Fan Tray Controller LEDs on an MX10004
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.

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MX10004 Cooling System