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AC Power Supply in QFX5120 Switches

 

QFX5120-32C, QFX5120-48T, and QFX5120-48Y switches support two 650-W AC or DC power supplies. Additionally, QFX5120-48T switches support two 850-W high-voltage power supplies with AC or DC input. QFX5120-48YM switches support two 850-W AC or DC power supplies. The power supplies support front-to-back or back-to-front airflow. The power supplies are fully redundant, load-sharing, and hot-removable and hot-insertable FRUs when the second power supply is installed and running. You can remove and replace them without powering off the switch or disrupting switch functions. We ship QFX5120 switch models with two AC or DC power supplies preinstalled in the rear panel of the chassis. This topic describes the AC power supplies supported on QFX5120 switches.

Caution

Do not mix:

  • AC and DC power supplies in the same chassis.

  • 650-W and 850-W power supplies in the same QFX5120-48T chassis.

  • Power supplies with different airflow directions in the same chassis.

  • Power supplies and fan modules with different airflow directions in the same chassis.

Characteristics of the AC Power Supply for QFX5120 Switches

You can install up to two power supplies in the power supply slots in the rear panel of the QFX5120 switch chassis. On QFX5120-32C switches, the slots are labeled PS0 and PS1. On QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches, the slots are labeled 0 and 1 and have a power icon next to them.

Note

You must install both the power supplies for optimal functioning of the switch.

If the switch is operational while you are replacing power supplies, you must remove only one power supply at a time.

Figure 1 shows the AC power supply for a QFX5120-32C switch.

Figure 1: AC Power Supply for QFX5120-32C Switches
AC Power Supply for
QFX5120-32C Switches
  1
Ejector lever
  3
AC power cord inlet
  2
Power supply handle
 

Figure 2 shows the AC power supply for QFX5120-48T and QFX5120-48Y switches.

Figure 2: AC Power Supply for QFX5120-48T and QFX5120-48Y Switches
AC Power Supply
for QFX5120-48T and QFX5120-48Y Switches
  1
Power supply handle
  3
Ejector lever
  2
AC power cord inlet
 

Figure 3 shows the AC power supply for QFX5120-48YM switches.

Figure 3: AC Power Supply for QFX5120-48YM Switches
AC Power Supply for
QFX5120-48YM Switches
  1
Power supply handle
  3
Ejector lever
  2
AC power cord inlet
  4
Power cord retainer

Table 1 lists the specifications of the AC power supplies used in QFX5120 switches.

Table 1: Specifications of the AC Power Supplies Used in QFX5120 Switches

Item

Specifications

Model number

  • QFX5120-32C: QFX520048Y-650W-AC-AFO or QFX520048Y-650W-AC-AFI

  • QFX5120-48T and QFX5120-48Y: JPSU-650W-AC-AO or JPSU-650W-AC-AI

  • QFX5120-48YM: JPSU-850W-AC-AFO or JPSU-850W-AC-AFI

Field-replaceable unit (FRU) type

Hot-insertable and hot-removable

Weight

  • QFX5120-32C: 2.1 lb (0.93 kg)

  • QFX5120-48T and QFX5120-48Y: 2.2 lb (0.98 kg)

  • QFX5120-48YM: 2.3 lb (1.04 kg)

Minimum installed in chassis

1

Maximum installed in chassis

2

Power supply slots

  • QFX5120-32C switches—Install power supply in slots labeled PS0 and PS1 in the rear panel of the chassis.

  • QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches—Install power supply in slots labeled 0 and 1 with a power icon next to them in the rear panel of the chassis.

Airflow

  • Front-to-back, indicated by the label F2B and a red handle in QFX5120-32C switches and by the label AIR OUT and a Juniper Gold handle in QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches.

  • Back-to-front, indicated by label B2F and a blue handle in QFX5120-32C switches and by the label AIR IN and a Juniper Azure Blue handle in QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches.

Status LEDs

  • QFX5120-32C switch—Bicolored LED

  • QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switch—AC, DC, and ! (fault)

To prevent electrical injury while installing or removing AC power supplies, carefully follow instructions in Connect Power to an AC-Powered QFX5120 Switch and Maintain the QFX5120 Power System.

AC Power Supply Airflow

Each power supply is cooled by its own internal cooling system.

Caution

Verify that the airflow direction in the power supplies matches the airflow direction in the fan modules. Ensure that each power supply that you install in the chassis has the same airflow direction. If you install power supplies with two different airflow directions, Junos OS raises an alarm. If you need to convert the airflow direction in a chassis, you must replace all the fan modules and power supplies with the other airflow direction and update the installation base (see Register Products—Mandatory to Validate SLAs).

Table 2 lists the AC power supplies used in QFX5120 switches and the direction of airflow in them. The power supplies have color-coded handles and labels that indicate the direction of the airflow.

Table 2: Airflow Direction in AC Power Supplies for QFX5120 Switches

Power Supply

Color of the Power Supply Handle

Label

Direction of Airflow

QFX5120-32C—

QFX520048Y-

650W-AC-AFO

Red

F2B

Front-to-back—Cold air intake to cool the chassis is through the vents on the front panel of the chassis and hot air exhausts through the vents on the rear panel of the chassis.

QFX5120-48T

and QFX5120-48Y—

JPSU-650W-AC-AO

Juniper Gold

AIR OUT

QFX5120-48YM—

JPSU-850W-AC-AFO

Juniper Gold

AIR OUT

QFX5120-32C—

QFX520048Y-

650W-AC-AFI

Blue

B2F

Back-to-front—Cold air intake to cool the chassis is through the vents on the rear panel of the chassis and hot air exhausts through the vents on the front panel of the chassis.

QFX5120-48T

and QFX5120-48Y—

JPSU-650W-AC-AI

Juniper Azure Blue

AIR IN

QFX5120-48YM—

JPSU-850W-AC-AFI

Juniper Azure Blue

AIR IN