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EX4650 Power System

AC Power Supply in EX4650 Switches

EX4650 switches support two AC or DC power supplies with different airflow directions. Power supplies for the EX4650 switch are fully redundant, load-sharing, and hot-removable and hot-insertable FRUs. The EX4650 switch models are shipped with two power supplies pre-installed in the rear panel of the chassis.

AC Power Supply in EX4650 Switches

EX4650 switch supports two 650 W AC power supplies.

Figure 1 shows an AC power supply for an EX4650 switch.

Figure 1: AC Power Supply for an EX4650 SwitchAC Power Supply for an EX4650 Switch

DC Power Supply in EX4650 Switches

The DC power supply in EX4650 is 650 W with dual feeds for power resiliency. Figure 2 shows a DC power supply for an EX4650 switch.

Figure 2: DC Power Supply for an EX4650 SwitchDC Power Supply for an EX4650 Switch
Note:

The DC power supply in the switch has four terminals labeled V-, V-, V+, and V+ for connecting DC power source cables labeled and negative (–) and positive (+). See Figure 3.

Figure 3: DC Power Supply Faceplate of an EX4650 SwitchDC Power Supply Faceplate of an EX4650 Switch
  1

AFI

  5

Fault LED

  2

Input terminals

  6

Ouput LED

  3

Ejector lever

  7

Input LED

  4

ESD grounding point

 

Airflow Direction in Power Supplies

Each power supply has two fan supplies and is cooled by its own internal cooling system.

The power supplies either have labels on the handles that indicate the direction of airflow or they have color-coded handles with a fan icon. AIR IN (AFI) label or a blue-colored handle indicates back-to-front airflow while AIR OUT (AFO) label or a gold-colored handle indicates front-to-back airflow. See Figure 4

Figure 4: Power Supply Handle DetailPower Supply Handle Detail
  1

AIR IN (AFI) label

 

Be sure to use the correct power supply for your chassis product SKU (see Table 1).

CAUTION:

Do not mix:

  • AC and DC power supplies in the same chassis.

  • Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

  • Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

CAUTION:

Verify that the airflow direction on the power supply handle matches the direction of airflow in the chassis. Ensure that each power supply 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 pattern on a chassis, you must replace all the fans and power supplies at one time to use the new direction.

Table 1 lists the AC and DC power supplies used in EX4650 switches and the direction of airflow in them.

Table 1: Airflow Direction in Power Supplies for EX4650 Switches

Product Number

Direction of Airflow

Color of Power Supply Handle

EX4650-48S-AFO

Back to front

Juniper Gold

EX4650-48S-AFI

Front to back

Juniper Azure Blue

EX4650-48S-DC-AFO

Back to front

Juniper Gold

EX4650-48S-DC-AFI

Front to back

Juniper Azure Blue

AC Power Supply Specifications for EX4650 Switches

EX4650 switches support 650 W AC power supplies.

The table in this topic provides power supply specification of AC power supplies used in an EX4650 switch:

Table 2: Power Supply Specifications of 650 W AC Power Supplies for EX4650 Switches

Item

Specification

AC input voltage

Operating range: 100 VAC to 240 VAC

AC input line frequency

50–60 Hz

AC input current rating

7.8A at 100-120 VAC

3.8A at 200-240 VAC

Typical Power Consumption

260W

Maximum power

450W

AC Power Cord Specifications for EX4650 Switches

A detachable AC power cord is supplied with the AC power supplies. The coupler is type C13 as described by International Electrotechnical Commission (IEC) standard 60320. The plug end of the power cord fits into the power source outlet that is standard for your geographical location.

CAUTION:

The AC power cord provided with each power supply is intended for use with that power supply only and not for any other use.

Note:

In North America, AC power cords must not exceed 4.5 meters in length, to comply with National Electrical Code (NEC) Sections 400-8 (NFPA 75, 5-2.2) and 210-52 and Canadian Electrical Code (CEC) Section 4-010(3). The cords supplied with the switch are in compliance.

Table 3 gives the AC power cord specifications for the countries and regions listed in the table.

Table 3: AC Power Cord Specifications

Country/Region

Electrical Specifications

Plug Standards

Juniper Model Number

Argentina

250 VAC, 10 A, 50 Hz

IRAM 2073 Type RA/3

CBL-EX-PWR-C13-AR

Australia

250 VAC, 10 A, 50 Hz

AS/NZZS 3112 Type SAA/3

CBL-EX-PWR-C13-AU

Brazil

250 VAC, 10 A, 50 Hz

NBR 14136 Type BR/3

CBL-EX-PWR-C13-BR

China

250 VAC, 10 A, 50 Hz

GB 1002-1996 Type PRC/3

CBL-EX-PWR-C13-CH

Europe (except Italy, Switzerland, and United Kingdom)

250 VAC, 10 A, 50 Hz

CEE (7) VII Type VIIG

CBL-EX-PWR-C13-EU

India

250 VAC, 10 A, 50 Hz

IS 1293 Type IND/3

CBL-EX-PWR-C13-IN

Israel

250 VAC, 10 A, 50 Hz

SI 32/1971 Type IL/3G

CBL-EX-PWR-C13-IL

Italy

250 VAC, 10 A, 50 Hz

CEI 23-16 Type I/3G

CBL-EX-PWR-C13-IT

Japan

125 VAC, 12 A, 50 Hz or 60 Hz

SS-00259 Type VCTF

CBL-EX-PWR-C13-JP

Korea

250 VAC, 10 A, 50 Hz or 60 Hz

CEE (7) VII Type VIIGK

CBL-EX-PWR-C13-KR

North America

125 VAC, 13 A, 60 Hz

NEMA 5-15 Type N5-15

CBL-EX-PWR-C13-US

South Africa

250 VAC, 10 A, 50 Hz

SABS 164/1:1992 Type ZA/13

CBL-EX-PWR-C13-SA

Switzerland

250 VAC, 10 A, 50 Hz

SEV 6534-2 Type 12G

CBL-EX-PWR-C13-SZ

Taiwan

125 VAC, 11 A and 15 A, 50 Hz

NEMA 5-15P Type N5-15P

CBL-EX-PWR-C13-TW

United Kingdom

250 VAC, 10 A, 50 Hz

BS 1363/A Type BS89/13

CBL-EX-PWR-C13-UK

Figure 5 illustrates the plug on the power cord for some of the countries or regions listed in Table 3.

Figure 5: AC Plug TypesAC Plug Types

AC Power Supply LEDs in EX4650 Switches

Figure 6 shows the location of the LEDs on an AC power supply for EX4650 switches.

Figure 6: LEDs on AC power supply for EX4650 switches LEDs on AC power supply for EX4650 switches
  1

AC OK

  3

Fault

  2

DC OK

 

Table 4 describes the AC power supply LEDs.

Table 4: AC Power Supply LEDs in EX4650 Switches

LED

Color

State

Description

AC OK

Unlit

Off

The power supply is disconnected from power, or power is not coming into the power supply.

Green

On steadily

Power is coming into the power supply.

DC OK

Unlit

Off

The power supply is disconnected from power, or power is not coming into the power supply.

Green

On steadily

The power supply is sending out power correctly.

Fault

Amber

On steadily

An error has been detected in the power supply. Replace the power supply as soon as possible. To maintain proper airflow through the chassis, leave the power supply installed in the chassis until you are ready to replace it.

Note:

If the AC OK LED and the AC OK LED are not lit green, either the AC power cord is not installed properly or the power input voltage is not within normal operating range.

If the AC OK LED is lit green and the AC OK LED is unlit or lit red, the AC power supply is installed properly, but the power supply has an internal failure.

DC Power Supply in EX4650 Switches

The DC power supply in EX4650 switches is a hot-insertable and hot-removable field-replaceable unit (FRU): You can install it without powering off the switch or disrupting the switching function.

All the EX4650 switches that are powered by DC power supplies are shipped with one DC power supply pre-installed in the rear panel of the switches.

CAUTION:

Do not mix:

  • AC and DC power supplies in the same chassis

  • Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

  • Fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

  • Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

This topic includes:

Characteristics of a DC Power Supply

EX4650 switches support 550 W DC power supply (see Figure 7).

Figure 7: DC Power Supply for an EX4650 SwitchDC Power Supply for an EX4650 Switch

You can install up to two DC power supplies in an EX4650 switch. Power supplies are installed in the power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis.

Table 5 lists the details of the 550 W DC power supplies used in EX4650 switches.

Table 5: Details of the DC Power Supplies in EX4650 Switches

Details

550 W DC Power Supply

Model number

  • JPSU-550-DC-AFO-A

  • JPSU-550-DC-AFI-A

Field-replaceable unit (FRU) type

Hot-insertable and hot-removable

Power supply weight

2.43 lb (1.1 kg)

Minimum installed in chassis

1

Maximum installed in chassis

2

Power supply slots

Install in power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis.

Fans

Internal

Airflow

  • Front-to-back, indicated by label AIR OUT (AFO)

  • Back-to-front, indicated by label AIR IN (AFI)

Power supply status LEDs

AC OK and DC OK

DC input current rating

4 A

Operating range

–38 through –60 VDC

Note:

The minimum input power required to power on the switch is –43.5 +/– 0.5 VDC. After the switch is powered on, the operating range is –38 through –60 VDC.

DC Power Supply Airflow

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

Each power supply has a label AIR OUT (AFO) or AIR IN (AFI) on the faceplate of the power supply that indicates the direction of airflow in the power supply.

Table 6 lists the DC power supply models and the direction of airflow in them.

Table 6: Airflow Direction in DC Power Supply Models for EX4650 Switches

Model

Label on Power Supply

Direction of Airflow

JPSU-550-DC-AFO-A

AIR OUT (AFO)

Front-to-back—that is, 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.

JPSU-550-DC-AFI-A

AIR IN (AFI)

Back-to-front—that is, 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.

DC Power Supply in EX4650 Switches

EX4650 switches support two DC power supplies with either front-to back or back-to-front airflow. Power supplies for the EX4650 switch are fully redundant, load-sharing, and hot-removable and hot-insertable FRUs. The EX4650 switch models are shipped with two power supplies preinstalled in the rear panel of the chassis.

DC Power Supply in EX4650 Switches

The DC power supply in EX4650 is 650 W with dual feeds for power resiliency. Figure 8 shows a DC power supply for an EX4650 switch.

Figure 8: DC power supply for an EX4650 switchDC power supply for an EX4650 switch
Note:

The DC power supply in the switch has four terminals labeled V-, V-, V+, and V+ for connecting DC power source cables labeled positive (+) and negative (–) as shown in Figure 9.

Figure 9: DC power supply faceplate of an EX4650 switchDC power supply faceplate of an EX4650 switch
  1

AFI

  5

Fault LED

  2

Input terminals

  6

Ouput LED

  3

Ejector lever

  7

Input LED

  4

ESD grounding point

 

Airflow Direction in Power Supplies

Each power supply has two fan supplies and is cooled by its own internal cooling system.

The power supplies either have labels on the handles that indicate the direction of airflow or they have color-coded handles with a fan icon. AIR IN (AFI) label or a blue-colored handle indicates back-to-front airflow while AIR OUT (AFO) label or a gold-colored handle indicates front-to-back airflow. See Figure 10

Figure 10: Power supply handle detailPower supply handle detail
  1

AIR IN (AFI) label

 

Be sure to use the correct power supply for your chassis product SKU (see Table 7).

CAUTION:

Do not mix:

  • AC and DC power supplies in the same chassis.

  • Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

  • Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the same chassis.

CAUTION:

Verify that the airflow direction on the power supply handle matches the direction of airflow in the chassis. Ensure that each power supply 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 pattern on a chassis, you must replace all the fans and power supplies at one time to use the new direction.

Table 7 lists the DC power supplies used in EX4650 switches and the direction of airflow in them.

Table 7: Airflow direction in power supplies for EX4650 switches

Product Number

Direction of Airflow

Color of Power Supply Handle

JPSU-650W-DC-AFO

Front to back

Juniper Gold

JPSU-650W-DC-AFI

Back to front

Juniper Azure Blue

EX4650 DC Power Specifications

Table 8 describes the EX4650 DC power specifications. The typical and maximum power consumption values are calculated using dummy transceivers on all ports. Traffic is run at 25° C ambient temperature.

Table 8: DC Power Specifications for EX4650

Item

Specifications

DC input voltage

  • Rated operating voltage: –48 VDC to -60 VDC

  • Operating voltage range: -40.8 VDC through -72 VDC

DC input current rating

20 A maximum

Typical power consumption

260 W

Maximum power consumption

450 W

DC Power Supply LEDs in EX4650 Switches

Figure 11 shows the location of the LEDs on the DC power supply.

Figure 11: DC Power Supply Faceplate on an EX4650 SwitchDC Power Supply Faceplate on an EX4650 Switch
  1

Input LED

  3

Fault LED

  2

Output LED

 
CAUTION:

The V+ terminals are shunted internally together, as are the V- terminals. The same polarity terminal can be wired together from the same source to provide an additional current path in a higher power chassis. Do not connect the terminals to different sources.

Table 9 describes the LEDs on the DC power supplies.

Table 9: DC Power Supply LEDs on an EX4650 Switch

LED

Color

State

Description

In

Unlit

Off

The power supply is disconnected from power, or power is not coming into the power supply.

Green

On steadily

Power is coming into the power supply.

Out

Unlit

Off

The power supply is disconnected from power, or the power supply is not sending out power correctly.

Green

On steadily

The power supply is sending out power correctly.

Fault

Amber

On steadily

An error has occurred in the power supply. Replace the power supply as soon as possible. To maintain proper airflow through the chassis, leave the power supply installed in the chassis until you are ready to replace it.