EX4300 Power System

 

AC Power Supply in EX4300 Switches

The AC power supply in EX4300 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 EX4300 switches that are powered by AC power supplies, except EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, EX4300-48P-S, and EX4300-48MP-S switches are shipped with one AC power supply installed in the rear panel of the switches. EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, EX4300-48P-S, and EX4300-48MP-S switches are not shipped with power supplies; you must order the power supplies separately.

Note

EX4300 switches except EX4300-48MP and EX4300-48MP-S switches support 350 W, 715 W, and 1100 W AC power supplies. EX4300-48MP and EX4300-48MP-S switches support 715 W, 1100 W, and 1400 W AC power supplies.

This topic describes the AC power supplies.

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.

Characteristics of an AC Power Supply

The AC power supplies for EX4300 switches are available in 350 W, 715 W, 1100 W, and 1400 W models. Figure 1 shows an AC power supply for EX4300 switches. The AC power supplies support Power over Ethernet (PoE+) in EX4300-24P, EX4300-24P-S, EX4300-48P, EX4300-48P-S, EX4300-48MP, and EX4300-48MP-S models.

Figure 1: AC Power Supply for EX4300 Switches
AC Power Supply for
EX4300 Switches

Table 1 lists the details of the 350 W, 715 W, 1100 W, and 1400 W AC power supplies used in EX4300 switches.

Table 1: Details of the AC Power Supplies in EX4300 Switches

Details

350 W AC Power Supply

715 W AC Power Supply

1100 W AC Power Supply

1400 W AC Power Supply

Model number

  • JPSU-350-AC-AFO-A

  • JPSU-350-AC-AFI-A

JPSU-715-AC-AFO-A

JPSU-1100-AC-AFO-A

JPSU-1400W-AC-AFO

Field-replaceable unit (FRU) type

Hot-insertable and hot-removable

Hot-insertable and hot-removable

Hot-insertable and hot-removable

Hot-insertable and hot-removable

Power supply weight

2.43 lb (1.1 kg)

2.43 lb (1.1 kg)

2.43 lb (1.1 kg)

3.06 lb (1.39 kg)

Minimum installed in chassis

1

1

1

1

Maximum installed in chassis

2

2

2

2

Power supply slots

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

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

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

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

AC appliance Inlet

Note: Each AC appliance inlet requires a dedicated AC power feed.

Number

1

1

1

1

Type

IEC-320-C13

IEC-320-C13

IEC-320-C15

IEC-320-C15

Rating

2 A

Note: EX4300-48MP and EX4300-48MP-S switches do not support this power supply.

  • EX4300 switches except EX4300-48MP and EX4300-48MP-S switches—11–5 A

  • EX4300-48MP and EX4300-48MP-S switches—10 A

  • EX4300 switches except EX4300-48MP and EX4300-48MP-S switches—12–6 A

  • EX4300-48MP and EX4300-48MP-S switches—15 A

12–8 A

Fans

Internal

Internal

Internal

Internal

Airflow

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

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

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

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

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

AC power cord retainer

1

1

1

1

Power supply status LEDs

IN OK and OUT OK

IN OK and OUT OK

IN OK and OUT OK

IN OK and OUT OK

Operating range

  • Low line: 100–120 VAC

  • High line: 200–240 VAC

  • Low line: 100–120 VAC

  • High line: 200–240 VAC

  • Low line: 115–120 VAC

  • High line: 200–240 VAC

  • Low line: 100–140 VAC

  • High line: 200–240 VAC

Note

In EU countries, Egypt, Nigeria, Saudi Arabia, Serbia, South Korea, and South Africa, you must ensure that the redundant power supply is installed in the switch chassis.

To prevent electrical injury while installing or removing AC power supplies, carefully follow instructions in Installing an AC Power Supply in an EX4300 Switch and Removing an AC Power Supply from an EX4300 Switch.

AC 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 2 lists the AC power supply models and the direction of airflow in them.

Table 2: Airflow Direction in AC Power Supply Models for EX4300 Switches

Model

Label on Power Supply

Direction of Airflow

JPSU-350-AC-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-350-AC-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.

JPSU-715-AC-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-1100-AC-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-1400W-AC-AFO

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.

N+0 Redundancy Configuration of AC Power Supplies

In an N+0 redundancy configuration, lower priority PoE ports may be impacted if a power supply fails.

Table 3 lists the N+0 power calculation for 24-port EX4300 switches that use 350 W, 715 W, and 1100 W power supplies.

Table 3: N+0 AC Power Calculations for 24-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

PSU0(W) + PSU1(W)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

Available PoE Power (in watts)

Ports Enabled for PoE+

PSU0

PSU1

350 W AC

350

350

0

150

200

6

350 W AC

350 W AC

700

665

0

150

515

17

350 W AC

715 W AC

1065

993.5

0

150

720

24

715 W AC

715

715

0

150

565

18

715 W AC

715 W AC

1430

1358.5

0

150

720

24

715 W AC

1100 W AC

1815

1705

0

150

720

24

1100 W AC

1100

1100

0

150

720

24

1100 W AC

1100 W AC

2200

2090

0

150

720

24

1100 W AC

350 W AC

1450

1340

0

150

720

24

Table 4 lists the N+0 power calculation for 32-port EX4300 switches that use the 350 W power supply.

Note

32-port EX4300 switches does not support Power over Ethernet (PoE).

Table 4: N+0 AC Power Calculations for 32-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

PSU0(W) + PSU1(W)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

PSU0

PSU1

350 W AC

350

350

0

164

350 W AC

350 W AC

700

665

0

164

Table 5 lists the N+0 power calculation for 48-port EX4300 switches except EX4300-48MP and EX4300-48MP-S switches that use 350 W, 715 W, and 1100 W power supplies.

Table 5: N+0 AC Power Calculations for 48-Port EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches

Power Supply Rating

Total Power (in watts)

PSU0(W) + PSU1(W)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

Available PoE Power (in watts)

Ports Enabled for PoE+

PSU0

PSU1

350 W AC

350

350

0

175

175

5

350 W AC

350 W AC

700

665

0

175

490

16

350 W AC

715 W AC

1065

993.5

0

175

818

27

715 W AC

715

715

0

175

540

18

715 W AC

715 W AC

1430

1358.5

0

175

1183

39

715 W AC

1100 W AC

1815

1705

0

175

1440

48

1100 W AC

1100

1100

0

175

925

30

1100 W AC

1100 W AC

2200

2090

0

175

1440

48

1100 W AC

350 W AC

1450

1340

0

175

1165

38

Table 6 lists the N+0 power calculation for EX4300-48MP and EX4300-48MP-S switches that use 715 W, 1100 W, and 1400 W power supplies.

Note

When operating at low line configuration, the 1400 W power supply operates as 1100 W power supply.

Table 6: N+0 AC Power Calculations for EX4300-48MP and EX4300-48MP-S Switches

Power Supply Rating

Total Power (in watts)

PSU0(W) + PSU1(W)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

Available PoE Power (in watts)

Ports Enabled for PoE+

Ports Enabled for PoE++

PSU0

PSU1

715 W AC

715

679

0

300

379

12

3

715 W AC

715 W AC

1430

1358

0

300

1058

35

11

715 W AC

1100 W AC

1815

1615

0

300

1315

43

13

715 W AC

1400 W AC

2115

1615

0

300

1315

43

13

1100 W AC

1100

1045

0

300

745

24

7

1100 W AC

1100 W AC

2200

1670

0

300

1370

45

14

1100 W AC

1400 W AC

2500

1670

0

300

1370

45

14

1400 W AC

1400 W AC

1330

0

300

1030

34

10

1400 W AC

1400 W AC

2800

2000

0

300

1700

48

17

N+N Redundancy Configuration of AC Power Supplies

You can configure your switch for N+N redundancy, in which N power supplies can be removed or fail and the remaining N power supplies continue to supply power to the switch without interruption.

Table 7 lists the N+N power calculation for 24-port EX4300 switches that use 350 W, 715 W, and 1100 W power supplies.

Table 7: N+N AC Power Calculations for 24-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

Available PoE Power (in watts)

Ports enabled for PoE+

PSU0

PSU1

350 W AC

350

350

0

150

200

6

350 W AC

350 W AC

700

350

350

150

200

6

350 W AC

715 W AC

1065

350

350

150

200

6

715 W AC

715

715

0

150

565

18

715 W AC

715 W AC

1430

715

715

150

565

18

715 W AC

1100 W AC

1815

715

715

150

565

18

1100 W AC

1100

1100

0

150

720

24

1100 W AC

1100 W AC

2200

1100

1100

150

720

24

1100 W AC

350 W AC

1450

350

350

150

200

6

Table 8 lists the N+N power calculation for 32-port EX4300 switches that use 350 W power supplies.

Note

32-port EX4300 switches does not support Power over Ethernet (PoE).

Table 8: N+N AC Power Calculations for 32-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

PSU0

PSU1

350 W AC

350

350

0

177

350 W AC

350 W AC

700

350

350

177

Table 9 lists the N+N power calculation for 48-port EX4300 switches except EX4300-48MP and EX4300-48MP-S switches that use 350 W, 715 W, and 1100 W power supplies.

Table 9: N+N AC Power Calculations for 48-Port EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches

Power Supply Rating

Total Power (in watts)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

Available PoE Power (in watts)

Ports enabled for PoE+

PSU0

PSU1

350 W AC

350

350

0

175

175

5

350 W AC

350 W AC

700

350

350

175

175

5

350 W AC

715 W AC

1065

350

350

175

175

5

715 W AC

715

715

0

175

540

18

715 W AC

715 W AC

1430

715

715

175

540

18

715 W AC

1100 W AC

1815

715

715

175

540

18

1100 W AC

1100

1100

0

175

925

30

1100 W AC

1100 W AC

2200

1100

1100

175

925

30

1100 W AC

350 W AC

1450

350

350

175

175

5

Table 10 lists the N+N power calculation for EX4300-48MP and EX4300-48MP-S switches that use 715 W, 1100 W, and 1400 W power supplies.

Note

When operating at low line configuration, the 1400 W power supply operates as 1100 W power supply.

Table 10: N+N AC Power Calculations for EX4300-48MP and EX4300-48MP-S Switches

Power Supply Rating

Total Power (in watts)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

Available PoE Power (in watts)

Ports enabled for PoE+

Ports enabled for PoE++

PSU0

PSU1

715 W AC

715

679

0

300

379

12

3

715 W AC

715 W AC

1430

679

679

300

379

12

3

715 W AC

1100 W AC

1815

679

679

300

379

12

3

715 W AC

1400 W AC

2115

679

679

300

379

12

3

1100 W AC

1100

1045

0

300

745

24

7

1100 W AC

1100 W AC

2200

1045

1045

300

745

24

7

1100 W AC

1400 W AC

2500

1045

1045

300

745

24

7

1400 W AC

1400

1330

0

300

1030

34

10

1400 W AC

1400 W AC

2800

1330

1330

300

1030

34

10

AC Power Supply Specifications for EX4300 Switches

EX4300 switches except EX4300-48MP and EX4300-48MP-S switches support 350 W, 715 W, and 1100 W AC power supplies. EX4300-48MP and EX4300-48MP-S switches support 715 W, 1100 W, and 1400 W AC power supplies.

The tables in this topic provides power supply specification of AC power supplies used in an EX4300 switch:

  • Table 11: power supply specifications of 350 W AC power supplies for EX4300 switches except EX4300-48MP and EX4300-48MP-S switches

  • Table 12: AC power supply specifications of 715 W AC power supplies for EX4300 switches

  • Table 13: power supply specifications of 1100 W AC power supplies for EX4300 switches

  • Table 14: power supply specifications of 1400 W AC power supplies for EX4300 switches

Table 11: Power Supply Specifications of 350 W AC Power Supplies for EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches

Item

Specification

AC input voltage

  • Low-voltage line: 100–120 VAC

  • High-voltage line: 200–240 VAC

AC input line frequency

50–60 Hz

AC input current rating

  • Low-voltage line: 4 A

  • High-voltage line: 2 A

Output power

350 W

Note

The 32-port EX4300 switches support only 350 W AC power supplies with front-to-back airflow direction.

Table 12: Power Supply Specifications of 715 W AC Power Supplies for EX4300 Switches

Item

Specification

AC input voltage

  • Low-voltage line: 100–120 VAC

  • High-voltage line: 200–240 VAC

AC input line frequency

50–60 Hz

AC input current rating

EX4300 switches except EX4300-48MP and EX4300-48MP-S models

  • Low-voltage line: 11 A

  • High-voltage line: 5 A

EX4300-48MP and EX4300-48MP-S switches

  • Low-voltage line: 8.5 A

  • High-voltage line: 3.5 A

Output power

715 W

Table 13: Power Supply Specifications of 1100 W AC Power Supplies for EX4300 Switches

Item

Specification

AC input voltage

  • Low-voltage line: 115–120 VAC

  • High-voltage line: 200–240 VAC

AC input line frequency

50–60 Hz

AC input current rating

  • Low-voltage line: 12 A

  • High-voltage line: 6 A

Output power

1100 W

Table 14: Power Supply Specifications of 1400 W AC Power Supplies for EX4300-48MP and EX4300-48MP-S Switches

Item

Specification

AC input voltage

  • Low-voltage line: 100–140 VAC

  • High-voltage line: 200–240 VAC

AC input line frequency

50–60 Hz

AC input current rating

  • Low-voltage line: 12 A

  • High-voltage line: 8 A

Output power

1400 W

AC Power Cord Specifications for an EX4300 Switch

Each AC power supply has a single AC appliance inlet that requires a dedicated AC power feed. A detachable AC power cord is supplied with each AC power supply. The 350 W AC and the 715 W AC power supplies are shipped with AC power cords with the C13 coupler type and the 1100 W AC power supplies and 1400 W AC power supplies are shipped with AC power cord with the C15 coupler type as described by International Electrotechnical Commission (IEC) standard 60320. The plug at the male end of the power cord fits into the power source outlet that is standard for your geographical location.

Note

In North America, AC power cords must not exceed 14.75 ft (4.5 m) in length, to comply with National Electrical Code (NEC) Section 400-8 (NFPA 75, 5-2.2) and Canadian Electrical Code (CEC) Section 4-010(3).

The tables in this topic list the AC power cords specifications provided for different power supplies for each country or region.

  • Table 15—Power cords for 350 W AC for EX4300 switches except EX4300-48MP and EX4300-48MP-S switches and 715 W AC power supplies for EX4300 switches

  • Table 16—Power cords for 1100 W AC power supplies for EX4300 switches and 1400 W AC power supplies for EX4300-48MP and EX4300-48MP-S Switches

Table 15: AC Power Cord Specifications for 350 W Power Supplies for EX4300 Switches Except EX4300-48MP and EX4300-48MP-S Switches and 715 W AC Power Supplies for EX4300 Switches

Country/

Region

Electrical Specifications

Plug Standards

Juniper Model Number

Graphic

Argentina

250 VAC, 10 A, 50 Hz

IRAM 2073 Type RA/3

CBL-EX-PWR-C13-AR

No graphic available

Australia

250 VAC, 10 A, 50 Hz

AS/NZS 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

No graphic available

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

No graphic available

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/3

CBL-EX-PWR-C13-SA

Switzerland

250 VAC, 10 A, 50 Hz

SEV 6534-2 Type 12G

CBL-EX-PWR-C13-SZ

No graphic available

Taiwan

125 VAC, 10 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

Table 16: AC Power Cord Specifications for 1100 W AC Power Supplies for EX4300 Switches and 1400 W AC Power Supplies for EX4300-48MP and EX4300-48MP-S Switches

Country/Region

Electrical Specifications

Plug Standards

Juniper Model Number

Argentina

250 VAC, 10 A, 50 Hz

IRAM 2073 Type RA/3

CBL-PWR-C15M-HITEMP-AR

Australia

250 VAC, 10 A, 50 Hz

AS/NZZS 3112-2000 Type SAA/3

CBL-PWR-C15M-HITEMP-AU

Brazil

250 VAC, 10 A, 50 Hz

NBR 14136 Type BR/3

CBL-PWR-C15M-HITEMP-BR

China

250 VAC, 10 A, 50 Hz

GB2099, GB1002 Type PRC/3

CBL-PWR-C15M-HITEMP-CH

Europe (except Italy, Switzerland, and United Kingdom)

250 VAC, 10 A, 50 Hz

CEE (7) VII Type VIIG

CBL-PWR-C15M-HITEMP-EU

Israel

250 VAC, 10 A, 50 Hz

SI 32 Type IL/3G

CBL-PWR-C15M-HITEMP-IL

India

250 VAC, 10 A, 50 Hz

SABS 164/1:1992 Type ZA/3

CBL-PWR-C15M-HITEMP-IN

Italy

250 VAC, 10 A, 50 Hz

CEI 23-16 Type I/3G

CBL-PWR-C15M-HITEMP-IT

Japan

125 VAC, 15 A, 50 Hz or 60 Hz

JIS 8303 Type 498GJ

CBL-PWR-C15M-HITEMP-JP

Korea

250 VAC, 10 A, 50 Hz

CEE (7) VII Type VIIG

CBL-PWR-C15M-HITEMP-KR

South Africa

250 VAC, 10 A, 50 Hz

SABS 164/1:1992 Type ZA/3

CBL-PWR-C15M-HITEMP-SA

North America

125 VAC, 15 A, 60 Hz

NEMA 5-15 Type N5/15

CBL-PWR-C15M-HITEMP-US

Switzerland

250 VAC, 10 A, 50 Hz

SEV 1011 / 6534-2 Type 12G

CBL-PWR-C15M-HITEMP-SZ

United Kingdom

250 VAC, 10 A, 50 Hz

BS 1363/A Type BS89/13

CBL-PWR-C15M-HITEMP-UK

Caution

The AC power cord for the EX4300 switch is intended for use with this switch only. Do not use the cord with any other product.

Caution

Power cords must not block access to switch components.

AC Power Supply LEDs in EX4300 Switches

Figure 2 shows the location of the LEDs on an AC power supply for EX4300 switches except EX4300-48MP and EX4300-48MP-S switches.

Figure 2: LEDs on AC Power Supply for EX4300 Switches
LEDs on AC Power
Supply for EX4300 Switches
  1
IN OK LED
  2
OUT OK LED

Table 17 describes the AC power supply LEDs.

Table 17: AC Power Supply LEDs in EX4300 Switches

LED

Color

Description

IN OK

Unlit

Indicates one of the following:

  • AC power input voltage is not within normal operating range.

  • No AC power input.

Green

Power supply is receiving proper input power and is functioning normally.

OUT OK

Unlit

Indicates one of the following:

  • IN OK LED is unlit.

  • The power supply is not delivering power correctly.

Green

The power supply is delivering power and is functioning correctly.

Red

The power supply has failed and must be replaced.

Note

If the IN OK LED and the OUT 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 IN OK LED is lit green and the OUT 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 EX4300 Switches

The DC power supply in EX4300 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.

Note

EX4300-24T, EX4300-24P, EX4300-32F, EX4300-48T, EX4300-48T-AFI, EX4300-48P, EX4300-48MP, and EX4300-48MP-S models do not support DC power. EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-32F-DC, EX4300-48T-S, EX4300-48T-DC, EX4300-48T-DC-AFI, and EX4300-48P-S models support DC power.

All the EX4300 switches that are powered by DC power supplies except EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, and EX4300-48P-S switches are shipped with one DC power supply installed in the rear panel of the switches. EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, and EX4300-48P-S switches are not shipped with power supplies; you must order the power supplies separately.

This topic describes the DC power supplies.

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.

Characteristics of a DC Power Supply

EX4300 switches support 550 W DC power supply (see Figure 3).

Figure 3: DC Power Supply for an EX4300 Switch
DC Power Supply for
an EX4300 Switch

You can install up to two DC power supplies in an EX4300 switch. Power supplies are installed in the power supply slots labeled PSU 0 and PSU 1 in the rear panel of the chassis.

Table 18 lists the details of the 550 W DC power supplies used in EX4300 switches.

Table 18: Details of the DC Power Supplies in EX4300 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

IN OK and OUT 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.

To prevent electrical injury while installing or removing DC power supplies, carefully follow instructions in Installing a DC Power Supply in an EX4300 Switch and Removing a DC Power Supply from an EX4300 Switch.

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

Table 19: Airflow Direction in DC Power Supply Models for EX4300 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.

N+0 Redundancy Configuration of DC Power Supplies

In an N+0 redundancy configuration, no power is reserved for resiliency regardless of number of power supplies installed in the switch.

Depending on the power supplies installed in the switch, you can determine the system power budget.

  • If one power supply is installed in the switch:

    System power budget = Output wattage of the installed power supply (PSU(W))

  • If two power supplies are installed in the switch:

    System power budget = (Sum of the output wattage of the two power supplies) – (10% of the output wattage of the installed power supply)

    System power budget = PSU0(W) + PSU1(W) – (0.10 x (PSU(W))

Table 20 lists the N+0 power calculation for EX4300 switches that use 550 W DC power supplies.

Note

The DC power supply in the switch does not support Power over Ethernet (PoE); you can use either an external power injector or an AC power supply to supply power to PoE devices that you connect to the switch. 32-port EX4300 switches does not support Power over Ethernet (PoE).

Table 20: N+0 DC Power Calculations for EX4300 Switch Configurations

Switch Configuration

Number of Power Supplies

Total Power (in watts)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

24-port EX4300 switch

1

550

550

0

150

2

1100

1045

0

150

32-port EX4300 switch

1

550

550

0

149

2

1100

550

550

160

48-port EX4300 switch

1

550

550

0

175

2

1100

1045

0

175

N+N Redundancy Configuration of DC Power Supplies

You can configure your switch for N+N redundancy, in which N power supplies can be removed or fail and the remaining N power supplies continue to supply power for the switch without interruption.

You can configure the power management software to manage switch power for N+N redundancy. When you configure power management for N+N redundancy, half of the total power available (N) is held as reserve power while the other half (N) is available for immediate consumption. If the switch configuration changes and requires additional power, then additional power is drawn from the reserve power, and the switch no longer has N+N power supply redundancy. This condition raises a minor alarm. If the condition is not corrected within 5 minutes, then a major alarm is issued.

For more information about how power management allocates power to chassis components when power is insufficient, see Understanding Power Management on EX Series Switches.

Depending on the power supplies installed in the switch, you can determine the system power budget.

  • If one power supply is installed in the switch:

    • System power budget = Output wattage of the installed power supply (PSU(W))

    • Backup power available = 0 W

    A minor alarm is raised as switch has no N+N power supply redundancy.

  • If two power supplies are installed in the switch:

    • System power budget = (Output wattage of one power supply) – (5% of the output wattage of one power supply)

      System power budget = PSU(W) – (0.05 x PSU(W))

    • Backup power available = (Output wattage of one power supply) – (5% of the output wattage of one power supply)

      System power budget = PSU(W) – (0.05 x PSU(W))

Table 21 lists the N+N power calculation for EX4300 switches that use 550 W DC power supplies.

Note

The DC power supply in the switch does not support Power over Ethernet (PoE); you can use either an external power injector or an AC power supply to supply power to PoE devices that you connect to the switch. 32-port EX4300 switches does not support Power over Ethernet (PoE).

Table 21: N+N DC Power Calculations for EX4300 Switch Configurations

Switch Configuration

Number of Power Supplies

Total Power (in watts)

Usable System Power (in watts)

Backup Power (in watts)

Base Power (in watts)

24-port EX4300 switch

1

550

550

0

150

2

1100

550

550

150

32-port EX4300 switch

1

550

550

0

149

2

1100

550

550

160

48-port EX4300 switch

1

550

550

0

175

2

1100

550

550

175

DC Power Supply Specifications for EX4300 Switches

Table 22 lists the power supply specifications for a DC power supply used in an EX4300 switch.

Note

EX4300-24T, EX4300-24P, EX4300-32F, EX4300-48T, EX4300-48T-AFI, EX4300-48P, EX4300-48MP, and EX4300-48MP-S models do not support DC power. EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-32F-DC, EX4300-48T-S, EX4300-48T-DC, EX4300-48T-DC-AFI, and EX4300-48P-S models support DC power.

Table 22: Power Supply Specifications for DC Power Supplies for EX4300 Switches

Item

Specifications

DC input voltage

  • Nominal operating voltage: –48 VDC

  • Operating voltage range: –48 VDC through –60 VDC

DC input current rating

4 A maximum at nominal operating voltage (–48 VDC)

Output power

550 W

DC Power Supply LEDs in EX4300 Switches

Figure 4 shows the location of the LEDs on a DC power supply for an EX4300 switch.

Figure 4: DC Power Supply Faceplate on an EX4300 Switch
DC Power Supply
Faceplate on an EX4300 Switch
  1
IN OK LED
  2
OUT OK LED

Table 23 describes the LEDs on the DC power supplies.

Table 23: DC Power Supply LEDs on an EX4300 Switch

Name

Color

Description

IN OK

Unlit

Indicates one of the following:

  • Power supply is disconnected from DC power feed.

  • DC power input voltage is not within normal operating range.

  • No DC power input.

Green

The power supply is receiving power.

OUT OK

Unlit

Indicates one of the following:

  • IN OK LED is unlit.

  • The power supply is not delivering power correctly.

Green

The power supply is functioning correctly.

Red

The power supply has failed and must be replaced.