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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, and EX4300-48P-S switches are shipped with one AC power supply pre-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 pre-installed power supplies; you must order them separately.

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.

This topic includes:

Characteristics of an AC Power Supply

The AC power supplies for EX4300 switches are available in 350 W, 715 W, and 1100 W models. Figure 21 shows an AC power supply for an EX4300 switch. The AC power supplies support Power over Ethernet (PoE+) in EX4300-24P, EX4300-24P-S, EX4300-48P, and EX4300-48P-S models.

Figure 21: AC Power Supply for an EX4300 Switch

AC Power Supply for
an EX4300 Switch

Table 20 lists the details of the 350 W, 715 W, and 1100 W AC power supplies used in EX4300 switches.

Table 20: 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

Model number

  • JPSU-350-AC-AFO-A
  • JPSU-350-AC-AFI-A

JPSU-715-AC-AFO-A

JPSU-1100-AC-AFO-A

Field-replaceable unit (FRU) type

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)

Minimum installed in chassis

1

1

1

Maximum installed in chassis

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.

AC appliance Inlet

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

Number

1

1

1

Type

IEC-320-C13

IEC-320-C13

IEC-320-C15

Rating

2 A

11–5 A

12–6 A

Fans

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)

AC power cord retainer

1

1

1

Power supply status LEDs

IN OK and OUT OK

IN OK and OUT OK

IN OK and OUT OK

Operating range

100–240 VAC

100–240 VAC

115–240 VAC

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

Table 21: 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.

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.

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 wattages of the two power supplies) – (10% of the output wattage of the power supply that has the higher output wattage)

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

Table 22 lists the N+0 power calculation for 24-port EX4300 switches that use 350 W AC, 715 W AC, and 1100 W AC power supplies.

Table 22: N+0 AC Power Calculations for 24-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

PSU0(W) + PSU1(W)

System Power Budget (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

843.5

24

715 W AC

715

715

0

150

565

18

715 W AC

715 W AC

1430

1358.5

0

150

1208.5

24

715 W AC

1100 W AC

1815

1705

0

150

1555

24

1100 W AC

1100

1100

0

150

950

24

1100 W AC

1100 W AC

2200

2090

0

150

1940

24

1100 W AC

350 W AC

1450

1340

0

150

1190

24

Table 23 lists the N+0 power calculation for 32-port EX4300 switches that use the 350 W AC power supply.

Table 23: N+0 AC Power Calculations for 32-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

PSU0(W) + PSU1(W)

System Power Budget (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 24 lists the N+0 power calculation for 48-port EX4300 switches that use 350 W AC, 715 W AC, and 1100 W AC power supplies.

Table 24: N+0 AC Power Calculations for 48-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

PSU0(W) + PSU1(W)

System Power Budget (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

818.5

27

715 W AC

715

715

0

175

540

18

715 W AC

715 W AC

1430

1358.5

0

175

1183.5

39

715 W AC

1100 W AC

1815

1705

0

175

1530

48

1100 W AC

1100

1100

0

175

925

30

1100 W AC

1100 W AC

2200

2090

0

175

1915

48

1100 W AC

350 W AC

1450

1340

0

175

1165

38

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.

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 the switch has no N+N power supply redundancy.

  • If two power supplies are installed in the switch:
    • System power budget = (Output wattage of the power supply that has the lower output wattage) – (5% of the output wattage of the power supply that has the lower output wattage)

      System power budget = MIN(PSU0(W), PSU1(W)) – (0.05 x MIN (PSU0(W), PSU1(W))

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

      Backup power available = MIN(PSU0(W), PSU1(W)) – (0.05 x MIN (PSU0(W), PSU1(W))

Table 25 lists the N+N power calculation for 24-port EX4300 switches that use 350 W, 715 W AC, and 1100 W AC power supplies.

Table 25: N+N AC Power Calculations for 24-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

System Power Budget (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

332.5

332.5

150

182.5

6

350 W AC

715 W AC

1065

332.5

332.5

150

182.5

6

715 W AC

715

715

0

150

565

18

715 W AC

715 W AC

1430

679.25

679.25

150

529.25

17

715 W AC

1100 W AC

1815

679.25

679.25

150

529.25

17

1100 W AC

1100

1100

0

150

950

24

1100 W AC

1100 W AC

2200

1045

1045

150

895

24

1100 W AC

350 W AC

1450

332.5

332.5

150

182.5

6

Table 26 lists the N+N power calculation for 32-port EX4300 switches that use 350 W AC power supplies.

Table 26: N+N AC Power Calculations for 32-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

System Power Budget (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

332.5

332.5

177

Table 27 lists the N+N power calculation for 48-port EX4300 switches that use 350 W, 715 W AC, and 1100 W AC power supplies.

Table 27: N+N AC Power Calculations for 48-Port EX4300 Switches

Power Supply Rating

Total Power (in watts)

System Power Budget (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

332.5

332.5

175

157.5

5

350 W AC

715 W AC

1065

332.5

332.5

175

157.5

5

715 W AC

715

715

0

175

540

18

715 W AC

715 W AC

1430

679.25

679.25

175

504.25

16

715 W AC

1100 W AC

1815

679.25

679.25

175

504.25

16

1100 W AC

1100

1100

0

175

925

30

1100 W AC

1100 W AC

2200

1045

1045

175

870

29

1100 W AC

350 W AC

1450

332.5

332.5

175

157.5

5

Related Documentation

Modified: 2015-06-23