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
AC Power Supply Airflow
N+0 Redundancy Configuration of AC Power Supplies
N+N Redundancy Configuration of AC Power Supplies

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

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	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+
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	Total Power (in watts) PSU₀(W) + PSU₁(W)	Usable System Power (in watts)	Backup Power (in watts)	Base Power (in watts)
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	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+
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	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++
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	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+
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	Total Power (in watts)	Usable System Power (in watts)	Backup Power (in watts)	Base Power (in watts)
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	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+
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	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++
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 support 350 W, 715 W, and 1100 W AC power supplies.

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

Table 11: 350 W AC power supply specifications
Table 12: 715 W AC power supply specifications
Table 13: 1100 W AC power supply specifications

Table 11: 350 W AC Power Supply Specifications for an EX4300 Switch
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: 715 W AC Power Supply Specifications for an EX4300 Switch
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: 11 A High-voltage line: 5 A
Output power	715 W

Table 13: 1100 W AC Power Supply Specifications for an EX4300 Switch
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

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 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 14—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 15—Specifications of power cords used to connect EX4300 switches to C13 power
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 14: 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 15: Specifications of Power Cords Used to Connect EX4300 Switches to C13 Power Strips
Country/Region	Electrical Specifications	Juniper Model Number
Europe	250 VAC, 10 A, 50 Hz	CBL-PWR-C15-C14-EU
North America	125 VAC, 15 A, 60 Hz	CBL-PWR-C15-C14-US

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

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.
IN OK	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
DC Power Supply Airflow
N+0 Redundancy Configuration of DC Power Supplies
N+N Redundancy Configuration of DC Power Supplies

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

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		14.2 A
Operating range		–40.8 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 –40.8 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 an AC 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
24-port EX4300 switch	2	1100	1045	550	150
32-port EX4300 switch	1	550	550	0	149
32-port EX4300 switch	2	1100	550	550	160
48-port EX4300 switch	1	550	550	0	175
48-port EX4300 switch	2	1100	1045	550	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
24-port EX4300 switch	2	1100	550	550	150
32-port EX4300 switch	1	550	550	0	149
32-port EX4300 switch	2	1100	550	550	160
48-port EX4300 switch	1	550	550	0	175
48-port EX4300 switch	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.

Table 22: DC Power Supply Specifications for an EX4300 Switch
Item	Specifications
DC input voltage	Nominal operating voltage: –48 VDC Operating voltage range: –40.8 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

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.
IN OK	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.

ON THIS PAGE

AC Power Supply in EX4300 Switches

Characteristics of an AC Power Supply

AC Power Supply Airflow

N+0 Redundancy Configuration of AC Power Supplies

N+N Redundancy Configuration of AC Power Supplies

AC Power Supply Specifications for EX4300 Switches

See Also

AC Power Cord Specifications for an EX4300 Switch

See Also

AC Power Supply LEDs in EX4300 Switches

DC Power Supply in EX4300 Switches

Characteristics of a DC Power Supply

DC Power Supply Airflow

N+0 Redundancy Configuration of DC Power Supplies

N+N Redundancy Configuration of DC Power Supplies

See Also

DC Power Supply Specifications for EX4300 Switches

See Also

DC Power Supply LEDs in EX4300 Switches