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EX4200 Power System

 

Power Supply in EX4200 Switches

The power supply in EX4200 switches is a hot-removable and hot-insertable field-replaceable unit (FRU) that you can install on the rear panel without powering off the switch or disrupting the switching function. EX4200 switches have an internal redundant power supply, making the power supply in EX4200 switches fully redundant.

All the EX4200 switch models, except the EX4200-24F-S and EX4200-48T-S switches are shipped with one power supply pre-installed in the rear panel of the switches. EX4200-24F-S and EX4200-48T-S switches are not shipped with pre-installed power supplies; you must order them separately.

Note

This topic uses the term PoE to refer to both PoE and PoE+ unless there is a need to distinguish between the two.

EX4200 switches use power supplies that provides two DC output voltages: 12 V for system and logic power and 48–51 V (or higher, to compensate for voltage drops along the path from the power supplies to the RJ-45 connector) for PoE ports.

Note

After powering on the switch, wait for at least 60 seconds before powering it off. After powering off the switch, wait for at least 60 seconds before powering it back on.

After the switch has been powered on, it can take up to 60 seconds for status indicators—such as LEDs on the power supply, show chassis command output, and messages on the LCD panel—to indicate that the power supply is functioning normally. Ignore error indicators that might appear during the first 60 seconds.

Note

EX4200-24PX and EX4200-48PX switches do not support the 930 W (EX-PWR-930-AC) or the 600 W (EX-PWR-600-AC) AC power supplies that are used in the EX4200-48P and the EX4200-24P switch models. EX4200-24PX and EX4200-48PX switches work only with the power supplies labeled EX-PWR2-930-AC or EX-PWR3-930-AC. All EX4200 switches support EX-PWR2-930-AC and EX-PWR3-930-AC power supplies. You can find the label on the top of the power supply (see Removing a Power Supply from an EX4200 Switch).

AC Power Supplies

All the EX4200 switches that are powered by AC power supplies except the EX4200-24F-S and EX4200-48T-S switches are shipped with one AC power supply pre-installed in the rear panel of the switches. EX4200-24F-S and EX4200-48T-S switches are not shipped with pre-installed power supplies; you must order them separately.

The AC power supply for the switch is available in 320 W, 600 W, and 930 W models (see Figure 1 and Figure 2). The exterior of the 600 W model is identical in appearance to that of the 930 W model. The 320 W power supply is flush with the chassis. The 600 W power supply and 930 W power supply extend out of the chassis by 2.25 in. The power cord retainer clips extend out of the power supply by 3 in. The number of ports on which PoE is enabled determines the minimum power requirements of different switch models.

Figure 1: 320 W AC Power Supply
320 W
AC Power Supply
Figure 2: 600 W and 930 W AC Power Supplies
600 W
and 930 W AC Power Supplies

To avoid electrical injury, follow instructions in Installing a Power Supply in an EX3200 Switch and Removing a Power Supply from an EX3200 Switch or Installing a Power Supply in an EX4200 Switch or Removing a Power Supply from an EX4200 Switch carefully.

DC Power Supplies

All the EX4200 switches that are powered by DC power supplies except the EX4200-24F-S and EX4200-48T-S switches are shipped with one DC power supply pre-installed in the rear panel of the switches. EX4200-24F-S and EX4200-48T-S switches are not shipped with pre-installed power supplies; you must order them separately.

The DC power supply for the switch is available in a 190 W model, with dual input feeds for power resiliency (see Figure 3).

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.

Note

The DC power supply in the switch has four terminals labeled A+, B+, A–, and B– (see Figure 3) for connecting DC power source cables labeled positive (+) and negative (–). The DC power supplies are shipped with jumpers from A+ input to B+ input tied together and jumpers from A– input to B– input tied together.

Note

The A+ and B+ terminals are referred to as +RTN and A– and B– terminals are referred to as –48 V in DC Power Wiring Sequence Warning and DC Power Electrical Safety Guidelines.

Figure 3: DC Power Supply
DC Power
Supply

To avoid electrical injury, follow instructions in Installing a Power Supply in an EX3200 Switch and Removing a Power Supply from an EX3200 Switch or Installing a Power Supply in an EX4200 Switch or Removing a Power Supply from an EX4200 Switch carefully.

PoE Power Budget and AC Power Supplies

The PoE power budget for a PoE switch model is determined by the capacity of its power supply. For EX4200 switches, the capacity of the power supply provided with a PoE model is sufficient to supply each PoE-capable port with up to 15.4 W in compliance with the IEEE 802.3af PoE standard. Table 1 lists the power supply ratings, and the associated PoE power budgets for EX4200 switch models that support PoE.

Starting with Junos OS Release 11.1, EX4200 switches support enhanced PoE, a Juniper Networks extension to the IEEE 802.3af PoE standard. Enhanced PoE permits up to 18.6 W per PoE port. Because the power supply provided with a switch is designed to supply a maximum of 15.4 W per PoE port, if you connect a powered device that draws more than 15.4 W, the PoE power budget might not be sufficient to supply a full 15.4 W to the remaining PoE ports.

Note

Switches upgraded to Junos OS Release 11.1 from a previous release require a separate upgrade of the PoE controller software to enable enhanced PoE support.

EX4200-24PX and EX4200-48PX switches support PoE+, the IEEE 802.3at PoE standard, and permit up to 30 W per port.

Table 1: Power Supply Rating and PoE Power Budget for EX4200 Switch Models

Switch Model Number

Number of PoE-enabled Ports

Power Supply Rating

PoE Power Budget

EX4200-24T

8

320 W

130 W

EX4200-48T

8

320 W

130 W

EX4200-48T-S

8

320 W

130 W

EX4200-24P

24

600 W

410 W

EX4200-48P

48

930 W

740 W

EX4200-24PX

24

930 W

740 W

EX4200-48PX

48

930 W

740 W

AC Power Supply LEDs in EX4200 Switches

Table 2 describes the LEDs on the AC power supplies.

Table 2: AC Power Supply LEDs

LED

State and Description

AC OK

  • Off—Disconnected from power or power is not coming into the power supply.

  • On—Power is coming into the power supply.

DC OK

  • Off—Power supply is not sending out power correctly.

  • On—Power supply is sending out power correctly.

Note

If the AC OK LED and the DC OK LED are unlit, either the AC power cord is not installed properly or the power supply fuse has failed. If the AC OK LED is lit and the DC OK LED is unlit, the AC power supply is not installed properly or the power supply has an internal failure.

DC Power Supply LEDs in EX4200 Switches

. Table 3 describes the LEDs on the DC power supplies.

Table 3: DC Power Supply LEDs

LED Label

Color

Description

LED A

Red

Inputs A and B are normal, but there is no output.

LED B

Red

LED A

Green

Inputs A and B are normal; output is normal.

LED B

Green

LED A

Flash Red

Input A has failed because the power supply fuse has failed, input voltage is low, or there is a loose connection; output is normal.

LED B

Green

LED A

Green

Input B has failed because the power supply fuse has failed, input voltage is low, or there is a loose connection; output is normal.

LED B

Flash Red

LED A

Flash Red

Both inputs have failed because the power supply fuse has failed, input voltage is low, or there is a loose connection; output is normal.

LED B

Flash Red

LED A

Off

There is no input; there is no output.

LED B

Off

Power Specifications for EX4200 Switches

This topic describes power specifications for power supplies for EX4200 switches.

Table 4 provides the AC power supply electrical specifications for EX4200 switches.

Table 5 provides the DC power supply electrical specifications for EX4200 switches.

Note

This topic uses the term PoE to refer to both PoE and PoE+ unless there is a need to distinguish between the two.

Table 4: AC Power Supply Electrical Specifications

Item

Specification

AC input voltage

100 through 240 VAC

AC input line frequency

50 through 60 Hz

AC system current rating

  • 4 A (for switches with 8 ports equipped for Power over Ethernet (PoE) or the switch with 24 100Base-FX/1000Base-SX SFP ports)

  • 7 A (for switches with 24 ports equipped for PoE)

  • 12 A (for switches with 48 ports equipped for PoE)

Table 5: DC Power Supply Electrical Specifications

Item

Specification

DC input voltage

36 through 72 VDC

DC input current

7 A maximum

Power supply output

190 W

Output holdup time

1 ms minimum

Note

The DC power supply in EX4200 switches 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.

Note

For DC power supplies, we recommend that you provide at least 7.5 A at 48 VDC and use a facility circuit breaker rated for 10 A minimum. Doing so enables you to operate the switch in any configuration without upgrading the power infrastructure, and ensures that the switch functions at full capacity using multiple power supplies.

AC Power Cord Specifications for EX4200 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 at the male 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 6 gives the AC power cord specifications for the countries and regions listed in the table.

Table 6: 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 4 illustrates the plug on the power cord for some of the countries or regions listed in Table 6.

Figure 4: AC Plug Types
AC Plug Types