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