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EX9204 Power System

AC Power Supply in an EX9204 Switch

An EX9204 switch is configurable with one, two, or four AC power supplies. The power supplies connect to the midplane, which distributes the different output voltages produced by the power supplies to the switch components, depending on their voltage requirements. Each power supply is cooled by its own internal cooling system.

CAUTION:

EX9204 switches use either AC or DC power supplies. Do not mix AC and DC power supplies in a switch. The first type of power supply detected by the switch when initially powered on determines the type of power supply allowed by the switch. All installed power supplies of the other type are disabled by the switch. If you install a power supply of the other type while the switch is operating, the switch disables the power supply and generates an alarm.

This topic describes the AC power supplies in EX9204 switches:

AC Power Supply Description

The AC power supplies in EX9204 switches are hot-insertable and hot-removable field-replaceable units (FRUs).

You can install up to four AC power supplies in an EX9204 switch. Power supplies are installed in the rear of the chassis in slots PEM0 through PEM3 (left to right).

Warning:

The switch is installed in a restricted-access location. It has a separate protective earthing terminal (sized for UNC 1/4-20 ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth.

CAUTION:

Before you begin installing the switch, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage the switch.

Each AC power supply weighs approximately 6.6 lb (2.99 kg) and consists of one AC appliance inlet, an AC input switch, a fan, and LEDs to monitor the status of the power supply. See Figure 1.

Figure 1: AC Power Supply for an EX9204 Switch AC Power Supply for an EX9204 Switch

Each power supply has its own fan and is cooled by its own internal cooling system.

EX9204 switches support 2520 W AC power supply. The AC power supply supports the low-line (100–120 VAC) and the high-line(200–240 VAC) AC power configurations.

Each AC power supply has a single AC appliance inlet located on the power supply that requires a dedicated AC power feed. We recommend that you use a customer site circuit breaker rated for 16.0 A @ 100 VAC or 16.0 A @ 200 VAC circuit breaker minimum for each AC power supply, or as required by local code. Doing so enables you to operate the switch in any configuration without upgrading the power infrastructure.

AC Power Supply Configurations

The EX9204 switch supports either the low-line (100–120 V) AC power configuration or the high-line (200–240 V) AC power configuration.

  • In the low-line (100–120 V) AC power configuration, the EX9204 switch contains either two AC power supplies in base AC configuration, located horizontally at the rear of the chassis in slots PEM0 and PEM1 (left to right); or four AC power supplies in the redundant AC configuration, located in slots PEM0 through PEM3 (left to right). Each AC power supply provides power to all components in the switch.

    The low-line configuration requires minimum two power supplies to provide the maximum configuration with full power for as long as the switch is operational. When only two power supplies are present, they share power almost equally within a fully populated system and removing one of the power supply will disturb switch functions. Four AC power supplies provide full power redundancy; if one power supply fails or is removed, the remaining power supplies assume the entire electrical load without interruption.

  • In the high-line (200–240 V) AC power configuration, the EX9204 switch contains either one power supply in the base AC configuration, located horizontally in the slot PEM0; or two power supplies in the redundant AC configuration, located in slots PEM0 and PEM2 (left to right). In a high-line AC power configuration, each AC power supply provides power to all components in the switch.

    In high-line configuration, one power supply provide the maximum configuration with full power for as long as the switch is operational. Two power supplies provide full power redundancy; if one power supply fails or is removed, the remaining power supply assume the entire electrical load without interruption. The high-line configuration requires one power supply, with the second providing redundancy. See AC Power Supply Specifications for EX9204 Switches.

Ensure that you install sufficient number of power supplies to provide the power necessary for the line cards you install in the switch. See Power Requirements for EX9200 Switch Components to know the power required by each component in the switch and AC Power Supply Specifications for EX9204 Switches for the power supply specifications including the output power provided by the power supplies.

Table 1 shows an example for power requirement calculation. To install three EX9200-32XS line cards in the switch, the power required is 2300 W, calculated as shown in the table:

Table 1: Example—Power Required to Install Three EX9200-32XS Line Cards in an EX9204 Switch

Component

Power Required

Base system

410 W

1 SF module

150 W

1 RE module

90 W

3 EX9200-32XS line cards

1650 W

Total

2300 W

The output power provided by each low-voltage line power supply is 1167 W and the output power provided by each high-voltage line power supply is 2050 W.

Starting in Junos OS Release 18.4R1, on EX9204 switches, the enhanced AC PEM in the high-line power configuration supplies a power output of 2400 W. On Junos OS versions prior to 18.4R1, the PEM provided 2050 W of power output.

Therefore, to provide sufficient power to support three EX9200-32XS line cards, you must install at least two low-voltage line or high-voltage line power supplies in the switch.

AC Power Supply Specifications for EX9204 Switches

Table 2 lists the power supply specifications for an AC power supply used in EX9204 switches.

Table 2: AC Power Supply Specifications for an EX9204 Switch

Item

Specifications

AC input voltage

Operating range:

  • 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: 16 A

  • High-voltage line: 15.1 A

AC output power

  • Low-voltage line: 1167 W

  • High-voltage line: 2050 W

Table 3 lists the AC power system specification for an EX9200 switch.

Table 3: AC Power System Specifications

Item

Low-Line

High-Line

Redundancy

2+2

1+1

Output power (maximum) per power supply

1167 W

2050 W

Output power (maximum) per system

2334 W

2050 W

AC Power Supply LEDs in an EX9204 Switch

An AC power supply has three LEDs on its faceplate. These LEDs display information about the status of the AC power supply. The power supply status is also reflected in two LEDs on the craft interface. In addition, a power supply failure triggers the major alarm LED on the craft interface.

Table 4 describes the LEDs on an AC power supply in an EX9204 switch.

Table 4: AC Power Supply LEDs on EX9204 Switches

LED

Color

Description

AC OK

Green

AC power input is within range. Power supply is functioning normally.

Yellow

AC power input is below the range.

Off

Indicates one of the following:

  • Power supply is disconnected from AC power feed.

  • No AC power input.

DC OK

Green

DC power output generated by the power supply is within the normal operating ranges.

Off

DC power output generated by the power supply is not within the normal operating ranges.

PS FAIL

Red

Power supply is not functioning normally and its output voltage is out of regulation limits. Check AC OK and DC OK LEDs for more information.

Off

Power supply is functioning normally.

AC Power Cord Specifications for an EX9204 Switch

Each AC power supply has a single AC appliance inlet located on the power supply that requires a dedicated AC power feed. Most sites distribute power through a main conduit that leads to frame-mounted power distribution panels, one of which can be located at the top of the rack that houses the switch. An AC power cord connects each power supply to the power distribution panel.

You can order detachable AC power cords, each approximately 8 ft (2.44 m) long that supply AC power to the switch. The C19 appliance coupler end of the cord inserts into the AC appliance inlet coupler, type C20 (right angle) as described by International Electrotechnical Commission (IEC) standard 60320. The plug end of the power cord fits into the power source receptacle that is standard for your geographical location.

Table 5 provides specifications and Figure 2 depicts the plug on the AC power cord provided for each country or region.

Table 5: AC Power Cord Specifications for an EX9204 Switch

Country

Model Number

Electrical Specification

Plug Type

Australia

CBL-M-PWR-RA-AU

240 VAC, 50 Hz AC

SAA/3/15

China

CBL-M-PWR-RA-CH

220 VAC, 50 Hz AC

CH2-16P

Europe (except Denmark, Italy, Switzerland, and United Kingdom)

CBL-M-PWR-RA-EU

220 or 230 VAC, 50 Hz AC

CEE 7/7

Italy

CBL-M-PWR-RA-IT

230 VAC, 50 Hz AC

CEI 23-16/VII

Japan

CBL-PWR-RA-JP15

125 VAC, 50 or 60 Hz AC

JIS 8303

CBL-M-PWR-RA-JP

220 VAC, 50 or 60 Hz AC

NEMA L6-20P

North America

CBL-PWR-RA-US15

125 VAC, 60 Hz AC

NEMA 5-15P

CBL-PWR-RA-TWLK-US15

125 VAC, 60 Hz AC

NEMA L5-15P

CBL-M-PWR-RA-US

250 VAC, 60 Hz AC

NEMA 6-20

CBL-M-PWR-RA-TWLK-US

250 VAC, 60 Hz AC

NEMA L6-20P

United Kingdom

CBL-M-PWR-RA-UK

240 VAC, 50 Hz AC

BS89/13

Figure 2: AC Plug TypesAC Plug Types
Warning:

The AC power cord for the switch is intended for use with the switch only and not for any other use.

Warning:

Translation from Japanese: The attached power cable is only for this product. Do not use the cable for another product.

Note:

In North America, AC power cords must not exceed 4.5 m (approximately 14.75 ft) 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). You can order AC power cords that are in compliance.

Warning:

The switch is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (sized for UNC 1/4-20 ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth.

CAUTION:

Power cords must not block access to switch components. We recommend that you route all AC power cord cables through the power cord tray provided with the switch.

DC Power Supply in an EX9204 Switch

An EX9204 switch comes with two DC power supplies. The power supplies connect to the midplane, which distributes the different output voltages produced by the power supplies to the switch components, depending on their voltage requirements. Each power supply is cooled by its own internal cooling system.

CAUTION:

EX9204 switches use either AC or DC power supplies. Do not mix AC and DC power supplies in a switch. The first type of power supply detected by the switch when initially powered on determines the type of power supply allowed by the switch. All installed power supplies of the other type are disabled by the switch. If you install a power supply of the other type while the switch is operating, the switch disables the power supply and generates an alarm.

This topic describes the DC power supplies in EX9204 switches:

DC Power Supply Description

The DC power supplies in EX9000 switches are hot-insertable and hot-removable field-replaceable units (FRUs).

You can install two DC power supplies in an EX9204 switch. Power supplies are installed in the rear of the chassis in slots PEM0 and PEM2 (left to right).

A DC power supply weighs approximately 6.2 lb (2.81 kg) and consists of one DC input (–48 VDC and return), one 70 A (–48 VDC) circuit breaker, a fan, and LEDs to monitor the status of the power supply. See Figure 3.

Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated circuit breaker. We recommend that you provision 60 A or 75 A per feed, depending on the selected DIP switch setting. If you plan to operate a maximally configured DC-powered switch with DC power supplies, we recommend that you use a dedicated customer site circuit breaker rated for 70 A (–48 VDC) minimum, or as required by local code.

If you plan to operate a DC-powered switch at less than the maximum configuration, we recommend that you provision a circuit breaker according to respective National Electrical Code and customer site internal standards to maintain proper level of protection for the current specified above or each DC power supply rated for at least 125% of the continuous current that the system draws at –48 VDC.

Figure 3: DC Power Supply for an EX9204 SwitchDC Power Supply for an EX9204 Switch

DC Power Supply Configurations

In the DC power configuration, the EX9204 switch comes with two DC power supplies located at the rear of the chassis in slots PEM0 and PEM2 (left to right). One power supply provide the maximum configuration with full power for as long as the switch is operational. Two power supplies provide full redundancy; if one power supply fails or is removed, the redundant power supply takes over without interruption. . A single DC power supply provides power to all components and the second DC power supply provides redundancy. See DC Power Supply Specifications for EX9204 Switches.

Note:

Move the input switch to 0 for 60 A input and position 1 for 70 A input.

Note:

Do not set the input mode switch if the power supply is installed in the chassis. If the power supply is already installed, you must remove it before setting the input mode switch.

Ensure that you install sufficient number of power supplies to provide the power necessary for the line cards you install in the switch. See Power Requirements for EX9200 Switch Components to know the power required by each component in the switch and DC Power Supply Specifications for EX9204 Switches for the power supply specifications including the output power provided by the power supplies.

Table 6 shows an example for power requirement calculation. To install three EX9200-32XS line cards in the switch, the power required is 2300 W, calculated as shown in the table:

Table 6: Example—Power Required to Install Three EX9200-32XS Line Cards in an EX9204 Switch

Component

Power Required

Base system

410 W

1 SF module

150 W

1 RE module

90 W

3 EX9200-32XS line cards

1650 W

Total

2300 W

The output power provided by each power supply is at least 2400 W.

Therefore, one DC power supply can provide sufficient power to support three EX9200-32XS line cards.

DC Power Supply Specifications for EX9204 Switches

Table 7 lists the DC power supply specifications for EX9204 switches.

Table 7: DC Power Supply Specifications for an EX9204 Switch

Item

Specifications

DC input voltage

Operating range:

  • Minimum operating range: –40.5 VDC

  • Nominal operating range: –48 VDC

  • Operating voltage range: –40.5 VDC to –72 VDC

Maximum Input Current

60 A (DIP=0)

70 A (DIP=1)

Maximum output power

2400 W

2600 W

DC input current rating

50 A @ –48 VDC normal operating voltage

54.2 A @ –48 VDC normal operating voltage

Table 8 lists the power system specifications for EX9200 switches.

Table 8: Power System Specifications for an EX9200 Switch

Item

Specifications

Redundancy

1+1

Output power (maximum) per supply

60 A (DIP=0)

70 A (DIP=1)

2400 W

2600 W

Output power (maximum) per system

2400 W

2600 W

DC Power Supply LEDs in an EX9204 Switch

A DC power supply has three LEDs on its faceplate: POWER OK, BRKR ON, and INPUT OK LEDs. The power supply status is also reflected in two LEDs on the craft interface. In addition, a power supply failure triggers the major alarm LED on the craft interface.

Note:

A host subsystem must be present for the POWER OK LED to be on.

Table 9 describes the LEDs on a DC power supply in EX9204 switches.

Table 9: DC Power Supply LEDs in EX9204 Switches

LED

Color

Description

POWER OK

Green

Power supply is functioning normally.

Yellow

The main output voltage is out of range.

Off

Power supply is not functioning normally. Check the INPUT OK LED for more information.

BRKR ON

Green

DC power input is present and the DC power supply circuit breaker is turned on.

Off

DC power supply circuit breaker is turned off.

INPUT OK

Green

DC input is present and is connected in correct polarity.

Yellow

DC input is present, but is not in valid operating range or connected in reverse polarity.

Off

DC input to the power supply is not present.

Power Requirements for EX9200 Switch Components

Table 10 lists the power requirements for different hardware components of EX9200 switches.

Table 10: EX9200 Switch Component Power Requirements

Component

Typical Power (watt)

Reserved Power (watt)

Base system

  • EX9204 switch: 410 W

  • EX9208 switch: 560 W

  • EX9214 switch: 1290 W

  • EX9204 switch: 410 W

  • EX9208 switch: 560 W

  • EX9214 switch: 1670 W

Redundant system

  • EX9204 switch: 690 W

  • EX9208 switch: 800 W

  • EX9214 switch: 1530 W

  • EX9204 switch: 690 W

  • EX9208 switch: 800 W

  • EX9214 switch: 1910 W

EX9200-SF Switch Fabric module

150 W

150 W

EX9200-SF2 Switch Fabric module

155 W

155 W

EX9200-SF3 Switch Fabric module

See EX9200-SF3 Module in an EX9200 Switch

Routing Engine module (RE module)

90 W

90 W

EX9200-2C-8XS line card

530 W

610 W

EX9200-4QS line card

408 W

520 W

EX9200-6QS line card

511 W

607 W

EX9200-MPC line card

461 W

534 W

EX9200-10XS-MIC

29.8 W

29.8 W

EX9200-20F-MIC

37 W

37 W

EX9200-40T-MIC

41 W

41 W

EX9200-12QS line card

465 W

545 W

EX9200-15C line card

See EX9200-15C Line Card

EX9200-32XS line card

550 W

610 W

EX9200-40T line card

206 W

239 W

EX9200-40F line card

219 W

239 W

EX9200-40F-M line card

219 W

239 W

EX9200-40XS line card

465 W

545 W