EX4500 Power System

AC Power Supply in EX4500 Switches

The AC power supply in EX4500 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.

EX4500 switches ship with an AC power supply that gives an output of 1000 W at low-voltage line (100–120 VAC) and 1200 W at high-voltage line (200–240 VAC). You can install a second power supply in the switch too.

Power supplies are installed at the rear of the chassis in slots labeled 1 and 0. Both power supplies are accessible from the rear of the chassis.

Each AC power supply weighs approximately 3 lb (1.3 kg) and has an independent 12 A rated AC appliance inlet on its front. Each inlet requires a dedicated AC power feed. Each AC power supply has a fan, a bicolor LED on the faceplate that indicates the status of the power supply, and a colored ejector lever. See Figure 1.

Figure 1: AC Power Supply

Each AC power supply has an ejector lever that holds the power supply in place. The ejector lever locks into the corresponding hole in the chassis on the left side of the AC appliance inlet. For instructions for installing the power supply, see Installing an AC Power Supply in an EX4500 Switch.

Each AC power supply comes with a power cord retainer that holds the power cord in place. See Figure 2. The power cord retainer has a clip and an adjustment nut. The L-shaped ends of the retainer clip hook into the bracket holes on each side of the AC appliance inlet. The adjustment nut holds the power cord in the correct position. For instructions for installing the power cord retainer, see Installing an AC Power Supply in an EX4500 Switch.

Figure 2: Power Cord Retainer for an AC Power Supply

Each power supply has its own fan and is cooled by its own internal cooling system. The airflow for a power supply is either from the front of the power supply to the back or from the back of the power supply to the front depending on the switch model you purchase.

The color of the ejector lever on the power supply indicates the direction of airflow of the power supply.

• Green—Front-to-back airflow

• Orange—Back-to-front airflow

The color of the power supply's ejector lever must match the color of the intake or exhaust label visible through the vents of the installed fan tray. The color match indicates that the direction of airflow through the fan tray matches the direction of airflow through the power supply.

Each AC power supply provides power to all components in the switch. The two power supplies provide full power redundancy to the switch. If one power supply fails or is removed, the second power supply balances the electrical load without interruption. The switch reassesses the power required to support the switch configuration and issues error messages if the available power is insufficient.

AC Power Supply LEDs in EX4500 Switches

An AC power supply has one bicolor LED on its faceplate. This LED displays information about the status of the power supply. See Figure 3.

Figure 3: AC Power Supply LEDs in EX4500 Switches

Table 1 describes the LED on an AC power supply in an EX4500 switch.

AC Power Supply Specifications for EX4500 Switches

Table 2 lists the power supply specifications for an AC power supply used in EX4500 switches.

AC Power Cord Specifications for an EX4500 Switch

Each AC power supply for the EX4500 switch 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.

Each detachable AC power cord is 2.5 meters (approximately 8 feet) long. The appliance coupler end of the cord inserts into the AC appliance inlet on the faceplate of the AC power supply. The coupler type is C19 as described by the 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.

Table 3 lists the AC power cord specifications for an EX4500 switch for the countries and regions listed in the table.

Table 3: AC Power Cord Specifications for an EX4500 Switch

Country/Region	Electrical Specifications	Plug Standards	Juniper Model Number	Graphic
Argentina	250 VAC, 16 A, 50 Hz	IRAM Type RA/3/20	CBL-EX-PWR-C19-AR	No graphic available
Australia	250 VAC, 15 A, 50 Hz	AS/NZS 3112 Type SAA/3/15	CBL-EX-PWR-C19-AU
Brazil	250 VAC, 16 A, 50 Hz	NBR 14136: 2002 Type BR/3/20	CBL-EX-PWR-C19-BR	No graphic available
China	250 VAC, 16 A, 50 Hz	GB 1002 Type PRC/3/16	CBL-EX-PWR-C19-CH
Europe (except Italy, Switzerland, and United Kingdom)	250 VAC, 16 A, 50 Hz	CEE (7) VII Type VIIG	CBL-EX-PWR-C19-EU
India	250 VAC, 16 A, 50 Hz	SABS 164/1:1992 Type ZA/3	CBL-EX-PWR-C19-IN	No graphic available
Israel	250 VAC, 16 A, 50 Hz	SI 32/1971 Type IL/3	CBL-EX-PWR-C19-IL
Italy	250 VAC, 16 A, 50 Hz	CEI 23-16 Type I/3/16	CBL-EX-PWR-C19-IT
Japan	250 VAC, 16 A, 50 Hz	NEMA L6–20 Type NEMA Locking	CBL-EX-PWR-C19-JPL (default)
	125 VAC, 15 A, 50 Hz	NEMA 5-15 Type N5/15	CBL-EX-PWR-C19-JP110V
Korea	250 VAC, 16 A, 50 Hz	CEE (7) VII Type VIIG	CBL-EX-PWR-C19-KR
North America	125 VAC, 15 A, 50 Hz	NEMA 5–15 Type N5/15	CBL-EX-PWR-C19-US110V
South Africa	250 VAC, 16 A, 50 Hz	SABS 164/1:1992 Type ZA/3	CBL-EX-PWR-C19-SA
Switzerland	250 VAC, 16 A, 50 Hz	SEV 5934/2 Type 23G	CBL-EX-PWR-C19-SZ	No graphic available
Taiwan	250 VAC, 16 A, 50 Hz	NEMA L6-20P Type NEMA LOCKING	CBL-EX-PWR-C19-TW
United Kingdom	250 VAC, 13 A, 50 Hz	BS 1363/A Type BS89/13	CBL-EX-PWR-C19-UK

Power Cable Warning (Japanese)
Warning: The attached power cable is only for this product. Do not use the cable for another product.

DC Power Supply in EX4500 Switches

The DC power supply in EX4500 switches is a hot-insertable and hot-removable field-replaceable unit (FRU).

EX4500 switches are shipped with one power supply. A cover panel is installed in the second power supply slot. You can add a second power supply to the switch.

Power supplies are installed at the rear of the chassis in slots labeled 1 and 0. Both power supplies are accessible from the rear of the chassis.

Each DC power supply weighs approximately 3 lb (1.3 kg) and has a pair of DC input lugs (–48 VDC and RTN) on the front of the power supply. Each DC power supply also has a fan, a bicolor LED on the faceplate that indicates the status of the power supply, and a colored ejector lever. See Figure 4.

Figure 4: DC Power Supply

Each DC power supply has an ejector lever that holds the power supply in place. The ejector lever locks into the corresponding hole in the chassis. For instructions for installing the power supply, see Installing a DC Power Supply in an EX4500 Switch.

Each power supply has its own fan and is cooled by its own internal cooling system. The airflow for a power supply is from the front of the power supply to the back.

The color of the ejector lever on the power supply indicates the direction of airflow of the power supply.

• Green—Front-to-back airflow

The color of the power supply's ejector lever must match the color of the exhaust label visible through the vents of the installed fan tray. The color match indicates that the direction of airflow through the fan tray matches the direction of airflow through the power supply.

Each DC power supply provides power to all components in the switch. Two power supplies provide full power redundancy to the switch. If one power supply fails or is removed, the second power supply balances the electrical load without interruption. The switch reassesses the power required to support the switch configuration and issues error messages if the available power is insufficient.

The output for the DC power supply is 12 VDC. The output power is 1200 W.

DC Power Supply LEDs in EX4500 Switches

A DC power supply has one bicolor LED (labeled POK) on its faceplate. This LED displays information about the status of the power supply. See Figure 5.

Figure 5: DC Power Supply LED in EX4500 Switches

Table 4 describes the LED on a DC power supply in an EX4500 switch.

DC Power Specifications for EX4500 Switches

Table 5 lists the power specifications for the DC power supply used in EX4500 switches.