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AC Power Supply in an EX 8200 series Switch

The AC power supply in EX 8200 series switches is a hot-insertable and hot-removable field-replaceable unit (FRU).

You can install up to six AC power supplies in an EX 8200 series switch. Power supplies are installed at the bottom of the chassis in slots PSU 0 through PSU 5 (left to right). All power supplies are accessible from the front of the chassis.

Warning: The switch is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal 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 ground.

Note: All base configuration EX 8200 series switches are shipped with two power supplies. Cover panels are installed over the remaining four power supply slots. Additional power supplies can be added to base configuration switches as necessary.

See EX 8208 Switch Configurations for details about different EX 8208 switch configurations.

See EX 8216 Switch Configurations for details about different EX 8216 switch configurations.

Each AC power supply weighs approximately 7 lb (3.2 kg) and has an independent 16 A rated AC inlet on its front. Each inlet requires a dedicated AC power feed. Each AC power supply has an Enable switch, a fan, and three LEDs on the faceplate that indicate the status of the power supply. See Figure 1.

Figure 1: AC Power Supply

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Each AC power supply comes with a power retainer that holds the power cord in place. See Figure 2. The power retainer has a clip and an adjustment nut. The L-shaped ends of the clip hook into the bracket holes on each side of the AC appliance inlet on the faceplate. The adjustment nut holds the power cord in the correct position. For instructions for installing the power retainer, see Connecting AC Power to an EX 8200 series Switch.

Figure 2: Power Retainer for an AC Power Supply

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Each power supply connects to the backplane in an EX 8208 switch and to the midplane in an EX 8216 switch. The backplane and the midplane distribute the output power produced by the power supplies to different switch components. Each AC power supply provides power to all the components in the switch.

An EX 8208 switch supports 2000 W AC power supplies. An EX 8216 switch supports both 2000 W AC power supplies and 3000 W AC power supplies.

The 2000 W AC power supply supports both the low-line (100–120 VAC) and the high-line (200–240 VAC) AC power configurations. In both cases, the output is 52 VDC. The output power is 1200 W for low-line input and 2000 W for high-line input.

The 3000 W AC power supply supports only the high-line (200–240 VAC) AC power configuration. Low-line input is not supported for the 3000 W AC power supplies on the EX 8216 switch. The output is 52 VDC. The output power is 3000 W for high-line input.

An N+1 power configuration is required for normal operation of EX 8200 series switches. In an N+1 power configuration, if one power supply fails or is removed, the remaining power supplies continue to supply power for the system without interruption.

The configuration type of the switch and the input voltage determine the number of power supplies needed (N) for an EX 8200 series switch. You must install an additional power supply to meet the N+1 power redundancy configuration required for all EX 8200 series switches. See EX 8208 Switch Configurations for details about different EX 8208 switch configurations. See EX 8216 Switch Configurations for details about different EX 8216 switch configurations.


Table 1 lists the N+1 power requirements of different EX 8208 switch configurations that use 2000 W AC power supplies.

Table 1: N+1 Power Redundancy Configurations for Different EX 8208 Switch Configurations Using 2000 W AC Power Supplies

Switch Configuration

Input Voltage

Power Supplies Needed (N)

Power Supplies Required for
N+1 Power Redundancy

Base

  • High line (200–240 VAC)
  • Low line (100–120 VAC)
  • 1
  • 2
  • 2
  • 3

Fully loaded chassis

  • High line (200–240 VAC)
  • Low line (100–120 VAC)
  • 3
  • 5
  • 4
  • 6

Table 2 lists the N+1 power requirements of different EX 8216 switch configurations that use 2000 W AC power supplies.

Table 2: N+1 Power Redundancy Configurations for Different EX 8216 Switch Configurations Using 2000 W AC Power Supplies

Switch Configuration

Input Voltage

Power Supplies Needed (N)

Power Supplies Required for
N+1 Power Redundancy

Base

  • High line (200–240 VAC)
  • Low line (100–120 VAC)
  • 2
  • 2
  • 3
  • 3

Fully loaded chassis

  • High line (200–240 VAC)
  • Low line (100–120 VAC)
  • 5
  • Not supported
  • 6
  • Not supported

Table 3 lists the N+1 power requirements of different EX 8216 switch configurations that use 3000 W AC power supplies.

Table 3: N+1 Power Redundancy Configurations for Different EX 8216 Switch Configurations Using 3000 W AC Power Supplies

Switch Configuration

Input Voltage

Power Supplies Needed (N)

Power Supplies Required for
N+1 Power Redundancy

Base

  • High line (200–240 VAC)
  • 1
  • 2

Fully loaded chassis

  • High line (200–240 VAC)
  • 5
  • 6

Each power supply has its own fan and is cooled by its own internal cooling system. The airflow is from the front of the power supply to the back. Hot air exhausts from the rear of the chassis.


Updated: 2009-04-09

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