SRX550 Services Gateway Power Supply

The SRX550 Services Gateway uses either one AC or one DC power supply unit (PSU). The services gateway is equipped with one AC power supply (see Figure 7) for non-power redundancy. A second PSU is optional (sold separately) for power redundancy. A second PSU can be used to meet power requirements exceeding the wattage provided by a single PSU (a nonredundant configuration). The two power supplies, either both AC or both DC, will load-share and provide power redundancy to the services gateway, increasing its availability and reliability. If one power supply fails or is removed, the other power supply redistributes the electrical load without interruption. The services gateway reassesses the power required to support its configuration and issues errors if the available power is insufficient. Figure 8 shows the diagram of the DC power supply.

Caution: Do not mix AC and DC power supplies within the same services gateway because this can damage the device.

All power supplies are hot-swappable and support single or dual redundant power supply versions. Each power supply is cooled by the system’s fans.

Figure 7: AC Power Supply

AC Power Supply

Figure 8: DC Power Supply

DC Power Supply

The power supplies provide different output wattage to the services gateway components according to the voltage requirements of the components.

The power supply components are listed in Table 8.

Table 8: Component Power Output/Consumption

Power Supply

Output/Consumption

645 W AC power supply

This power supply can provide:

  • 390 W at 12 V
  • 255 W PoE on a single power supply, or with redundancy using the two power supplies
  • 510 W PoE using the two power supply option operating as nonredundant

Note: Using the two power supply option operating as nonredundant for up to 510 W PoE power, the administrator has the ability to prioritize the PoE ports that will receive power if an outage should occur to either the power source or to one of the power supplies.

645 W DC power supply

This power supply can provide:

  • 390 W at 12 V
  • 255 W PoE on a single power supply, or with redundancy using the two power supply option
  • 510 W PoE using the two power supply option operating as nonredundant

Note: Using the two power supply options operating as nonredundant for up to 510 W PoE, the administrator has the ability to prioritize the PoE ports that will receive power if an outage should occur to either the power source or to one of the power supplies.

The DC power supply has connections for two DC power feeds labeled A and B, each with a positive (+) and a negative (-) terminal. You can connect the DC power supply to both the feeds. If either feed fails, the power supply draws all its power from the other feed. This configuration provides the commonly deployed A/B feed redundancy for the system. Table 9 describes the connection terminals on the DC power supply.

Table 9: DC Power Supply Terminals

Feed

Label

Description

Feed A

A+

RTN connection for Feed A

A-

-48VDC connection for Feed A

Feed B

B+

RTN connection for Feed B

B-

-48VDC connection for Feed B

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