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DC Power Supply in Junos Space Appliances

This topic applies to the following Junos Space Appliances: JA1500 and JA2500.

A Junos Space Appliance ships with a single AC power supply module. However, you can use a DC power supply, shown in Figure 1, to power the appliance.


While it is possible to provide redundancy in the Junos Space Appliance using a combination of AC and DC power supply modules, we recommend that you do not provide redundancy in this manner. Instead, use two DC power supply modules or two AC power supply modules if you want to provide redundancy.

Figure 1: DC Power Supply ModuleDC Power Supply Module

Table 1 shows details of the DC power supply module for a Junos Space Appliance.

Table 1: Details of a DC Power Supply Module



Model number


Field-Replaceable Unit type

Cold-swappable, if the appliance has only one power supply module

Hot-swappable, if the appliance has an additional redundant, functioning power supply module that is plugged into a separate power circuit

Power supply weight

2.60 lb (1.18 kg)


One internal fan per power supply module


From the front of the chassis to the back

Power Supply Module (Status) LED

One Power Supply Module LED present on the power supply faceplate:

  • Green indicates that the power supply module is working properly; the module is powered on and is powering the appliance.

  • Amber indicates that the power supply module is in standby mode; the module is powered on but it is not powering the appliance.

  • Off indicates that the power supply module is not powered on or that the module is not working properly.

Maximum Output Power

560 W

DC Maximum Current

20 A

DC Power Module

–45 V to –60 V

DC Power Supply Peak inrush

< 60 A

Power Module Maximum Efficiency

80Plus 560 W cDC