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Power Supplies

The services gateway uses either AC or DC power supplies. The device is configurable with two, three, or four AC power supplies or two or four DC power supplies. The power supplies connect to the midplane, which distributes the different output voltages produced by the power supplies to the device components, depending on their voltage requirements. Each power supply is cooled by its own internal cooling system.

Power Supply Installation and Replacement

Caution: The device cannot be powered from AC and DC power supplies simultaneously. The first type of power supply detected by the device when initially powered on determines the type of power supply allowed by the device. All installed power supplies of the other type are disabled by the device. If you install a power supply of the other type while the device is operating, the device disables the power supply and generates an alarm.

Note: Devices configured with DC power supplies are shipped with a blank panel installed over the power distribution modules. Devices configured with AC power supplies have no blank panel.

For information about site power requirements, see Power Guidelines, Requirements, and Specifications. For information about connecting the services gateway to power and ground, see Connecting Power to an AC-Powered Services Gateway and Chassis Grounding.

Redundant power supplies are hot-removable and hot-insertable, as described in Field-Replaceable Units (FRUs). When you remove a power supply from a device that uses nonredundant power supply configuration, the device may shut down depending on your configuration. For power supply replacement instructions, see Replacing Power System Components.

AC Power Supply

Each AC power supply weighs approximately 5.0 lb (2.3 kg) and consists of one AC appliance inlet, an AC switch, a fan, and LEDs to monitor the status of the power supply. Figure 18 shows the power supply. Each inlet requires a dedicated AC power feed and a dedicated 15 A (250 VAC)circuit breaker.

Figure 18: AC Power Supply

Image g004209.gif

For more information about the AC power specifications, see AC Power Specifications and Guidelines.

Warning: The services gateway 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.

AC Power Supply Configurations

The SRX 5600 services gateway supports either the low-line (110V) AC power configuration or the high-line (220V) AC power configuration.

AC Power Supply LEDs

Each AC power supply faceplate contains three LEDs that indicate the status of the power supply (see Table 19). The power supply status is also reflected in two LEDs on the craft interface. In addition, a power supply failure triggers the red alarm LED on the craft interface.

Table 19: AC Power Supply LEDs

Label

Color

State

Description

AC OK

Amber

Off

AC power input voltage is below 78 VAC.

Green

On

AC power input voltage is within 78–264 VAC.

DC OK

Green

Off

DC power outputs generated by the power supply are not within the normal operating ranges.

On

DC power outputs generated by the power supply are within the normal operating ranges.

PS FAIL

Red

Off

Power supply is functioning normally.

On

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.

DC Power Supply

Each DC power supply weighs approximately 3.8 lb (1.7 kg) and consists of one DC input (–48 VDC and return), one 40 A (–48 VDC) circuit breaker, a fan, and LEDs to monitor the status of the power supply. Figure 19 shows the power supply. Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated facility circuit breaker.

Figure 19: DC Power Supply

Image g004210.gif

For DC power electrical specifications, see DC Power Specifications and Requirements.

DC Power Supply Configurations

In the DC power configuration, the device contains either two or four DC power supplies (see Figure 19) located at the rear of the chassis in slots PEM0 through PEM3 (left to right). You can upgrade your DC power system from two to four power supplies.

Four power supplies provide full redundancy. If a DC power supply in a redundant configuration is removed or fails, its redundant power supply takes over without interruption. The DC power supply in PEM2 serves as redundant to the DC power supply in slot PEM0, and the DC power supply in PEM3 serves as redundant to the DC power supply in slot PEM1. If only two DC power supplies are installed, they must be installed in slots PEM0 and PEM1 or in slots PEM2 and PEM3.

Table 20: Power Supply Redundancy and Power Distribution

DC Power Supply Slot Redundant Power Supply Power Supply Provides Power to the Following Components

PEM0

PEM1

Fan tray, IOC or SPC slots 0 and 1, and SCB slots 0 and 1

PEM1

PEM0

Fan tray, IOC or SPC slots 0 and 1, and SCB slots 0 and 1

PEM2

PEM3

Fan tray and IOC or SPC slots 2 through 5

PEM3

PEM2

Fan tray and IOC or SPC slots 2 through 5

DC Power Supply LEDs

Each DC power supply faceplate contains three LEDs that indicate the status of the power supply (see Table 21). The power supply status is also reflected in two LEDs on the craft interface (see Table 15). In addition, a power supply failure triggers the red alarm LED on the craft interface.

Note: An SCB must be present for the PWR OK LED to go on.

Table 21: DC Power Supply LEDs

Label

Color

State

Description

PWR OK

Green

Off

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

On

Power supply is functioning normally.

Amber

On

The main output voltage is out of range (lower limit: 37.5 V to 39.5 V; upper limit: 72.5 V to 76 V).

BRKR ON

Green

Green

Off

DC power supply circuit breaker is turned off.

On

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

INPUT OK

Green

Off

DC input to the PEM is not present.

On

DC input is present and is connected in correct polarity.

 

Amber

On

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


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