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SRX5800 Power System

 

SRX5800 Services Gateway Power System Overview

The SRX5800 Services Gateway uses either AC or DC power supplies. The services gateway is configurable with two to 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 services gateway components, depending on their voltage requirements.

Table 1 describes the different types of power supplies available.

Table 1: Power Supply Type Summary

Power Supply Type

Input Condition (If Any)

Maximum Output

Redundancy

Power Distribution

AC standard-capacity

 

1700 W

3+1

Shared

AC high-capacity

One AC input

1700 W

2+2

Zoned

Two AC inputs

4100 W

DC standard-capacity

 

1700 W

DC high-capacity

One DC input

1700 W

Two DC inputs

4100 W

Note

The services gateway must be running Junos OS Release 10.4 or later in order to use high-capacity AC power supplies. The services gateway must be running Junos OS Release 12.1X44-D10 or later in order to use high-capacity DC power supplies.

Redundant power supplies are hot-removable and hot-insertable. Each power supply is cooled by its own internal cooling system.

Note

Devices configured from the factory 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.

Caution

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

When the services gateway is powered by standard-capacity AC power supplies, the services gateway contains either three or four AC power supplies, located at the rear of the chassis in slots PEM0 through PEM3 (left to right). Each power supply provides power to all components in the services gateway. When three power supplies are present, they share power almost equally within a fully populated system. Four power supplies provide full power redundancy. If one power supply fails or is removed, the remaining power supplies instantly assume the entire electrical load without interruption. Three power supplies provide the maximum configuration with full power for as long as the services gateway is operational.

When the services gateway is powered by either standard- or high-capacity DC power supplies, or by high-capacity AC power supplies, power distribution within the chassis is divided into zones, as described in Table 2.

Table 2: SRX5800 Services Gateway Power Distribution (DC or High-Capacity AC Power Supplies)

Zone

Power Supplies

Provide Power To:

Zone 0

  • PEM0

  • PEM2

  • Bottom fan tray

  • IOC or SPC slots 6 through 11

  • SCB slots 1 and 2

Zone 1

  • PEM1

  • PEM3

  • Upper fan tray

  • IOC or SPC slots 0 through 5

  • SCB slot 0

Figure 1 shows the distribution of power from the power supplies to the chassis components in an SRX5800 Services Gateway chassis powered by DC power supplies or high-capacity AC power supplies.

Figure 1: Power Distribution from DC and High-Capacity AC Power Supplies in the SRX5800 Services Gateway Chassis
Power Distribution from
DC and High-Capacity AC Power Supplies in the SRX5800 Services Gateway
Chassis
Note

The craft interface draws its power from the SCBs installed in the SCB slots 0, 1, and 2 at the center of the card cage. In the standard configuration, with SCBs in slots 0 and 1, the craft interface is powered on even when one of the two zones loses power. But if the chassis only has one SCB installed, the craft interface draws all of its power from that card, and consequently is powered off if the zone in which that SCB is installed loses power.

You can install either two or four DC power supplies or high-capacity AC power supplies. Two power supplies are required to power the two zones, while four power supplies provide full redundancy for both zones. The power supplies in slots PEM0 and PEM2 form a redundant pair, as do the power supplies in slots PEM1 and PEM3. When two power supplies are installed for a zone, they share the load. If a power supply fails, its redundant power supply assumes the full load of that zone without interruption.

If you do install only two power supplies, they must be installed so that one is in an odd-numbered slot and the other is in an even-numbered slot. For example, you can install one high-capacity AC power supply in each of the slots PEM0 and PEM1.

SRX5800 Services Gateway Standard-Capacity AC Power Supply

Each standard-capacity AC power supply has a corresponding AC appliance inlet located in the chassis directly above the power supply. Each inlet requires a dedicated AC power feed and a dedicated 15 A (250 VAC) circuit breaker. See Figure 2.

Warning

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the services gateway chassis must be adequately grounded before power is connected. See Grounding the SRX5800 Services Gateway for instructions.

Figure 2: Standard-Capacity AC Power Supply
Standard-Capacity AC Power
Supply

SRX5800 Services Gateway Standard-Capacity AC Power Supply LEDs

Each standard-capacity AC power supply faceplate contains three LEDs that indicate the status of the power supply (see Table 3). 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 3: Standard Capacity AC Power Supply LEDs

Label

Color

State

Description

AC OK

Green

Off

AC power applied to power supply is not within the normal operating range.

On

AC power applied to power supply is within the normal operating range.

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. Check AC OK and DC OK LEDs for more information.

SRX5800 Services Gateway High-Capacity AC Power Supply

High-capacity AC power supplies provide a maximum of 4100 W of power each. Two high-capacity power supplies are required, and you can install four high-capacity power supplies for redundancy. Each high-capacity AC power supply has two corresponding AC appliance inlets: one located in the chassis directly above the power supply and one located near the top edge of the power supply itself. For each power supply, you connect one power cord to the inlet on the chassis above the power supply and one power cord to the inlet on the power supply itself. Each inlet you connect requires a dedicated AC power feed and a dedicated 15 A (250 VAC) circuit breaker. See Figure 3.

Note

The services gateway cannot be powered from standard-capacity and high-capacity AC power supplies simultaneously. The one exception is during the process of replacing standard-capacity AC power supplies with high-capacity AC power supplies, when it is permissible to have both types installed briefly.

Note

The high-capacity power supply will operate with only one of its two AC inlets connected to an AC power feed. However, its DC output will be limited to a maximum of 1700 W. We recommend that you connect two AC power feeds to each high-capacity AC power supply.

Note

The services gateway must be running Junos OS Release 10.4 or later in order to use high-capacity AC power supplies.

Each high-capacity AC power supply has an input mode switch, covered by a small metal plate. The input mode switch tells the system the number of AC power feeds it should expect. The input mode switch settings are described in Table 4. The default setting is 1.

Table 4: High-Capacity AC Power Supply Input Mode Switch Settings

Mode Switch Setting

AC Inputs

Result

1

Both AC inlets powered

AC output of 4100 W

AC OK LED lights

Only one AC inlet powered

AC output of 1700 W

AC OK LED lights

0

Both AC inlets powered

AC output of 4100 W

AC OK LED lights

Only one AC inlet powered

AC output disabled

AC OK LED unlit

Note

We recommend that you set the input mode switch to 1 and connect two AC input feeds to each high-capacity AC power supply.

Warning

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the services gateway chassis must be adequately grounded before power is connected. See Grounding the SRX5800 Services Gateway for instructions.

Figure 3: High-Capacity AC Power Supply
High-Capacity AC
Power Supply

SRX5800 Services Gateway High-Capacity AC Power Supply LEDs

Each high-capacity AC power supply faceplate contains four LEDs that indicate the status of the power supply (see Table 5). 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 5: High-Capacity AC Power Supply LEDs

Label

Color

State

Description

AC-1 OK

Green

Off

AC power applied to power supply at the upper appliance inlet is not within the normal operating range.

On

AC power applied to power supply at the upper appliance inlet is within the normal operating range.

AC-2 OK

Green

Off

AC power applied to power supply at the lower appliance inlet is not within the normal operating range.

On

AC power applied to power supply at the lower appliance inlet is within the normal operating range.

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. Check the AC-1 OK, AC-2 OK, and DC OK LEDs for more information.

SRX5800 Services Gateway AC Power Supply Specifications

Table 6 lists the AC power supply electrical specifications for both the standard-capacity and high-capacity AC power supply. Table 7 lists the AC power system electrical specifications.

Table 6: AC Power Supply Electrical Specifications

Item

Specification

Standard-Capacity

High-Capacity

Maximum output power

1700 W

4100 W (two AC inputs)

1700 W (one AC input)

AC input current rating

11 A  @ 240 VAC maximum

13 A @ 240 VAC maximum per AC input (26 A per power supply when two AC inputs are used)

AC input voltage

Operating range: 200 to 240 VAC

AC input line frequency

50 to 60 Hz

Efficiency

~88%

Note: This value is at full load and nominal voltage.

Table 7: AC Power System Specifications

Item

Normal-Capacity

High-Capacity

Two AC inputs for each power supply

One AC input for each power supply

Redundancy

3+1

2+2

2+2

Output power (maximum) per supply

1700 W

4100 W

1700 W

Output power (maximum) per system

5100 W

8200 W

3400 W

AC Power Cord Specifications for the SRX5800 Services Gateway

Each AC power supply has a single AC appliance inlet located in the chassis directly above 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 services gateway. An AC power cord connects each power supply to the power distribution panel.

The services gateway is not shipped with AC power cords. You must order power cords separately using the model number shown in Table 8. The C19 appliance coupler end of the cord inserts into the AC appliance inlet coupler, type C20 (right angle) as described by International Electrotechnical Commission (IEC) standard 60320. The plug end of the power cord fits into the power source receptacle that is standard for your geographical location.

Table 8 provides specifications and Figure 4 depicts the plug on the AC power cord provided for each country or region.

Table 8: AC Power Cord Specifications

Country

Model Number

Electrical Specification

Plug Type

Australia

CBL-M-PWR-RA-AU

240 VAC, 50 Hz AC

SAA/3

China

CBL-M-PWR-RA-CH

220 VAC, 50 Hz AC

PSB-10

Europe (except Denmark, Italy, Switzerland, and United Kingdom)

CBL-M-PWR-RA-EU

220 or 230 VAC, 50 Hz AC

CEE 7/7

Italy

CBL-M-PWR-RA-IT

230 VAC, 50 Hz AC

CEI 23-16/VII

Japan

CBL-M-PWR-RA-JP

220 VAC, 50 or 60 Hz AC

NEMA L6-20P

North America

CBL-M-PWR-RA-TWLK-US

250 VAC, 60 Hz AC

NEMA L6-20P

 

United Kingdom

CBL-M-PWR-RA-UK

240 VAC, 50 Hz AC

BS89/13

Figure 4: AC Plug Types
AC Plug Types
Warning

The AC power cord for the services gateway is intended for use with the services gateway only and not for any other use.

Warning

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must properly ground the services gateway chassis before connecting power. See Grounding the SRX5800 Services Gateway for instructions.

Caution

Power cords and cables must not block access to services gateway components or drape where people could trip on them.

Note

In North America, AC power cords must not exceed 4.5 m (approximately 14.75 ft) in length, to comply with National Electrical Code (NEC) Sections 400-8 (NFPA 75, 5-2.2) and 210-52, and Canadian Electrical Code (CEC) Section 4-010(3). The cords listed in Table 8 are in compliance.

AC Power Circuit Breaker Requirements for the SRX5800 Services Gateway

Each AC power supply has a single AC appliance inlet located in the chassis directly above the power supply that requires a dedicated AC power feed. We recommend that you use a dedicated customer site circuit breaker rated for 15 A (250 VAC) minimum for each AC power supply, or as required by local code.

SRX5800 Services Gateway Standard-Capacity DC Power Supply

In the DC power configuration, the services gateway contains either two or four DC power supplies (see Figure 5), located at the lower 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 fails, its redundant power supply takes over without interruption.

Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated 80 A (–48 VDC) circuit breaker for the maximum hardware configuration.

Figure 5: Standard-Capacity DC Power Supply
Standard-Capacity DC Power
Supply

SRX5800 Services Gateway Standard-Capacity DC Power Supply LEDs

Each standard-capacity DC power supply faceplate contains three LEDs that indicate the status of the power supply (see Table 9). 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 9: 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.

BREAKER ON

Green

Off

DC power supply circuit breaker is turned off.

On

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 connected in reverse polarity.

SRX5800 Services Gateway High-Capacity DC Power Supply

High-capacity DC power supplies provide a maximum of 4100 W of power each. Two high-capacity DC power supplies are required, and you can install four high-capacity DC power supplies for redundancy. Each high-capacity DC power supply has inlets for two DC power feeds. The four power connectors (-48V and RTN for each of the two inlets) are located behind a clear plastic cover near the bottom of the power supply. Each DC power inlet you use requires a dedicated DC power feed and a dedicated 80 A circuit breaker. See Figure 6.

Note

The services gateway cannot be powered from standard-capacity and high-capacity DC power supplies simultaneously. The one exception is during the process of replacing standard-capacity DC power supplies with high-capacity DC power supplies, when it is permissible to have both types installed briefly.

Note

The high-capacity power supply will operate with only one of its two DC inlets connected to a DC power feed. However, its DC output will be limited to a maximum of 1700 W. We recommend that you connect two DC power feeds to each high-capacity DC power supply.

Note

The services gateway must be running Junos OS Release 12.1X44-D10 or later in order to use high-capacity DC power supplies.

Each high-capacity DC power supply has an input mode switch, covered by a small metal plate. The input mode switch tells the system the number of DC power feeds it should expect. The input mode switch settings are described in Table 10. The default setting is 1.

Table 10: High-Capacity DC Power Supply Input Mode Switch Settings

Mode Switch Setting

DC Inputs

Result

1

Both DC inlets powered

DC output of 4100 W

DC OK LED lights

Only one DC inlet powered

DC output of 1700 W

DC OK LED unlit

0

Both DC inlets powered

DC output of 4100 W

DC OK LED lights

Only one DC inlet powered

DC output disabled

DC OK LED unlit

Note

We recommend that you set the input mode switch to 1 and connect two DC input feeds to each high-capacity DC power supply.

Warning

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the services gateway chassis must be adequately grounded before power is connected. See Grounding the SRX5800 Services Gateway for instructions.

Figure 6: High-Capacity DC Power Supply
High-Capacity DC
Power Supply

SRX5800 Services Gateway High-Capacity DC Power Supply LEDs

Each high-capacity DC power supply faceplate contains four LEDs that indicate the status of the power supply (see Table 11). 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 11: High-Capacity DC Power Supply LEDs

Label

Color

State

Description

INP0 OK

Green

Off

DC power applied to the power supply at input INP0 is not within the normal operating range.

On

DC power applied to the power supply at input INP0 is within the normal operating range.

INP1 OK

Green

Off

DC power applied to the power supply at input INP1 is not within the normal operating range.

On

DC power applied to the power supply at input INP1 is within the normal operating range.

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. Check the INP0 OK, INP1 OK, and DC OK LEDs for more information.

SRX5800 Services Gateway DC Power Supply Specifications

Table 12 lists the DC power supply electrical specifications.

Table 12: DC Power Supply Electrical Specifications

Item

Standard-Capacity

High-Capacity

Two-Feed Mode

One-Feed Mode

Maximum output power

2800 W

4100 W

1700 W

DC input voltage

Nominal: –48 VDC

Operating range: –40 to –72 VDC

Nominal: –48 VDC

Operating range: –40 to –72 VDC

Nominal: –48 VDC

Operating range: –40 to –72 VDC

Maximum input current rating @ 40 VDC

70 A

128 A for both feeds (66 A and 62 A per feed)

52 A

DC nominal input current rating @48 VDC

58 A maximum@–48 VDC (nominal)

104 A for both feeds (54 A and 50 A per feed)

42 A

Efficiency

99%

86%

Note: This value is at full load and nominal voltage.

Internal Circuit Breaker

80 A

Table 13 lists the power system electrical specifications.

Table 13: Power System Electrical Specifications

Item

Normal-Capacity

High-Capacity

Redundancy

2+2

2+2

Output power (maximum) per supply

2800 W

Two-feed mode

One-feed mode

4100 W

1700 W

Output power (maximum) per system

5600 W

8200 W

3400 W

DC Power Cable Specifications for the SRX5800 Services Gateway

Table 14 summarizes the specifications for the power cables, which you must supply.

Table 14: DC Power Cable Specifications

Cable Type

Quantity

Specification

Power

Four 6-AWG (13.3 mm2) cables for each power supply

Minimum 60°C wire, or as required by the local code

Caution

You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.

DC Power Cable Lug Specifications for the SRX5800 Services Gateway

The accessory box shipped with the services gateway includes the cable lugs that attach to the terminal studs of each power supply (see Figure 7).

Figure 7: DC Power Cable Lug
DC Power Cable Lug
Caution

Before services gateway installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the services gateway.

Warning

The services gateway is a pluggable type A equipment installed in restricted access location. It has a separate protective earthing terminal [Metric -M6 and English - ¼-20 screw) ground lugs] provided on the chassis. This separate protective earth terminal must be permanently connected to earth.

DC Power Circuit Breaker Requirements for the SRX5800 Services Gateway

If you plan to operate a maximally configured DC-powered services gateway with standard-capacity power supplies, we recommend that you provision at least 116 A (58 A per feed) @ –48 VDC (nominal) for the system. Use a customer site circuit breaker rated according to respective National Electrical Code and customer site internal standards to maintain proper level of protection for the current specified above.

If you plan to operate a maximally configured DC-powered services gateway with high-capacity power supplies, we recommend that you provision at least 208 A (104 A per supply) @ –48 VDC (nominal) for the system. This is maximum current draw at –48 VDC when two power supplies are providing the power to the system and the redundant power supplies are not supplying power or not present. Use a customer site circuit breaker rated according to respective National Electrical Code and customer site internal standards to maintain proper level of protection for the current specified above.

If you plan to operate a DC-powered services gateway at less than the maximum configuration, we recommend that you provision a circuit breaker according to respective National Electrical Code and customer site internal standards to maintain proper level of protection for the current specified above or each DC power supply rated for at least 125% of the continuous current that the system draws at –48 VDC.

DC Power Source Cabling for the SRX5800 Services Gateway

Figure 8 shows a typical DC source cabling arrangement.

Figure 8: Typical DC Source Cabling to the Services Gateway
Typical DC Source Cabling
to the Services Gateway

The DC power supplies in slots PEM0 and PEM1 must be powered by dedicated power feeds derived from feed A, and the DC power supplies in slots PEM2 and PEM3 must be powered by dedicated power feeds derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.

Caution

You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.

Warning

For field-wiring connections, use copper conductors only.

Caution

Power cords and cables must not block access to device components or drape where people could trip on them.

SRX5800 Services Gateway Chassis Grounding Point Specifications

Warning

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must properly ground the services gateway chassis before connecting power. See Grounding the SRX5800 Services Gateway for instructions.

Caution

Before services gateway installation begins, a licensed electrician must attach cable lugs to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the services gateway.

The services gateway chassis has two grounding points along the lower edge of the back panel. Each grounding point consists of two threaded holes spaced 0.625-in. (15.86-mm) apart (see Figure 9). The left grounding point fits M6 screws (European), and the right grounding point fits UNC 1/4–20 screws (American). The accessory box shipped with the services gateway includes the cable lug that attaches to the grounding cable and two UNC 1/4–20 screws used to secure the grounding cable to the right-side grounding point on the services gateway.

Figure 9: SRX5800 Services Gateway Chassis Grounding Points
SRX5800
Services Gateway Chassis Grounding Points

To ground the services gateway, you must connect a grounding cable to earth ground and then attach it to the chassis grounding point using the two screws provided.

Note

Additional grounding is provided to an AC-powered services gateway when you plug its power supplies into grounded AC power receptacles.

SRX5800 Services Gateway Grounding Cable Specifications

The grounding cable that you provide must meet the specifications in Table 15.

Table 15: Grounding Cable Specifications

Cable Type

Quantity and Specification

Grounding

One 6-AWG (13.3 mm2), minimum 60°C wire, or as required by the local code

Warning

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must properly ground the services gateway chassis before connecting power. See Grounding the SRX5800 Services Gateway for instructions.

SRX5800 Services Gateway Grounding-Cable Lug Specification

The accessory box shipped with the services gateway includes the cable lug that attaches to the grounding cable (see Figure 10) and two UNC 1/4–20 screws used to secure the grounding cable to the grounding points.

Figure 10: Grounding Cable Lug
Grounding Cable Lug
Caution

Before services gateway installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the services gateway.

Note

The same cable lug is used for the DC power cables.