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.

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

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.

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

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.

Figure 2: 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.

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.

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.

Figure 3: 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.

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.

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.

Figure 4: AC Plug Types

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

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.

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.

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.

Figure 6: 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.

SRX5800 Services Gateway DC Power Supply Specifications

Table 12 lists the DC power supply electrical specifications.

Table 13 lists the power system electrical specifications.

DC Power Cable Specifications for the SRX5800 Services Gateway

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

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.

SRX5800 Services Gateway Chassis Grounding Point Specifications

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

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.

SRX5800 Services Gateway Grounding Cable Specifications

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

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