SRX5400 Power System

The firewall uses either AC or DC power supplies.

The firewall is configurable with two, three, or four AC power supplies by default (optionally, a fourth power supply can be added) or two DC power supplies. The AC power supplies are located horizontally at the rear of the chassis in slots PEM0 through PEM3 (left to right) and the DC power supplies are located in slots PEM0 and PEM2. The power supplies connect to the midplane, which distributes the different output voltages produced by the power supplies to the firewall components, depending on their voltage requirements. Each power supply is cooled by its own internal cooling system.

Redundant power supplies are hot-removable and hot-insertable. When you remove a power supply from a firewall that uses a nonredundant power supply configuration, the firewall might shut down depending on your configuration.

Table 1 summarizes the available power supply types, their output capacities, and their redundancy and power distribution schemes. For detailed power supply specifications, see SRX5400 Firewall AC Power Supply Specifications or SRX5400 Firewall DC Power Supply Specifications.

In all power supply configurations, the power distribution and total power is shared by all of the components in the firewall chassis. The power supplies are guaranteed to provide adequate power to the system. In the low-line (110VAC input) and high-line (220VAC input) configurations, two power supplies are required to support the firewall electrical requirements.

Each AC power supply consists of one AC appliance inlet, an AC switch, a fan, and LEDs to monitor the status of the power supply. Figure 1 shows the power supply. Each inlet requires a dedicated AC power feed and a dedicated 16 A @ 100 VAC or 16 A @ 200 VAC circuit breaker, or as required by local code.

Figure 1: AC Power Supply

Table 3 lists the AC power supply electrical specifications.

Table 4 lists the AC power system electrical specifications.

Each AC power supply faceplate contains three 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 major alarm LED on the craft interface.

Each AC power supply has a single AC appliance inlet located on 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 firewall. An AC power cord connects each power supply to the power distribution panel.

The firewall is not shipped with AC power cords. You must order power cords separately using the model number shown in Table 6. The C19 appliance coupler end of the cord see Figure 2, 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.

Figure 2: C19 Appliance Coupler

Table 6 provides specifications and depicts the plug on the AC power cord provided for each country or region.

Each AC power supply has a single AC appliance inlet located on the power supply that requires a dedicated AC power feed. We recommend that you use a customer site circuit breaker rated for 15 A (250 VAC) minimum for each AC power supply, or as required by local code. Doing so enables you to operate the firewall in any configuration without upgrading the power infrastructure.

Each DC power supply 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 3 shows the power supply. Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated facility circuit breaker.

We recommend that you provision 60 A or 70 A per feed, depending on the selected DIP switch setting.

Figure 3: DC Power Supply Faceplate

Table 7 lists the DC power supply electrical specifications. Table 8 lists the DC power system specifications.

Each DC power supply faceplate contains three LEDs that indicate the status of the power supply (see Table 9). In addition, a power supply failure triggers the major alarm LED on the craft interface.

Table 10 summarizes the specifications for the power cables, which you must supply.

The accessory box shipped with the firewall includes the cable lugs that attach to the terminal studs of each power supply (see Figure 4).

Figure 4: DC Power Cable Lug

Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated facility circuit breaker. We recommend that you use a customer site circuit breaker rated for 40 A (–48 VDC) minimum for each DC power supply, or as required by local code. Doing so enables you to operate the firewall in any configuration without upgrading the power infrastructure.

If you plan to operate a DC-powered firewall at less than the maximum configuration and do not provision a 40 A (–48 VDC) circuit breaker, we recommend that you provision a circuit breaker for each DC power supply rated for at least 125% of the continuous current that the system draws at –48 VDC, or as required by local code.

Figure 5 shows a typical DC source cabling arrangement.

Figure 5: Typical DC Source Cabling to the firewall

The DC power supplies must be powered by dedicated power feeds.

The firewall chassis has one grounding point at the upper right corner of the back panel. The grounding point consists of two threaded holes spaced 0.625-in. (15.86-mm) apart (Figure 6). The grounding point holes fit UNC 1/4–20 screws. The accessory box shipped with the firewall 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 firewall grounding point.

Figure 6: SRX5400 Firewall Grounding Point

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

The grounding cable that you provide must meet the specifications in Table 11.

The accessory box shipped with the firewall includes the cable lug that attaches to the grounding cable (see Figure 7) and two UNC 1/4–20 screws used to secure the grounding cable to the grounding points.

Figure 7: Grounding Cable Lug