Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
ON THIS PAGE
 

PTX5000 Power Planning

Calculating PTX5000 Power Consumption

Use the information in this topic to determine the power consumption for your router.

Note:

Starting in Junos OS Release 14.1, new power management features in Junos OS for PTX5000 ensure that the chassis power requirements do not exceed the power available to the PTX5000.

  • Power management ensures that high-priority FPCs continue to receive power when the system does not have sufficient power to keep all the FPCs online.

  • If a power supply fails, Junos OS can bring low-priority FPCs offline to allow high-priority FPCs to remain online.

For more information about configuring power management on the PTX5000, see Understanding Power Management on the PTX5000 in the Chassis-Level User Guide.

Power Requirements for PTX5000 Components

Table 1 describes the output power requirements for the required and optional FRUs for the PTX5000. The power requirements vary depending on the ambient air temperature for your installation.

Note:

The power requirements listed below are accurate for estimating typical power consumption at different ambient temperatures. However, Junos OS reserves additional power in the power budget for base system components—the host subsystem, the fan trays, and the SIBs. When planning for the minimum required PSMs, this power reserve must be included.

You can use the interactive Power Calculator application at https://pathfinder.juniper.net/power-calculator/ to determine the number of PSMs required to support your system configuration. The Power Calculator application requires Juniper.net login credentials.
Table 1: Power Requirements for PTX5000 Components

Component

25° C (77° F) Ambient Temperature

40° C (104° F) Ambient Temperature

Host subsystem with RE-DUO-C2600-16G Routing Engine, CB-PTX Control Board, and CCG

130 W

150 W

Host subsystem with RE-PTX-X8-64G Routing Engine, CB2-PTX Control Board, and CCG

182 W

187 W

FAN-PTX-V vertical fan tray

80 W

370 W

FAN-PTX-H horizontal fan tray

240 W

950 W

FAN3-PTX-H horizontal fan tray

330 W

900 W

SIB-I-PTX5008 SIBs (total power requirements for 9 SIBs)

380 W

450 W

SIB2-I-PTX5K SIBs (total power requirements for 9 SIBs)

450 W

510 W

SIB3-PTX5K SIBs (total power requirements for 9 SIBs)

1170 W

1170 W
FPCs

FPC-PTX-P1-A

420 W

500 W

FPC2-PTX-P1A

820 W

900 W

FPC3-PTX-U2

494 W

511 W

FPC3-PTX-U3

754 W

777 W
PICs

P1-PTX-24-10GE-SFPP

60 W

66 W

P1-PTX-24-10G-W-SFPP

82 W

100 W

P2-10G-40G-QSFPP

100 W

115 W

P3-24-U-QSFP28

131 W

134 W

P1-PTX-2-40GE-CFP

27 W

32 W

P3-15-U-QSFP28

119 W

123 W

P1-PTX-2-100GE-CFP

70 W

73 W

P2-100GE-CFP2

60 W

70 W

P2-100GE-OTN

135 W

160 W

P1-PTX-2-100G-WDM

250 W

264 W

Calculating Power Consumption for your Configuration

By using the information provided in Table 1, you can calculate the power consumption for your configuration.

  1. Determine the ambient temperature for your installation—25° C (77° F) or 40° C (104° F).
  2. Determine the output power in watts by adding together the power requirements for all the components in your chassis. The configuration must include:

    • One or two host subsystems

    • One vertical fan tray

    • Two horizontal fan trays

    • SIBs

      Note:

      Table 1 lists the total power requirements for nine SIBs.

    • Any FPCs or PICs specific to your configuration

  3. Determine the power consumption in watts by dividing the total output power requirements by the power efficiency:

    • PTX5000 AC and DC normal-capacity power supply module (PSM) efficiency is approximately 88% at full load and nominal voltage.

    • PTX5000 AC and DC high capacity PSM efficiency is approximately 90% at full load and nominal voltage.

The examples below show the power requirement calculations for different types of configurations:

Note:

All the examples below use RE-PTX-X8-64G Routing Engines, CB2-PTX Control Boards, FAN3-PTX-H horizontal fan trays, and SIB3-PTX5K SIBs.

  • This example shows the calculation for a non-redundant base configuration with no FPCs or PICs at 25° C (77° F) ambient temperature:

  • This example shows the calculation for a redundant base configuration with four FPC3-PTX-U3 FPCs and eight P3-15-U-QSFP28 PICs at 25° C (77° F) ambient temperature:

  • This example shows the calculation for a redundant base configuration with eight FPC3-PTX-U3 FPCs and sixteen P3-15-U-QSFP28 PICs at 40° C (104° F) ambient temperature:

Calculating System Thermal Output

After you have calculated the power consumption for your configuration, you can use that information to determine the system thermal output (BTUs per hour). To do so, multiply the power consumption in watts by 3.41.

For example, above we calculated the power consumption for a redundant base configuration with eight FPC3-PTX-U3 FPCs and sixteen P3-15-U-QSFP28 PICs at 40° C (104° F) ambient temperature to be 13,220 W. Using that information we can calculate the system thermal output for the configuration:

See Also

Understanding Normal-Capacity Power System Power Zones

PSM Slots

Note:

There is no power zoning in the High Capacity power system.

The PTX5000 normal-capacity power system has up to eight power supply modules (PSMs), located in the lower front of the chassis below the FPC card cage. The PSMs insert into one of four slots—labeled 0 through 3—located in the rear of each PDU labeled PDU0 and PDU1. For full power redundancy, a minimum number of PSMs must be installed and fully operational:

  • For full power redundancy, six PSMs are required to support up to four FPCs.

    • Zone 0—One PSM0 in each PDU

    • Zone 1—One PSM1 in each PDU

    • Zone 2—One PSM2 or PSM3 in each PDU

  • For full power redundancy, all eight PSMs are required to support five or more FPCs:

    • Zone 0—One PSM0 in each PDU

    • Zone 1—One PSM1 in each PDU

    • Zone 2—Both PSM2 and PSM3 in each PDU

Normal-Capacity Power Zones and PSM Fault Tolerance

The normal-capacity power system contains three power zones. Table 2 describes which components are powered by each zone and PSM. Table 3, Table 4, and Table 5 describe the fault tolerance for each zone.

Table 2: Components Powered by Each Zone

Zone

PSM

Component

0

0

Fan trays

1

1

The craft interface and the following components installed in the rear card cage: Routing Engines, Control Boards, CCGs, and SIBs.

  • Channel 1: Routing Engines and Control Boards

  • Channel 2: SIBs, CCGs, and craft interface

2

2

Any four FPCs in slots FPC0 through FPC7

3

Any four FPCs in slots FPC0 through FPC7
Table 3: Power Zone 0 Fault Tolerance

Nonredundant Configuration

Redundant Configuration
 

PDU0

PDU1

One PSM0 in either PDU can provide power to all fan trays.

PSM0 is required for full power redundancy.

If PSM0 in PDU0 is powered off or fails, the configuration becomes nonredundant.

PSM0 is required for full power redundancy.

If PSM0 in PDU1 is powered off or fails, the configuration becomes nonredundant.

If the nonredundant PSM in this zone is not powered on, the fan trays are not powered on, and the PTX5000 will not be powered on.

If neither PSM in this zone is powered on, the fan trays are not powered on, and the PTX5000 will not be powered on.

If the nonredundant PSM in this zone fails, the fan trays are not powered on, which will cause the PTX5000 to be powered off.

If both PSMs in this zone fail, the fan trays are not powered on, which will cause the PTX5000 to be powered off.
Table 4: Power Zone 1 Fault Tolerance

Nonredundant Configuration

Redundant Configuration
 

PDU0

PDU1

One PSM1 in either PDU can provide power to the craft interface, both host subsystems, both CCGs, and all nine SIBs.

PSM1 in PDU0 is required for full power redundancy.

If PSM1 in PDU0 is powered off or fails, the configuration becomes nonredundant.

PSM1 in PDU1 is required for full power redundancy.

If PSM1 in PDU1 is powered off or fails, the configuration becomes nonredundant.

If the nonredundant PSM in this zone is not powered on, the craft interface, host subsystems. CCGs, and SIBs are not powered on.

If PSM1 in PDU0 and PSM1 in PDU1 are not online, the craft interface, host subsystems, CCGs, and SIBs are not powered on.

If the nonredundant PSM in this zone fails, the craft interface, host subsystems. CCGs, and SIBs are powered off.

If PSM1 in PDU0 and PSM1 in PDU1 both fail, the craft interface, host subsystems, CCGs, and SIBs are powered off.

Table 5: Power Zone 2 Fault Tolerance

Number of FPCs

Nonredundant Configuration

Redundant Configuration

PDU0

PDU1

Up to four FPCs

The PSMs must be in different PDUs for full power redundancy.

One PSM2 or PSM3 in either PDU can provide nonredundant power.

PSM2 and PSM3 in the same PDU are nonredundant.

Two PSMs in this zone are required for full power redundancy.

One PSM2 or PSM3 must be installed in PDU0 and fully functional.

If PSM2 or PSM3 in PDU0 is powered off or fails, the configuration becomes nonredundant.

Two PSMs in this zone are required for full power redundancy.

One PSM2 or PSM3 must be installed in PDU1 and fully functional.

If PSM2 or PSM3 in PDU1 is powered off or fails, the configuration becomes nonredundant.

Five to eight FPCs

Two PSMs, one in each PDU can provide nonredundant power.

PSM2 and PSM3 in the same PDU is nonredundant.

CAUTION:

Three PSMs are nonredundant.

All four PSMs in this zone are required for full power redundancy.

PSM2 and PSM3 in PDU0 must be present and fully functional.

If PSM2 or PSM3 in PDU0 is powered off or fails, the configuration becomes nonredundant.

All four PSMs in this zone are required for full power redundancy.

PSM2 and PSM3 in PDU1 must also be present and fully functional.

If PSM2 or PSM3 in PDU0 is powered off or fails, the configuration becomes nonredundant.

If all four PSMs in this zone fail, all FPCs are powered off.

See Also