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MX2008 Power Planning

 

Calculating AC Power Requirements for MX2008 Routers

Note

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

The information in this topic helps you determine which of the two input ratings for the PSM is suitable for various configurations. You determine suitability by subtracting the total power draw from the maximum output of the PSMs. Afterward, you calculate the required input current. Finally, you calculate the thermal output.

We recommend that you provision power according to the maximum input current listed in the power system electrical specifications.

Use the following procedures to calculate the power requirement:

  1. Calculate the power requirement.
  2. Evaluate the power budget.
  3. Calculate input power.
  4. Calculate thermal output (BTUs) for cooling requirements.

To calculate the AC power requirements:

  1. Calculate the power (usage) using the values (see MX2008 AC Power Requirements).
  2. Evaluate the power budget, including the budget for each configuration if applicable, and check the required power against the maximum output power of available PDM options.

    Table 1 lists the three-phase delta and wye feed requirements, maximum input and output power per PSM, and power efficiency.

    Table 1: Calculating AC Power Budget

    Power Distribution Module

    Typical Input Power per PSM

    Maximum Input Power per PSM

    Maximum Output Power per PSM

    Power Supply Module Efficiency

    Three-phase delta AC PDM (2 per system)—50 A feed (input #1), and 25 A feed (input #2)

    2142 W

    2800 W

    2500 W

    91%

    Three-phase wye AC PDM (2 per system)—30 A feed (input #1), and 15 A feed (input #2)

    2142 W

    2800 W

    2500 W

    91%

  3. To calculate necessary input power for three-phase delta AC PDM, follow the procedure below (see Figure 1).
    Figure 1: AC PDM Three-Phase Delta Input Power
    AC PDM
Three-Phase Delta Input Power

    AC PSM VIN=200-240 single phase:

    1. Two AC PSMs are connected in parallel between two lines.
    2. Nominal value of input current for one AC PSM is 2800 W / 200 V = 14 A.
    3. Nominal input current for two AC PSMs is 2 * 14 A = 28 A.
    4. Nominal value of line current is 28 A * √3 = 48.5 A.
    5. Current rating for input 1 is 50 A.
    6. Only one AC PSM is connected between two lines.
    7. Nominal value of input current for one AC PSM is 2800 W / 200 V = 14 A.
    8. Nominal value of line current is 14 A * √3 = 24.5 A.
    9. Current rating for input 2 is 25 A.
  4. To calculate necessary input power for three-phase wye AC PDM, follow the procedure below (see Figure 2).
    Figure 2: AC PDM Three-Phase Wye Input Power
    AC PDM
Three-Phase Wye Input Power

    AC PSM VIN=200-240 single phase:

    1. Two AC PSMs are connected in parallel between two lines and neutral.
    2. Nominal value of input current for one AC PSM is 2800 W / 200 V = 14 A.
    3. Nominal input current for two AC PSMs is 2 * 14 A = 28 A.
    4. Nominal value of line current is 28 A.
    5. Current rating for input 1 is 28 A.
    6. Only one AC PSM is connected between two lines and neutral.
    7. Nominal value of input current for one AC PSM is 2800 W / 200 V = 14 A.
    8. Nominal value of line current is 14 A.
    9. Current rating for input 2 is 14 A.
  5. Calculate thermal output (BTUs). Multiply the input power requirement (in watts) by 3.41 as shown in Table 2.

    Table 2: Calculating AC Thermal Output

    Power Distribution Module

    Thermal Output (BTUs per hour)

    MX2000 three-phase delta AC PDM

    Maximum power divided by 0.91 * 3.41 = BTU/hr.

    Input power = Maximum power divided by 0.91

    See MX2008 AC Power Requirements to calculate maximum power, which is dependent on configuration and temperature.

    MX2000 three-phase wye AC PDM

    Maximum power divided by 0.91 * 3.41 = BTU/hr.

    Input power = Maximum power divided by 0.91

    See MX2008 AC Power Requirements to calculate maximum power, which is dependent on configuration and temperature.

Calculating DC Power Requirements for MX2008 Routers

Note

The MX2008, MX2010, and MX2020 routers support the same power modules (AC/DC PSMs and AC/DC PDMs.

The information in this topic helps you determine which PSMs are suitable for various configurations, as well as which PSMs are not suitable because output power is exceeded. You determine suitability by subtracting the total power draw from the maximum output of the PSMs. Afterward, you calculate the required input current. Finally, you calculate the thermal output. A sample configuration is provided in Table 3.

We recommend that you provision power according to the maximum input current listed in the power system electrical specifications (see MX2008 DC Power (-48 V) System Electrical Specifications and DC Power (240 V China) Circuit Breaker Requirements for the MX2000 Router).

Use the following procedures to calculate the power requirement:

  1. Calculate the power requirement.
  2. Evaluate the power budget.
  3. Calculate input power.
  4. Calculate thermal output (BTUs) for cooling requirements.DC Power (240 V China) Circuit Breaker Requirements for the MX2000 Router.

The MX2008 DC power system provides power to the FRUs in the chassis (see Table 3 for information about power). Each power system is made up of two DC PDMs, nine PSMs, ten MPCs, two fan trays, eight SFBs, and two RCBs.

When calculating power requirements, be sure that there is adequate power for the system.

Table 3: MX2008 DC Power System Sample Configuration

Chassis Power Configuration

Power Distribution Modules (PDMs)

Power Supply Modules (PSMs)

Description

2 PSMs, 2 RCBs, 8 SFBs, and 2 fan trays (no line cards installed)

PDM 0 and 1

2 PSMs

The power consumed by RCBs and SFBs is 100 W each.

The power consumed by 2 RCBs and 8 SFBs is 1 KW.

The power consumed by fan trays 0 and 1 is 1.5 KW each.

The total Kilowatts of power consumed is 4.0 KW.

10 Line cards

PDM 0 and 1

5 PSMs

Each line card consumes up to 1 KW. One PSM is needed for every set of 2 line cards.

N+1 redundant system with N+N redundancy for SFBs, RCBs, and 1 out of 2 fan trays.

PDM 0 and 1

9 PSMs

This provides N+N redundnacy for critical FRUs (RCBs, SFBs, and fan trays) and N+1 redundancy for line cards.

  1. Calculate the power requirements (usage) using the values in MX2008 DC Power Requirements as shown in Table 4.

    Table 4: Typical DC Power Requirements for MX2008 Router

    Component

    Model Number

    Power Requirement (Watts) with 91% Efficiency

    Base chassis

    CHAS-MX2008-BB

    Fan trays

    MX2000-FANTRAY-BB

    1500 * 2 W = 3000 W

    MPC

    MPC-3D-16XGE-SFPP

    440 W * 10 = 4400 W

    ADC

    ADC

    150 W * 10 = 1500 W

    RCB

    REMX2008-X8-64G

    100 W * 2 = 200 W

    SFB—slots 0 through 7

    MX2008-SFB2

    100 W * 8 = 800 W

    MX2000 DC power system ( 60 A feeds to each PDM input)

    MX2000 DC power system ( 80 A feeds to each PDM input)

    2100 W * 8 PSMs=16,800 W (+ 1 PSM@2100 W redundant capacity)

    2500 W * 8 PSMs=20,000 W (+ 1 PSM@2500 W redundant capacity)

  2. Evaluate the power budget, including the budget for each configuration if applicable, and check the required power against the maximum output power of available PDM options.

    Table 5 lists the PSMs, their maximum output power, and unused power (or a power deficit).

    Table 5: Calculating DC Power Budget

    Power Supply Module

    Maximum Output Power of Power Supply Module (Watt)

    Maximum Output Power for System (Watt)—Including Redundant Capacity

    MX2000 DC PSM 60 A (feed to each input)

    2100

    18,900

    MX2000 DC PSM 80 A or DC PSM (240 V China) (feed to each input)

    2500

    22,500

  3. Calculate input power. Divide the total output requirement by the efficiency of the PSM as shown in Table 6.

    Table 6: Calculating DC Input Power

    Power Supply Module

    Power Supply Module Efficiency

    Output Power Requirement (Watt)—per PSM

    Input Power Requirement (Watt)—per PSM

    MX2000 DC PSM 60 A

    91%

    2100

    2307

    MX2000 DC PSM 80 A or DC PSM (240 V China)

    91%

    2500

    2747

  4. Calculate thermal output (BTUs). Multiply the input power requirement (in watts) by 3.41 as shown in Table 7.

    Table 7: Calculating DC Thermal Output

    Power Distribution Module

    Thermal Output (BTUs per hour)

    MX2000 DC PDM

    34.5 KW divided by 0.91 * 3.41 = 129,280 BTU/hr.

    34.5 KW of output power consumed by the chassis. This is the maximum output the chassis can consume in a redundant configuration. The input power is 16.5 divided by 0.91 = 37.9 KW.

Calculating High-Voltage Second-Generation Universal Power Requirements for MX2008 Routers

Note

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

The information in this topic helps you determine which PSMs are suitable for various configurations, as well as which PSMs are not suitable because output power is exceeded. You determine suitability by subtracting the total power draw from the maximum output of the PSMs. Afterward, you calculate the required input current. Finally, you calculate the thermal output. A sample configuration is provided in Table 8.

We recommend that you provision power according to the maximum input current listed in the power system electrical specifications (see MX2000 Router High-Voltage Universal (HVAC/HVDC) Power Subsystem Electrical Specifications and High-Voltage Universal (HVAC/HVDC) Power Circuit Breaker Requirements for the MX2000 Router).

Use the following procedures to calculate the power requirement:

  1. Calculate the power requirement.
  2. Evaluate the power budget.
  3. Calculate input power.
  4. Calculate thermal output (BTUs) for cooling requirements. High-Voltage Universal (HVAC/HVDC) Power Circuit Breaker Requirements for the MX2000 Router.

The MX2008 DC power system provides power to the FRUs in the chassis (seeTable 8 for information about power). Each power system is made up of two DC PDMs, nine PSMs, ten MPCs, two fan trays, eight SFBs, and two RCBs.

When calculating power requirements, be sure that there is adequate power for the system.

Table 8: MX2008 Power System Sample Configuration

Chassis Power Configuration

Power Distribution Modules (PDMs)

Power Supply Modules (PSMs)

Description

2 PSMs, 2 RCBs, 8 SFBs, and 2 fan trays (no line cards installed)

PDM 0 and 1

2 PSMs

The power consumed by RCBs and SFBs is 100 W each.

The power consumed by 2 RCBs and 8 SFBs is 1 KW.

The power consumed by fan trays 0 and 1 is 1.5 KW each.

The total Kilowatts of power consumed is 4.0 KW.

10 Line cards

PDM 0 and 1

5 PSMs

Each line card consumes up to 1 KW. One PSM is needed for every set of 2 line cards.

N+1 redundant system with N+N redundancy for SFBs, RCBs, and 1 out of 2 fan trays.

PDM 0 and 1

9 PSMs

This provides N+N redundnacy for critical FRUs (RCBs, SFBs, and fan trays) and N+1 redundancy for line cards.

  1. Calculate the power requirements (usage) using the values in MX2008 High-Voltage Second-Generation Universal Power Requirements as shown in Table 9.

    Table 9: Typical HVAC/HVDC Power Requirements for MX2008 Router

    Component

    Model Number

    Power Requirement (Watts) with 91% Efficiency

    Base chassis

    CHAS-MX2008-BB

    Fan trays

    MX2000-FANTRAY-BB

    1500 * 2 W = 3000 W

    MPC

    MPC-3D-16XGE-SFPP

    440 W * 10 = 4400 W

    ADC

    ADC

    150 W * 10 = 1500 W

    RCB

    REMX2008-X8-64G

    100 W * 2 = 200 W

    SFB—slots 0 through 7

    MX2008-SFB2

    100 W * 8 = 800 W

    MX2010 HVAC/HVDC power system (upper and lower half of chassis, 19 A feeds to each PDM input)

    3000 W * 8 PSMs=24,000 W (+ 1 PSM@3000 W redundant capacity)

  2. Evaluate the power budget, including the budget for each configuration if applicable, and check the required power against the maximum output power of available PDM options.

    Table 10 lists the PSMs, their maximum output power, and unused power (or a power deficit).

    Table 10: Calculating HVAC/HVDC Power Budget

    Power Supply Module

    Maximum Output Power of Power Supply Module (Watt)

    Maximum Output Power for System (Watt)—Including Redundant Capacity

    MX2008 Universal (HVAC/HVDC) PSM

    3000 W for single feed

    3400 W for dual feed

    3000 * 8 PSM = 24,000 W (single feed)

    3400 * 8 PSM = 27,200 W (dual feed)

  3. Calculate input power. Divide the total output requirement by the efficiency of the PSM as shown in Table 11.

    Table 11: Calculating HVAC/HVDC Input Power

    Power Supply Module

    Power Supply Module Efficiency

    Input Power Requirement (Watt)—per PSM

    MX2008 Universal (HVAC/HVDC) PSM

    91%

    3300 W for single feed, 3800 W for dual feed

  4. Calculate thermal output (BTUs). Multiply the input power requirement (in watts) by 3.41 as shown in Table 12.

    Table 12: Calculating HVAC/HVDC Input Power

    Loaded Chassis Heat Load

    Thermal Output (BTUs per hour)

    Loaded chassis configuration

    34.5 KW divided by 0.91 * 3.41 = 129,280 BTU/hr.

    34.5 KW of output power consumed by the chassis. This is the maximum output the chassis can consume in a redundant configuration. The input power is 16.5 divided by 0.91 = 37.9 KW.