Power Consumption for a DC-Powered MX480 Router
 | Note: If you plan to operate a maximally configured DC-powered router, we recommend that you provision 58 A (32 A per feed) @ –48 VDC for the system. For high capacity power supplies, we recommend that you provision 60 A or 75A per feed, depending on the selected DIP switch setting. |
If you do not plan to provision 58 A (32 A per feed) @ –48 VDC for the systemf you do not plan to provision based on these recommendations, you can use the information , you can use the information in Table 1 and Table 2 to calculate the power consumption @ –48 VDC, and thermal output for various hardware configurations.
Table 1 lists the power requirements for base DC-powered routers operating under typical voltage conditions.
Table 1: DC Base Router Power Requirements
DC Power Supply Configuration | Power Requirement (Watts) | Current Requirement (Amps @ –48 VDC) |
|---|---|---|
Nonredundant configuration includes two DC power supplies, midplane, craft interface, and the fan tray (running at normal speed) | 135 W (approximate) | 2.8 A (approximate) |
Redundant configuration includes four DC power supplies, midplane, craft interface, and the fan tray (running at normal speed) | 180 W (approximate) | 3.8 A (approximate) |
| High-Capacity Power Supplies | ||
Nonredundant configuration includes two high-capacity DC power supplies, midplane, craft interface, and the high-capacity fan tray (running at normal speed) | 135 W (approximate) | 2.8 A (approximate) |
Redundant configuration includes four high-capacity DC power supplies, midplane, craft interface, and the high-capacity fan tray (running at normal speed) | 180 W (approximate) | 3.8 A (approximate) |
Table 2 lists the power requirements for various hardware components when the router is operating under typical voltage conditions.
For exact DPC, MPC, MIC, and PIC power requirements, see the MX Series 3D Universal Edge Routers Line Card Guide.
Table 2: Component Power Requirements
Component | Power Requirement (Watts) | Current Requirement (Amps @ –48 VDC) |
|---|---|---|
Fan tray (full speed) – Fan tray (normal speed) | 110 W – 80 W =30 W | 0.6 A |
High-capacity fan tray | 160 W | 3.3 A |
SCB | 150 W | 3.1 A |
Routing Engine | 90 W | 1.9 A |
DPC—Generalized typical value | 312 W | 6.5 A |
DPC—Generalized maximum value | 365 W | 7.6 A |
FPC2 (without PICs) | 110 W | 2.3 A |
FPC3 (without PICs) | 180 W | 3.8 A |
MPC (fixed configuration) | 440 W | 9.17 A |
MPC (without MICs) | 294 W | 6.13 A |
Use the information in Table 1 and Table 2 to calculate power consumption for various hardware configurations, input current from a different source voltage, and thermal output, as shown in the following examples. These examples use generalized values per DPC. For exact DPC, MPC, MIC, and PIC power requirements, see the MX Series 3D Universal Edge Routers Line Card Guide. Typical power consumption for DC-powered routers:
- Minimum DC-powered configuration:Base router (nonredundant) + 1 SCB + 1 Routing Engine + 1 DPC—Generalized typical value =2.8 A + 3.1 A + 1.9 A + 6.5 A = 14.3 A @ –48 VDC = 686 W DC
- Maximum DC-powered configuration:Base router (redundant) + fan tray at full speed + 2 SCBs + 2 Routing Engines + 6 DPCs—Generalized maximum value =3.8 A + 0.6 A + 2(3.1) A + 2(1.9) A + 6(7.6 A) = 3.8 A + 0.6 A + 6.2 A + 3.8 A + 45.6 A = 60 A @ –48 VDC = 2880 W DC
- Input current from a DC source other than –48 VDC
(based on maximum configuration; applies to DC power supply only):(–54 VDC input) * (input current X) = (–48 VDC input) * (input current Y)54 * X = 48 * 60 AX = (48 * 60 A)/54 = 53 A
- Thermal output for maximally configured DC-powered router:Watts DC * 3.41= BTU/hr2880 W * 3.41 = 9821 BTU/hr
