Table 30: Dc-Powered Base Router Power Requirements; Table 31: Component Power Requirements - Juniper MX240 Hardware Manual

MX240 Ethernet Services Router Hardware Guide
power supply configurations. The base DC-powered router includes the midplane,
craft interface, and fan tray running at normal speed.

Table 30: DC-Powered Base Router Power Requirements

Table 31 on page 168 lists the power requirements for various hardware components
when the router is operating under typical voltage conditions.

Table 31: Component Power Requirements

These examples use generalized values for DPCs. For DPC power requirements, see
the MX-series Ethernet Services Router DPC Guide.
Typical power consumption for DC-powered routers:
168
DC Power Specifications and Requirements
DC Power Supply Configuration
One DC power supply (nonredundant configuration)
Two DC power supplies (redundant configuration)
Component
SCB
Routing Engine
Fan tray (full speed) – Fan tray (normal
speed)
DPC—Generalized typical value
DPC—Generalized maximum value
Minimum DC-powered configuration:
Base router (with fan tray at normal speed and one power supply) + 1 SCB + 1
Routing Engine + 1 DPC =
1.04 A +3.1 A + 1.9 A + 6.5 A = 12.5 A @ 48 VDC = 600.0 W DC
Maximum DC-powered configuration with one host subsystem and a third DPC
in the multifunction slot:
Base router and two power supplies + fan tray at full speed + 1 SCB + 1 Routing
Engine + 3 DPCs
Power
Requirement
(Watts)
50 W
(approximate)
66 W
(approximate)
Power Requirement (Watts)
150 W
90 W
70 W – 50 W = 20 W
312 W
365 W
Current
Requirement
(Amps @
–48 VDC)
1.04 A
(approximate)
1.38 A
(approximate)
Current
Requirement
(Amps @
–48 VDC)
3.1 A
1.9 A
0.4 A
6.5 A
7.6 A