Juniper T640 Hardware Manual page 163

Table 72: T640 Component DC Power Requirements (continued)
Component
Type 4 FPC
T640 Enhanced Scaling FPC4-1P
Host subsystem (Routing Engine and control board)
SCG
Power supply
Cooling system (normal speed)
Cooling system (full speed)
Craft interface
PIC—Generalized typical value
PIC (Type 3)—Generalized maximum value
PIC (Type 4)—Generalized maximum value
Copyright © 2017, Juniper Networks, Inc.
These examples use generalized values for PICs. For PIC power requirements, see the
T640 Core Router Interface Module Reference.
Example of calculating power consumption for a minimum configuration under typical
voltage conditions:
Base System + 1 FPC3 + 1 PIC =
16.9 A + 6.8 A + 0.625 A = 24.3 A @ –48 VDC = 1,166 W
Example of calculating power consumption for a maximum configuration under typical
voltage conditions:
Base System + 8 Enhanced Scaling FPC3 + 1 Host + 1 SCG + 32 PICs =
16.9 A + 8(9.1 A) + 2.6 A + 0.2 A + 32(1.2 A) =
16.9 A + 72.8 A + 2.6 A + 0.2 A + 38.4 A = 130.9 A @ –48 VDC = 6283 W
Current requirement adjustment for fans running at full speed (high temperature
environment or cooling component failure):
Calculated system current (X) – Cooling (normal) + Cooling (full speed) =
X A – 6.7 A + 22 A = X A + 15.3 A
Input current from a DC source other than –48 VDC (based on maximum configuration):
(–54 VDC input) x (input current X) = (–48 VDC) x (input current Y)
54 x X = 48 x 94.1 A
X = 48 x 94.1 A/54 = 83.6 A
Chapter 10: DC Power Requirements and Specifications
Current Requirement
(Amps @ –48 VDC)
8.2 A
7.0 A
2.6 A
0.2 A
1.7 A
6.7 A
22 A
0.2 A
0.625 A
1.2 A
3.3 A
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