Table 72: T640 Component DC Power Requirements (continued)
Current Requirement
(Amps @ –48 VDC)Component
8.2 AType 4 FPC
7.0 AT640 Enhanced Scaling FPC4-1P
2.6 AHost subsystem (Routing Engine and control board)
0.2 ASCG
1.7 APower supply
6.7 ACooling system (normal speed)
22 ACooling system (full speed)
0.2 ACraft interface
0.625 APIC—Generalized typical value
1.2 APIC (Type 3)—Generalized maximum value
3.3 APIC (Type 4)—Generalized maximum value
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
129Copyright © 2017, Juniper Networks, Inc.
Chapter 10: DC Power Requirements and Specifications
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