Juniper T4000 Hardware Manual page 363

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Copyright © 2013, Juniper Networks, Inc.
Table 48: Typical DC Power Requirements for T4000 Components
(continued)
Component
Cooling system with FAN-R-TXP-3D-LCC rear fan tray (normal speed)
Cooling system with FAN-R-TXP-3D-LCC rear fan tray (full speed)
Craft interface
PIC—Generalized typical value
PIC—Generalized maximum value
Example of calculating power consumption for a minimum configuration:
Base System + 1 Type 4 FPC + 1 PIC
30.8 A + 11.3 A + 0.625 A = 42.7 A @ –48 VDC = 2050 W
Example of calculating power consumption for a maximum configuration with eight
FPCs:
Base System + 1 LCC-CB + 1 RE-C1800 + 1 SCG + 8 T1600-Type 4 FPCs + 16 PICs +
(cooling system full speed - normal speed)
30.8 A + 1.0 A + 1.7 A + 0.2 A + 8 (11.3 A) + 16 (3.3 A) + (23.6 A - 8.2 A)
30.8 A + 1.0 A + 1.7 A + 0.2 A + A + 90.4 A + 52.8 A + 15.4 A = 192.3 A @ –48 VDC = 9230
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
Example of calculating typical system thermal output for a configuration:
Watts DC/0.293 = BTU/hr
9230 W/0.293 = 31,501 BTU/hr
T4000 DC Power System Electrical Specifications on page 336
Overview of Preparing the Site for the T4000 Router on page 57
T4000 DC Power Distribution on page 343
T4000 Power System Description on page 43
Appendix D: Power Guidelines, Requirements, and Specifications
Current
Requirement
(Amps @
–48 VDC)
9.5 A
26.7 A
0.2 A
0.625 A
3.3 A
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