Juniper T4000 Hardware Manual page 128

T4000 Core Router Hardware Guide
98
Table 65: Typical DC Power Requirements for T4000 Components (continued)
Component
C1800 Routing Engine
SCG
Redundant backup six-input DC power supply
Cooling system with FAN-REAR-TXP-LCC (normal speed)
Cooling system with FAN-REAR-TXP-LCC (full speed)
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
Current
Requirement
(Amps @
–48 VDC)
1.7 A
0.2 A
5.2 A
8.2 A
23.6 A
9.5 A
26.7 A
0.2 A
0.625 A
3.3 A
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