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# T320 Power Requirements

Table 1 lists the power requirements for various hardware components when the router is operating under typical voltage conditions. For PIC power requirements, see the T320 Core Router PIC Guide.

Table 1: Component Power Requirements

Component

Current Requirement (Amps @ –48 VDC)

Base system, not including FPCs and PICs (includes three SIBs, one host subsystem, one SCG, two power supplies, cooling system, and craft interface

9 A

SIB

0.8 A

Type 1 FPC (without PICs)

3.3 A

Type 2 FPC (without PICs)

3.3 A

Type 3 FPC (without PICs)

3.3 A

Host subsystem (Routing Engine and control board)

2.6 A

SCG

0.2 A

Power supply

0.8 A

Cooling system (normal speed)

1.7 A

Cooling system (full speed)

4.5 A

• Power consumption for minimum configuration:

Base System + 1 FPC3 + 2 PICs =
9 A + 3.3 A + 2(0.625) A = 13.6 A @ –48 VDC = 653 W
• Power consumption for maximum configuration:

Base System + 8 FPC3 + 1 Host + 1 SCG + 16 PICs =
9 A + 8(3.3 A) + 2.6 A + 0.2 A + 16(0.625 A) =
9 A + 26.4 A + 2.6 A + 0.2 A + 10 A = 48.2 A @ –48 VDC = 2,314 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 – 1.7 A + 4.5 A = X A + 2.8 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 48.2
X = 48 x 48.2/54 = 42.8 A
• System thermal output for maximally configured router:

Watts DC/0.293 = BTU/hr
2314/0.293 = 7,898 BTU/hr