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T4000 DC Power Requirements

 

To allow for future growth so that you can operate the router in any hardware configuration without upgrading the power infrastructure, we recommend that you provision 56 A @ –48 VDC per input for the 60-A DC power cables connected to each power supply.

Table 1 lists the power requirements for various hardware components when the router is operating under typical voltage conditions.

You can use the information in Table 1 and the PIC requirements in T4000 Core Router Interface Module Reference to calculate power consumption for various hardware configurations, input current from a different source voltage, and thermal output, as shown in the following examples for a DC-powered router.

Table 1: Typical DC Power Requirements for T4000 Components

Component

Current Requirement (Amps @ –48 VDC)

Base system, not including FPCs and PICs (includes five SIB-I-T4000 SIBs, one host subsystem, one SCG, cooling system at normal speed, and craft interface) and two power supplies

30.8 A

Base system, not including FPCs and PICs (includes five TXP-LCC-3D SIBs, one host subsystem, one SCG, cooling system with FAN-R-TXP-3D-LCC rear fan tray at normal speed, and craft interface) and two power supplies

31.0 A

SIB-I-T4000 SIB

4.7 A

TXP-LCC-3D SIB

4.2 A

T1600 Enhanced Scaling FPC4

11.3 A

T4000 FPC5

13.6 A

Line-card chassis control board (LCC-CB)

1.0 A

C1800 Routing Engine

1.7 A

SCG

0.2 A

Redundant backup six-input DC power supply

5.2 A

Cooling system with FAN-REAR-TXP-LCC (normal speed)

8.2 A

Cooling system with FAN-REAR-TXP-LCC (full speed)

23.6 A

Cooling system with FAN-R-TXP-3D-LCC rear fan tray (normal speed)

9.5 A

Cooling system with FAN-R-TXP-3D-LCC rear fan tray (full speed)

26.7 A

Craft interface

0.2 A

PIC—Generalized typical value

0.625 A

PIC—Generalized maximum value

3.3 A

  • Example of calculating power consumption for a minimum configuration:

  • Example of calculating power consumption for a maximum configuration with eight FPCs:

  • Current requirement adjustment for fans running at full speed (high temperature environment or cooling component failure):

  • Input current from a DC source other than –48 VDC (based on maximum configuration):

  • Example of calculating typical system thermal output for a configuration: