Technical Documentation
T640 AC 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 11,765 W per each three-phase delta AC power supply or 11,775 W per each three-phase wye AC power supply.
If you do not plan to provision 11,765 W per each three-phase
delta AC power supply or 11,775 W per each three-phase wye AC power
supply, you can use the information in Table 1, Table 2 and the T640 Core Router PIC Guide 
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 an AC-powered router.
Table 1 lists the
power requirements for various hardware components when the router is
operating under typical voltage conditions. For power requirements
for specific PICs, see the.T640 Core Router PIC Guide
Table 1: T640 Base AC Power Requirments
Component | Power Requirement (Watts) |
|---|---|
Base system, not including FPCs and PICs (includes five SIBs, one host subsystem (T-CB and 600, 1600, or 2000 Routing Engine ), one SCG, cooling system at normal speed, and craft interface), and two AC power supplies | 954 W |
Table 2: Typical AC Power Requirements for T640 Components
Component | Power Requirement (Watts) | Power Requirement (Watts) with 85% Efficiency |
|---|---|---|
SIB: Standard SIB, standard SIB version B, or T640-SIB | 38 W | 44 W |
Enhanced II FPC1 | 163.2 W | 192 W |
Enhanced Scaling FPC1 | 340.8 W | 401 W |
FPC2 and Enhanced II FPC2 | 163.2 W | 192 W |
FPC3 and Enhanced II FPC3 | 326.4 W | 384 W |
Enhanced Scaling FPC3 | 437.28 W | 514 W |
T640 Enhanced Scaling FPC4 | 393.6 W | 463 W |
Host subsystem (600, 1600, or 2000 Routing Engine and T-CB) | 124.8 W | 147 W |
SCG | 9.6 W | 11 W |
Redundant backup three-phase delta AC power supply | Not applicable | 91 W |
Redundant backup three-phase wye AC power supply | Not applicable | 91 W |
Cooling system (full speed – normal speed) | 1056 W — 321.6 W = 734.4 W | 864 W |
Craft interface | 9.6 W | 11 W |
PIC —Generalized typical value | 30 W | 35 W |
PIC (Type 3)—Generalized maximum value | 57.6 W | 68 W |
PIC (Type 4)—Generalized maximum value | 158.4 W | 186 W |
- Example of calculating typical power consumption for minimum
configuration:Base System + 1 FPC3 + 1 PIC =954 W + 384 W + 35 W= 2193 W
- Example of calculating typical power consumption for maximum
configuration:Base System +8 Enhanced Scaling FPC3 + 1 Host subsystem + 1 SCG + 32 PICs + fan tray (full speed – normal speed) =954 W + 8 (514 W) + 147 W + 11 W + 32 (68 W) + 864 W =954 W + 4112 W + 147 W + 11 W + 2176 W + 864 W = 8264 W
- Example of calculating system thermal output:Watts DC/0.293 = BTU/hr8264/0.293 = 28,205 BTU/hr
