Table 27: Component DC Power Requirements (continued)
48V Input Power Requirement at 80%
Power Supply EfficiencyPower Requirement (Watts)Component
80 W64 WNPC
44 W35 WSCM
65 W52 WNP-IOC
50 W40 WIOC (max)
65 W52 WIOC (min)
Use the information in Table 26 on page 87 and Table 27 on page 87 to calculate power consumption for
various hardware configurations, input current from a different source voltage, and thermal output, as
shown in the following examples. These examples use maximum values per IOC.
Typical power consumption for DC-powered services gateways:
•
Minimum DC-powered configuration:
Base services gateway (nonredundant) + 1 SPC + 1 NPC =
375 W + 148 W + 80W = 603 W @ -48 VDC = 12.6 A
•
Maximum DC-powered configuration:
Base services gateway (redundant) + 7 SPCs + 3 NPCs + 2 IOC (max) + 1 SCM =
375 W + 7(148) W + 3(80) W + 2(65) W + 44 W =
375 W + 1036 W + 240 W + 130 W + 44 W = 1825 W @ -48 VDC = 38.0 A
•
Input current from a DC source other than -48 VDC (based on maximum configuration; applies to DC
power supply only):
(–54 VDC input) * (input current X) = (-48 VDC input) * (input current Y)
54 * X = 48 * 38.0 A
X = (48 *38.0)/54 = 33.8 A
•
Thermal output for maximally configured DC-powered services gateway:
Watts DC * 3.41= BTU/hr
1825 * 3.41 = 6223 BTU/hr
88
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