System Overview
1-7
Pin Assignments for the DC Power Connectors
The power-supply output voltages can be measured at the back (wire side) of
the connectors without disconnecting them. Figures 1-6 through 1-8 show the
wire side of the connectors.
1
Pin 11 — PSON# should measure b4 and +5 VDC except when the power button
on the front panel is pressed, taking PSON# to its active-low state.
2
Pin 19 — Thermal fan-speed control (TFSC) is a power-supply input signal used to control
the power-supply fan speed.
3
Pin 5 — PWRGOOD should measure b4 and +5 VDC when the power supply is
on to indicate that all power-supply output voltages are within the ranges specified in
Table 1-1.
Figure 1-6. DC Power Connector P1
Figure 1-7. DC Power Connector P2
11
1
PWRGOOD
3
(orange)
–12 VDC (blue)
+12 VDC (yellow)
+5 VFP (purple)
common (black)
2
3
4
5
6
7
8
9
10
12 13
14 15 16 17
18 19
20
P1
+5 VDC (red)
+5 VDC (red)
+5 VDC (red)
+5 VDC (red)
+5 VDC (red)
+5 VDC (red)
common (black)
common (black)
common (black)
PSON#
1
(grey)
common (black)
common (black)
common (black)
open
TFSC
2
(brown)
1
2
3
4
+3.3 VDC (blue/white)
common (black)
common (black)
5
P2
6
+3.3 VDC (blue/white)
+3.3 VDC (blue/white)
common (black)
