
CX900e Hardware Reference Manual
3-4
3006M100-002
3.1.3
Power Section
The power connector module delivers 110/220 VAC (nominal) from the powe
line to the primary coil of a step-down transformer. A secondary coil supplies 14
VAC through P2 to the motherboard’s on-board power supply. This power supply
pr5 VDC regulated for the CPU and logic. It also pr5 VDC for
the I/O cards which it delivers via the system bus. Finally, it pr15 VDC
and -15 VDC unregulated for use by the -48V/Ring Generator card for the Voice I/
O card(s), if mounted.
A 4 Amp time-delay fuse located at F1 and a crow-bar circuit protect the
electronics (the motherboard and I/O cards) from power regulator malfunctions.
A -48V/Ring Generator card is installed at J2 to power the Voice I/O cards, if
installed.
Figure 3-3 Motherboard’s I/O Section
Figure 3-4 Power Section
Summary of Contents for CX900e
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