54
Technical Product Specification
Power Subsystem
4.9
Midplane Power Distribution
The ZT 5085's power distribution architecture includes dual power domains, multiple V(I/O)
domains, and ORed management power to central resources.
illustrates power
distribution on the midplane.
4.9.1
V(I/O) Segmentation
The ZT 5085's midplane provides five independent V(I/O) planes: one for each of the two
CompactPCI segments and one for each of the two fabric slots, and one for the pair of PCI-less
slots. Each V(I/O) plane can be independently strapped for either 3.3 V or 5 V V(I/O). Refer to
Section 2.4.3, “Setting V(I/O)” on page 29
for information on configuring the different V(I/O)
levels.
Table 9. DC Input Specifications
Parameter
Conditions/Description
MIN
NOM
MAX
Units
Input Voltage –DC
Continuous input range.
36
75
VDC
Hold-up Time
From 48 VDC Input.
4
ms
Input Current
At full rated load; 36 VDC, 48VDC
7.6, 5.4
A
Input Protection
Non-user serviceable, internally-located input
line fuse
Inrush Surge Current
Internally limited by thermistor and electronic
switch.
12
A
Operating Frequency
Switching frequency of main output
transformer
125
145
KHz
Input Transient
Protection
Varistor
Figure 24. ZT 5085 Midplane Power Distribution
Backplane
(3.3V, 5V, 12V, and -12V)
H.110 Power Buses
V(I/O)A
Fabric
A Slot
V(I/O)B
PCI Segment 1
V(I/O)C
PCI Segment 2
V(I/O)E
Fabric
B Slot
V(I/O)D
PCI-Less
Slots
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