VME Expansion
Module
Test
Points
The backplanes
have
test points for all
power
supply
outputs. The test points
are
plated
through
holes
with
silk screen labeling. They are accessible
when
the
front bezel is
removed
from the module.
Battery
Backup
and
Cooling
5 V
STBY
has
been
interconnected
between
backplanes. This allows the design
of
a VME
battery
module
to
supply
5 V
STBY
to the total system bus.
Cooling sensors for the VME Expansion
Module
are
on
the backplane. The
analog
output
of
the cooling sensor
runs
in
the backplane to the
I/0
distribution board.
Termination
One
VME
bus
terminator is integral
with
the
CPU
backplane.
The
second
terminator is a
separate
board
that
plugs
onto the
two
4
row
140 receptacle
contact connectors
that
are
always
at
the
end
of the bus. The backplane uses
proprietary
termination. This
improves
the noise
immunity
of VME control
signals. The
VME backplane
has
DIP ICs to
perform
the daisy chain
jumpering
and
active termination.
Power Supply
One
maximum
payload
enclosure requires a 15
amp
115 volt service
or
the VA
equivalent
at
other voltages.
It
is
rated
at
12
amps
at
115 volts. This
rating
is
on
the Base. The result is
that
the total enclosure
payload
is limited to 585
watts
of DC power. Payloads
in
the
system
are limited to the specification of the
power
supply
in
each
module,
to
the
rating
of
the
module,
and
to the
rating
for
the enclosure.
Cooling
Cooling is
provided
by
fans
that
are
part
of the
power
supply
unit.
VME Terminator
3-2
The VME terminator is contained
in
the
base
assembly.
It
"moves"
with
the
base
assembly as VME expansion
modules
are
added
to a system
stack
Reference
Guide
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