v
Domain
name
validation
to
negotiate
compatible
data-transfer
speeds
with
each
device
v
Cyclic-redundancy
checking
(CRC)
to
improve
data
reliability
v
An
active
terminator
for
SCSI
bus
termination
The
following
illustration
shows
a
SCSI
connector.
34
1
68
35
SCSI
cabling
requirements
You
can
install
four
internal
SCSI
devices
using
the
SCSI
signal
cable
that
comes
with
some
computer
models.
If
you
plan
to
attach
external
SCSI
devices,
you
can
order
an
additional
SCSI
cable,
remove
the
SCSI
knockout
from
the
rear
of
the
computer,
and
connect
the
new
cable
from
the
SCSI
channel
B
connector
on
the
system
board
to
this
opening.
To
select
and
order
the
correct
cables
for
use
with
external
devices,
contact
your
IBM
reseller
or
IBM
marketing
representative.
See
“System-board
internal
connectors”
on
page
36
for
the
locations
of
the
SCSI
connectors.
If
you
want
to
attach
external
SCSI
devices
to
the
computer
without
using
the
internal
SCSI
channel
B,
you
must
install
an
optional
SCSI
adapter.
Setting
SCSI
IDs
Each
SCSI
device
that
is
connected
to
a
SCSI
controller
must
have
a
unique
SCSI
ID.
This
ID
enables
the
SCSI
controller
to
identify
the
device
and
ensure
that
different
devices
on
the
same
SCSI
channel
do
not
attempt
to
transfer
data
simultaneously.
SCSI
devices
that
are
connected
to
different
SCSI
channels
can
have
duplicate
SCSI
IDs.
See
the
information
that
comes
with
the
device
for
instructions
for
setting
its
SCSI
ID.
Universal
Serial
Bus
connectors
There
are
five
Universal
Serial
Bus
(USB)
2.0
connectors,
two
on
the
front
and
three
on
the
rear
of
the
computer.
Use
the
USB
connectors
to
connect
optional
telephony
and
multimedia
devices.
USB
2.0
technology
transfers
data
at
up
to
480
Mb
per
second
(Mbps)
with
a
maximum
of
127
external
devices
and
a
maximum
signal
distance
of
5
meters
(16
ft)
per
segment
(if
the
device
that
is
attached
to
the
computer
is
a
USB
2.0
device).
If
multiple
USB
devices
are
attached
to
the
computer,
the
USB
hub
must
be
USB
2.0;
otherwise,
all
USB
2.0
devices
will
transfer
data
at
12
Mbps.
Using
Plug
and
Play
technology,
USB
devices
are
configured
automatically.
The
following
illustration
shows
a
USB
connector.
1
4
Use
a
4-pin
USB
cable
to
connect
an
external
devices
to
a
USB
connector.
If
you
connect
a
PS/2
(non-USB)
keyboard
to
the
keyboard
connector,
USB
ports
and
devices
are
disabled
during
power-on
self-test
(POST).
If
you
connect
a
USB
keyboard
that
has
a
mouse
port,
the
keyboard
emulates
a
mouse,
and
you
cannot
disable
the
mouse
settings
in
the
Configuration/Setup
Utility
program.
68
IntelliStation
A
Pro
Type
6224:
User’s
Guide
Summary of Contents for IntelliStation A Pro 6224
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