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.
The
hot-swap-drive
backplane
controls
the
SCSI
IDs
for
the
internal
hot-swap
drive
bays.
However,
when
you
attach
an
external
SCSI
device
to
an
optional
SCSI
adapter,
you
must
set
a
unique
ID
for
the
device.
See
the
information
that
comes
with
the
device
for
instructions
to
set
its
SCSI
ID.
You
can
attach
external
SCSI
devices
using
an
optional
SCSI
adapter.
To
select
and
order
the
correct
adapter
for
use
with
external
devices,
contact
your
IBM
marketing
representative
or
authorized
reseller.
When
using
an
optional
SCSI
adapter,
you
must
also
connect
the
SCSI
adapter
to
the
SCSI
LED
connector
on
the
system
board
to
receive
an
indication
of
SCSI
hard
disk
drive
activity.
Note:
On
server
models
that
support
SATA
hard
disk
drives,
you
can
attach
only
an
external
SCSI
tape
drive
to
an
optional
SCSI
adapter.
See
“System-board
internal
connectors”
on
page
3
for
the
location
of
the
SCSI
connectors.
For
information
about
the
maximum
length
of
SCSI
cable,
see
the
American
National
Standards
Institute
(ANSI)
SCSI
standards
on
the
ANSI
Web
site
at
http://www.ansi.org/.
Adhering
to
these
standards
will
help
to
ensure
that
your
server
operates
correctly.
Universal
Serial
Bus
connectors
Use
a
Universal
Serial
Bus
(USB)
2.0
connector
to
connect
a
USB
device.
USB
2.0
technology
transfers
data
at
up
to
480
Mb
per
second
(Mbps)
with
a
maximum
of
127
devices
and
a
maximum
signal
distance
of
5
meters
(16
ft)
per
segment
(if
the
device
that
is
attached
to
the
server
is
a
USB
2.0
device).
If
multiple
USB
devices
are
attached
to
the
server,
the
USB
hub
must
be
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
cable
to
connect
a
device
to
a
USB
connector.
If
you
need
to
connect
more
USB
devices
than
the
server
has
USB
connectors
for,
use
a
USB
hub
to
connect
additional
devices.
If
you
connect
a
PS/2
(non-USB)
keyboard
to
the
keyboard
connector,
USB
ports
and
devices
are
disabled
during
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.
48
xSeries
226
Type
8648:
Option
Installation
Guide
Summary of Contents for eServer xSeries 226Type 8648
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