IBM 8649 Hardware Maintenance Manual - Page 82

Universal, Serial, connectors

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Your server has an integrated SCSI controller with RAID capabilities. This dual-channel controller supports two independent, Ultra320 SCSI channels. The SCSI connectors for both channels are on the system board. Each channel supports up to 15 SCSI devices. This controller uses: v Double-transition clocking to achieve up to 320 MB-per-second data-transfer rates v Domain name validation to negotiate compatible data-transfer speeds with each device v Cyclic-redundancy checking (CRC), instead of the usual parity checking, to improve data reliability v An active terminator for SCSI bus termination 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. 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. SCSI cabling requirements You can install four internal SCSI devices using the SCSI signal cable that comes with some server models. If you plan to attach external SCSI devices, you must order an additional SCSI cable, remove the SCSI knockout from the rear of the server, and connect the new cable from 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. When using an optional SCSI adapter, you must also connect the SCSI adapter to the SCSI LED (J18) connector on the system board receive an indication of SCSI hard-disk drive activity. See "System-board internal connectors" on page 91 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/ on the World Wide Web. Adhering to these standards will help to ensure that your server operates properly. Universal Serial Bus connectors Use a Universal Serial Bus (USB) connector to connect a USB device. USB technology transfers data at up to 12 Mb per second (Mbps) with a maximum of 127 devices and a maximum signal distance of 5 meters (16 ft) per segment. 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. 72 IBM xSeries 225 Types 8649: Hardware Maintenance Manual and Troubleshooting Guide

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Your
server
has
an
integrated
SCSI
controller
with
RAID
capabilities.
This
dual-channel
controller
supports
two
independent,
Ultra320
SCSI
channels.
The
SCSI
connectors
for
both
channels
are
on
the
system
board.
Each
channel
supports
up
to
15
SCSI
devices.
This
controller
uses:
v
Double-transition
clocking
to
achieve
up
to
320
MB-per-second
data-transfer
rates
v
Domain
name
validation
to
negotiate
compatible
data-transfer
speeds
with
each
device
v
Cyclic-redundancy
checking
(CRC),
instead
of
the
usual
parity
checking,
to
improve
data
reliability
v
An
active
terminator
for
SCSI
bus
termination
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.
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.
SCSI
cabling
requirements
You
can
install
four
internal
SCSI
devices
using
the
SCSI
signal
cable
that
comes
with
some
server
models.
If
you
plan
to
attach
external
SCSI
devices,
you
must
order
an
additional
SCSI
cable,
remove
the
SCSI
knockout
from
the
rear
of
the
server,
and
connect
the
new
cable
from
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.
When
using
an
optional
SCSI
adapter,
you
must
also
connect
the
SCSI
adapter
to
the
SCSI
LED
(J18)
connector
on
the
system
board
receive
an
indication
of
SCSI
hard-disk
drive
activity.
See
“System-board
internal
connectors”
on
page
91
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
on
the
World
Wide
Web.
Adhering
to
these
standards
will
help
to
ensure
that
your
server
operates
properly.
Universal
Serial
Bus
connectors
Use
a
Universal
Serial
Bus
(USB)
connector
to
connect
a
USB
device.
USB
technology
transfers
data
at
up
to
12
Mb
per
second
(Mbps)
with
a
maximum
of
127
devices
and
a
maximum
signal
distance
of
5
meters
(16
ft)
per
segment.
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.
72
IBM
xSeries
225
Types
8649:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide