IBM 84885BU User Manual - Page 75

Serial, connectors, Ultra320, connector

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Serial connectors Use the serial connectors to connect serial devices. The following illustration shows a serial connector. 1 5 6 9 Ultra320 SCSI connector You can install up to four internal SCSI devices in some models of the server. These models come with one SCSI cable that is connected from the internal SCSI connector to the standard hot-swap-drive backplane. You can attach additional internal SCSI devices to the other internal SCSI connector, or you can use the connector to attach external SCSI devices. To connect external SCSI devices, remove the SCSI knockout from the rear of the server and secure the free end of an optional cable in the new opening. If you want to attach external SCSI devices to the server without using the internal SCSI channel, you must install an optional SCSI adapter. Notes: 1. External SCSI devices connected to internal SCSI channel will operate asynchronously. 2. If you install a PCI RAID adapter to configure and manage the internal hot-swap drives, you must move the SCSI cable from the system-board SCSI connector to an internal channel connector on the RAID adapter (see "Cabling an optional SCSI adapter" on page 54). An optional external SCSI connector might be installed on the rear of the server. Use this connector to connect external SCSI devices. The following illustration shows a SCSI standard 68-pin, female D-shell SCSI connector. 34 1 68 35 The server has a dual-channel SCSI controller. This dual-channel controller supports two independent, Ultra320 SCSI channels that support up to 15 SCSI devices each. The SCSI connectors for the channels are on the system board. The controller has the following features: v Double-transition clocking to achieve up to 320 MBps (megabytes per second) data-transfer rates 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 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. Chapter 4. Customer replacement units 65

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Serial
connectors
Use
the
serial
connectors
to
connect
serial
devices.
The
following
illustration
shows
a
serial
connector.
1
5
6
9
Ultra320
SCSI
connector
You
can
install
up
to
four
internal
SCSI
devices
in
some
models
of
the
server.
These
models
come
with
one
SCSI
cable
that
is
connected
from
the
internal
SCSI
connector
to
the
standard
hot-swap-drive
backplane.
You
can
attach
additional
internal
SCSI
devices
to
the
other
internal
SCSI
connector,
or
you
can
use
the
connector
to
attach
external
SCSI
devices.
To
connect
external
SCSI
devices,
remove
the
SCSI
knockout
from
the
rear
of
the
server
and
secure
the
free
end
of
an
optional
cable
in
the
new
opening.
If
you
want
to
attach
external
SCSI
devices
to
the
server
without
using
the
internal
SCSI
channel,
you
must
install
an
optional
SCSI
adapter.
Notes:
1.
External
SCSI
devices
connected
to
internal
SCSI
channel
will
operate
asynchronously.
2.
If
you
install
a
PCI
RAID
adapter
to
configure
and
manage
the
internal
hot-swap
drives,
you
must
move
the
SCSI
cable
from
the
system-board
SCSI
connector
to
an
internal
channel
connector
on
the
RAID
adapter
(see
“Cabling
an
optional
SCSI
adapter”
on
page
54).
An
optional
external
SCSI
connector
might
be
installed
on
the
rear
of
the
server.
Use
this
connector
to
connect
external
SCSI
devices.
The
following
illustration
shows
a
SCSI
standard
68-pin,
female
D-shell
SCSI
connector.
34
1
68
35
The
server
has
a
dual-channel
SCSI
controller.
This
dual-channel
controller
supports
two
independent,
Ultra320
SCSI
channels
that
support
up
to
15
SCSI
devices
each.
The
SCSI
connectors
for
the
channels
are
on
the
system
board.
The
controller
has
the
following
features:
v
Double-transition
clocking
to
achieve
up
to
320
MBps
(megabytes
per
second)
data-transfer
rates
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
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.
Chapter
4.
Customer
replacement
units
65