User`s manual
CBI-1010
Installing SCSI Devices
This section details installing devices from the connectors of
the
back panel
adapter
kit to the SCSI
devices~
Read carefully the subsections, "Cable
Specifications"
and
"SCSI ID for Target Devices" before installing the devices.
Cable Specifications
Single-ended
and
differential cable specifications vary; see the appropriate
paragraph
below for cable specifications before attempting to install devices.
See page 2-6 for a discussion of cabling issues
in
systems
running
at
high
transfer rates.
Single-ended:
•
When
the
CBI-IOIO
and
the SCSI devices are installed
in
the same cabinet
that
meets EMI/RFI shielding requirements, a 25-conductor twisted
pair
ca-
ble
must
be
used
for connecting
the
CBI-IOIO
(JE)
and
the SCSI devices.
•
When
the
CBI-IOIO
and
the SCSI devices are installed
in
separate cabinets,
a shielded twisted pair cable
must
be
used
to meet FCC requirements.
• A
minimum
conductor size of 2S-AWG
must
be
used
to minimize noise
effects
and
ensure
proper
distribution of optional terminator power.
• The maximum cable length is
3.0
meters
or
9.9 feet
in
single-ended
mode
at
10
megabytes
per
second.
Differential:
•
When
the
CBI-IOIO
and
the SCSI devices are installed
in
the same cabinet
that meets EMI/RFI shielding requirements, a 25-conductor twisted
pair
ca-
ble
must
be
used
for connecting
the
CBI-IOIO
(JE)
and
the SCSI devices.
•
When
the
CBI-IOIO
and
the SCSI devices are installed
in
separated cabi-
nets, a shielded twisted pair cable
must
be
used
to connect the SCSI de-
vices from the back panel
adapter
kit meeting FCC requirements. Other-
wise, crosstalk between adjacent signals causing spurious pulses
on
differ-
ential signals will occurs
even
at
slow data transfer rates
and
short cable
distances. Each
pair
should be connected to the same signal, one wire to
the positive signal,
and
the other wire to
the
negative.
• Cables should consist of conductors of 26-AWG
or
2S-AWG.
• The
maximum
cable length is
25
meters
or
SO
feet
in
differential mode.
SCSI
10
for Target Devices
Each SCSI device (initiator
or
target)
on
the SCSI bus requires a
unique
SCSI
ID number. Since the
CBI-IOIO
has
been
set to
SCSI
ID 7 (initiator), target
3-14 Installation