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I/O Interface Card
Channel 0
Channel 1
JP3 and JP4
Fault Bus Protocol
Jumpers (Add to
disable termination)
Channel 0 and 1
Term Power Jumpers
Cables
Cable length is another consideration when configuring
the subsystems.
When considering the total length of your cabling
requirements, the internal length of cables and printed
circuit board traces (known as the internal cable
length) must be subtracted from your total cable
length. The DEU internal cable length is 36 inches.
For Ultra Wide SCSI, the total SCSI cable length is 3
meters (118 inches) with four drives and 1.5 meters (59
inches) with eight drives. After subtracting the
internal length of 36 inches the remaining cable length
is 82 inches or approximately 6.83 feet (2.08 meters) for
four drives and 23 inches or approximately 1.9 feet (.58
meters) for eight drives.
Because of the enhancements in the DEU, its possible
to extend beyond the limits set forth in the
specification. However, a symptom from exceeding this
cable limit is a SCSI bus lockup or “freeze.” If you
experience a similar problem and are aware of a
cabling limit issue, reducing the length of cabling and
returning the total length to within the specified limit
should resolve any problems.
If you have a cabling issue and require more
information, contact Technical Support for further
assistance. Data loss is possible under conditions of
SCSI bus lockup.
