JP3 and JP4 Fault Bus Protocol Jumpers (Add to disable termination)
Channel 0
Channel 1
I/O Interface Card
Cab les
Channel 0 and 1 Term Power Jumpers
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.
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