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IBM PS/2 Model 90 XP 486 and 95 XP 486 HMR
Terminators
3.4 Terminators
Even though the system can appear to be operating correctly with or
without terminators installed, it is not actually operating correctly.
The SCSI bus can operate at data rates up to 5MB per second.
Because of
the high speed, the bus must be terminated properly, at both ends, with
resistors (terminators) or you eventually will have problems.
If you do not terminate the SCSI bus correctly, you can experience
intermittent errors.
For example, if a terminator is missing, the result
might be poor signal quality or improper (higher) voltages.
Intermittent
errors can lead to solid failures if the SCSI devices are exposed to
continuous excessive voltages.
If you have too many terminators installed, for example, three internal
hard disk drives, each with a terminator, the result might be a drop in
voltages to a point where devices will not operate, or they operate
intermittently.
Subtopics
3.4.1 SCSI Device Cabling and Terminators
3.4.2 SCSI Adapter Terminators
¦ Copyright IBM Corp. 1990, 1992
3.4 - 1
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