Parallel SCSI: Difference between revisions

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Standards: Symbol diagram
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==Standards==
[[File:SCSI symbols.svg|thumb|upright=0.9|Diagrams of different Parallel SCSI symbols (single-ended, low-voltage differential, low-voltage differential/single-ended multi-mode, high-voltage differential)<ref>{{cite book | last=Jernigan | first=Elton | date=2002 | url=https://books.google.com/books?id=GkEBejuiTt4C&pg=PA171 | title=Server+ Certification: Training Guide | publisher=Que | page=171 | isbn=9780735710870 | via=Google Books}}</ref>|alt=single-ended, low-voltage differential, low-voltage differential/single-ended multi-mode, high-voltage differential]]
 
Parallel SCSI is not a single standard, but a suite of closely related standards. There are a dozen SCSI interface names, most with ambiguous wording (like Fast SCSI, Fast Wide SCSI, Ultra SCSI, and Ultra Wide SCSI); three SCSI standards, each of which has a collection of modular, optional features; several different connector types; and three different types of voltage signaling. The leading SCSI card manufacturer, [[Adaptec]], has manufactured over 100 varieties of SCSI cards over the years. In actual practice, many experienced technicians simply refer to SCSI devices by their bus bandwidth (i.e., SCSI 320 or SCSI 160) in Megabytes per second.