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Is the spacing of connectors on a SCSI cable important?

April 26, 2017cable connectors SCSI spacing

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Is the spacing of connectors on a SCSI cable important?

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ANSWER From: Gary Field (gfield@grcelect.ultranet.com) The ANSI SCSI spec’s say that “stubs” on a SCSI bus must not be any more than .1 meters (4 in.) long. In the most recent spec’s there are also guidelines that say you shouldn’t place “stubs” any closer than .3 meters (12 in.) apart. Since each device attached acts as a “stub”, you really shouldn’t place connectors any closer than this. This get to be more important as your bus performance goes up. i.e. with Fast20 is is very important, but with SCSI1 it doesn’t really matter much. Since Fast20 also limits your overall bus length to 1.5 meters (for single ended) this also means you shouldn’t really connect more than 5 devices for best reliability.