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# 1  
Old 04-22-2003
query about scsi
can any one tell me what's the difference between scsi and differential scsi?
# 2  
Old 04-22-2003
http://isc.faqs.org/faqs/scsi-faq/part1/

it is very long, use your browsers find function and search for differential in the page.
# 3  
Old 04-22-2003
On a single-ended SCSI bus, devices communicate over one set of wires. Information is interpreted by the voltage (signal strength) on the wire, and is somewhat more susceptible to electrical noice which could cause voltage fluctuations and corrupted data.

On a differential SCSI bus, devices communicate over two sets of wires. The information is interpreted by the difference in voltage between the wires. Outside noise will affect both wires equally, so the impact of noise on signal quality is diminished.

* Single-ended communication is fast over short distances. For SCSI-1, the maximum distance was 6 meters. For Fast SCSI (a SCSI-2 option), the recommended maximum distance is 3 meters (9.84 feet). (So keep your external SCSI cable lengths reasonably short.)

* For differential, the maximum distance goes up to 25 meters.
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