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SCSI
SCSI is an acronym for "Small Computer System Interface" (pronounced "scuzzy") and it is the bus standard for professional computer systems.
It is a bus standard first defined by ANSI as SCSI in 1986.
By now, SCSI has passed through a series of development stages. These developments were primarily related to speed, the number of devices that can be connected and transmission security.
SCSI device connections require a plug-in card and one cable that uses one plug to connect all of the devices to each other.
This plug-in card is known as a host adapter and always has the SCSI ID 7. Such an ID number is unique to one SCSI cable: Every device must have its own ID number that is used to access it.
As previously mentioned, by now there are many standards, which are briefly listed below:
| Name | Maximum cable length
(in m) | Maximum speed
(in MB/s) | Maximum number of devices | | SCSI-1 | 6 | 5 | 8 | | SCSI-2 | 6 | 5-10 | 8/16 | | Fast SCSI-2 | 3 | 10-20 | 8 | | Wide SCSI-2 | 3 | 20 | 16 | | Fast Wide SCSI-2 | 3 | 20 | 16 | | Ultra SCSI-3 (8-bit) | 1.5 | 20 | 8 | | Ultra SCSI-3 (16-bit) | 1.5 | 40 | 16 | | Ultra-2 SCSI | 12 | 40 | 8 | | Wide Ultra-2 SCSI | 12 | 80 | 16 |
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Today, the most commonly used successful standard is Ultra-2 SCSI LVD.
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