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What is SCSI Small Computer System Interface ?

Publish:

2022-08-29 17:20

Source:

www.premier-cable.net

What is SCSI Small Computer System Interface ?

Small Computer System Interface ( English: Small Computer System Interface; abbreviated: SCSI) , an independent processor standard for system-level interfaces between computers and smart devices (hard disks , floppy drives , optical drives , printers , scanners , etc.).

It is an intelligent general-purpose interface standard that has the ability to communicate with many types of peripherals. SCSI uses the standard software interface of ASPI (Advanced SCSI Programming Interface) to enable the drive to communicate with the SCSI adapter installed inside the computer.

SCSI interface is widely used in high-speed data transmission technology on minicomputers. The SCSI interface has the advantages of wide application range , multitasking , large bandwidth , low CPU occupancy , and hot plugging.

A host adapter and eight SCSI peripheral controllers can be connected to the SCSI bus , and the peripherals can include disks , tapes , CD-ROMs , rewritable CD-ROM drives , printers , scanners , and communication devices.

SCSI is a multitasking interface with bus arbitration. Multiple peripherals attached to a SCSI bus can work simultaneously. Devices on SCSI occupy the bus equally.

The SCSI interface can transmit data synchronously or asynchronously , the synchronous transmission rate can reach 10MB/s , and the asynchronous transmission rate can reach 1.5MB/s.

There are two types of SCSI connectors: built-in and external.

The appearance of the built-in data cable is the same as that of the IDE data cable , but the number of pins and specifications are slightly different. It is mainly used to connect the optical drive and the hard disk. The 40-pin IDE cable has 40 wires , the 40-pin ATA66 has 80 wires , and the SCSI built-in has 40 wires. 50 stitches , 68 stitches and 80 stitches.

As for the SCSI external data cable , there are the following specifications , and their densities are not the same , don't make a mistake.

Low-Density , 50-pin , Male External

Low-Density , 50-pin , Female External

High-Density , 50-pin , Male External

High-Density , 50-pin , Female External

Low-Density , 50-pin , Male Internal

Low-Density , 50-pin , Female Internal

High-Density , 68-pin , Male External

High-Density , 68-pin , Female External

High-Density , 68-pin , Male Internal

High-Density , 68-pin , Female Internal

VHDCI , 68-pin , Male External

VHDCI , 68-pin , Female External

MDR Cable 14 Pin to 26 Pin

MDR 50 Pin Cable Connector

SCSI cable VHDCI to HPDB50