SDB:SCSI: Basics
Types of SCSI Cards
| Type | Frequency | Connector | Transfer rate | Terminator | Cable length |
|---|---|---|---|---|---|
| SCSI 1 | 5 MHz | 50 pin / 8 bit bus width or Centronics |
max. 5 MB/sec | passive terminator (SE - single ended) |
<= 3 m max. length |
|
Examples of this card type
| |||||
| Fast SCSI | up to 10 MHz | 50 pin / 8 bit bus width |
max. 10 MB/sec | active terminator recommended passive terminator partly poss. (SE) |
<= 3 m max. length |
|
Example of this card type
| |||||
| Wide SCSI | up to 10 MHz | 68 pin / 16 bit bus width |
max. 20 MB/sec | active terminator recommended passive partly poss. (SE) |
<=3 m max. length |
| Ultra SCSI/SCSI 2 | up to 20 MHz | 50 pin / 8 bit bus width |
max. 20 MB/sec | active terminator required (SE) |
? |
| Ultra Wide | up to 20 MHz | 68 pin / 16 bit bus width |
max. 40 MB/sec | active terminator (SE) |
<= 1.5 m max. length >= 20 cm between devices |
| Ultra 2 Wide | up to 40 MHz | 68 pin / 16 bit bus width |
max. 80 MB/sec | active terminator (LVD terminator - Low Voltage Differential) external terminator absolutely required |
<=12 m max. length >= 20 cm between devices |
<keyword>SCSI,UW,U2W,Wide,UltraWide,MHz,Fast,bus</keyword>