Adaptec 1520A - AHA Storage Controller Fast SCSI 10 MBps Dokumentacja Pobierz pdf (Strona 98)

Page 90 DocSTAR Level 2 Service Training Workbook

Appendix A: SCSI Interfaces

Names Max

Speed

(MB/s)

No. of

Devices

(A,B)

Max Total

Length of

Cable

External Connector Types Comments

SCSI-1 SCSI-1 5 8 6m

50-pin low-density

(SCSI-1, Centronix, A-Cable)

Many

peripherals

are

available.

Fast SCSI 10 8

50-pin low-density

(SCSI-1, Centronix, A-Cable)

50-pin high-density (SCSI-2)

SCSI-2

Fast Wide SCSI 20 16

Up to 4

devices

3m:

5 or more

devices

1.5m

68-pin

Backward-

compatible

w/SCSI-1.

“Wide”

products

use 16-bit

instead of

8-bit data

paths.

Ultra SCSI 20 8 1.5m

D, LVD

Ultra2 SCSI

40 8 12m

Ultra3 SCSI 80 8 12m

50-pin low-density

(SCSI-1, Centronix, A-Cable)

50-pin high-density (SCSI-2)

Ultra Wide SCSI 40 16 1.5m

D, LVD

Ultra2 Wide

SCSI

80 16 12m

SCSI-3

Ultra3 Wide

SCSI

160 16 12m

68-pin

Backward

compatible

w/SCSI-1 &

SCSI-2.

“Wide”

products

use 16-bit

instead of

8-bit data

paths.

(A): Including Host Adapter.

(B): Per channel.

(D): Differential allows for cable lengths up to 25 meters.

(LVD): Low Voltage Differential allows for cable lengths up to 12 meters.

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