Adaptec AHA-2920 Manual de usuario descargar pdf (Pagina 4)

General SCSI Specifications

Bus Width SCSI Standard

Maximum

Speed

Maximum

Length

Common Connectors

8-bit

(Narrow)

SCSI-1 5 MB/s

(19.6 ft.)

Ribbon IDC 50

Internal 50-pin connector for hard drives, CD drives, etc.

Centronics 50

Popular 50-contact connector for external peripherals such as scanners

and tape drives.

DB25

External 25-pin connector used by Zip drives, scanners, and many Mac

devices.

DB50

External 50-pin connector used by Sun workstations.

SCSI-2

Fast SCSI,

Fast-10

10 MB/s

(9.8 ft.)

Ribbon IDC 50

Internal 50-pin connector for hard drives, CD drives, etc.

Half Pitch DB50

External 50-pin host and peripheral connector used by Jaz drives and

many CD drives.

Ultra SCSI,

Fast-20

20 MB/s

1.5m

(4.9 ft.)

Ultra2 SCSI 40 MB/s

12m

(39 ft.)

16-bit

(Wide)

SCSI-2,

Fast Wide

SCSI,

Fast-10

20 MB/s

1.5m

(4.9 ft.)

Half Pitch DB68

Internal and external 68-pin connector used by most new hard drives. The

external version includes thumbscrews or latches.

Ultra Wide

SCSI,

Fast-20

40 MB/s

1.5m

(4.9 ft.)

SCSI-3,

Ultra2 Wide

(U2W) SCSI,

Ultra2 LVD

SCSI,

Fast-40

80 MB/s

12m

(39 ft.)

Half Pitch DB68

Low Voltage Differential (LVD) cables and accessories are required to

achieve peak performance with U2W drives.

Very High Density Centronics 68

68-pin contact connector used on many servers & RAID controllers.

SCA 80

80-contact connector used by SCA drives for RAID controllers

Ultra3 SCSI,

Ultra160/m

160 MB/s

12m

(39 ft.)

* Maximum SCSI bus length is 25m (82ft.) if all devices are HVD (Differential)

What is SCSI?

General SCSI Specifications

What is an SCA / RAID connector?

Types of SCSI Signals

Rules for Connecting SCSI Devices

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