Adaptec 29320LPE SCSI Card Uživatelská příručka stáhnout pdf (Strana 21)

Chapter 4: Understanding SCSI ● 21

The following figure shows SCSI devices connected to the external connector.

Maximum Cable Lengths

The total length of cabling (internal and external) on the SCSI bus cannot exceed the

maximum lengths listed in the following table. The third column lists the maximum number

of SCSI devices you can connect to the SCSI card.

Terminated Device

Maximum Cable Length Data Transfer Rate

Maximum Devices

Supported

25 m (82.0 ft) Ultra320 SCSI (320 MB/sec)

Ultra160 SCSI (160 MB/sec)

Ultra2 SCSI (80 MB/sec)

12 m (39.4 ft)

Ultra320 SCSI (320 MB/sec)

Ultra160 SCSI (160 MB/sec)

Ultra2 SCSI (80 MB/sec)

Mixing Fast/Ultra devices with Ultra320/Ultra160 and Ultra2 SCSI devices causes the entire SCSI bus to default to

Ultra SCSI speeds and cable length requirements.

3 m (9.8 ft) Fast Wide SCSI (20 MB/sec) 15

3 m (9.8 ft) Fast SCSI (10 MB/sec) 7

3 m (9.8 ft) Ultra SCSI (40 MB/sec for 16-bit, 20 MB/sec for

8-bit)

1.5 m (4.9 ft) Ultra SCSI (40 MB/sec for 16-bit, 20 MB/sec for

8-bit)

5-7

Ultra SCSI data transfer rates do not currently support more than seven devices connected to the SCSI card due to

cable lengths.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 65 66

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Adaptec 29320LPE SCSI Card Uživatelská příručka Strana 21