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Installation

Manual No. 771971 3-15

Cable Lengths

Generally speaking, as SCSI data transfer rates increase, maximum

allowable cable lengths decrease. Transfer rates of 5 MB/sec for 8-bit SCSI

or 10 MB/sec for 16-bit SCSI will normally allow a 6 meter (20 foot)

maximum cable length on a channel. Transfer rates of 40 MB/sec for 16-bit

Ultra SCSI permit a maximum cable length of only 1.5 meters, if more than

4 devices are on the channel.

☛

Note

Strict adherence to guidelines for over-all cable length

is necessary when connecting Ultra-SCSI drives that

will operate at the higher data transfer rates of the

Fast-20 standard (refer to ANSI STD X3.131 for

information on SCSI cabling requirements).

Table 3-3. Supported SCSI Formats and Cable Lengths

* 50-pin to 68-pin adapter required

† 3 meters with up to 4 SCSI devices or 1.5 meters with more than 4 SCSI devices

SCSI Type Clock Rate Data Rate Connector Cable Length

Ultra-SCSI

(16-bit)

20 Mhz 40MB/sec 68-pin 3m (10 ft)†

Ultra-SCSI

(8-bit)

20 Mhz 20MB/sec 68-pin or

50-pin*

3m (10 ft)†

Wide SCSI-2

(16-bit)

10 Mhz

5 Mhz

20 MB/sec

10 MB/sec

68-pin 3 m (10 ft)

6 m (20 ft)

Narrow SCSI-2

(8-bit)

10 Mhz

5 Mhz

10 MB/sec

5 MB/sec

68-pin or

50-pin*

3 m (10 ft)

6 m (20 ft)

SCSI-1 (8-bit) 5 Mhz 5 MB/sec 50-pin* 6 m (20 ft)

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 105 106

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Mylex DAC960PG Guida di Installazione Pagina 63

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