HOWTEK 4500 Drum Scanner SCSI Recommendations?

[Melnick Studios Inc.]

What's the longest SCSI cable allowed for these scanners?

[onnect17]

I use 10' cables from Monoprice without any issues but here's the answer according to ADAPTEC.

The maximum total length (internal plus external cables) is determined by the number of devices on the controller and the maximum desired bandwidth.

A longer total cable length limits the maximum bandwidth due to attenuation, impedance of the devices, and propagation delay of the signals.

Here is a rule of thumb for maximum cable length:

SCSI-1 (5MB/Sec) 6 meters (<=18ft)
SCSI-2 (5MB/Sec) 6 meters (<=18ft)
SCSI-2 fast (10MB/Sec) 3 meters (<=9 ft)
SCSI-2 fast/wide, ULTRA (20MB/Sec) 3 meters (<=9 ft)
SCSI-2 ULTRA Wide (40MB/Sec) 1.5 meters (> 4 devices)
SCSI-2 ULTRA Wide (40MB/Sec) 3 meters (< 4 devices)
SCSI-3 ULTRA2 Wide (80MB/Sec) 12 meters (> 2 devices)
SCSI-3 Ultra 160 (160MB/Sec) 12 meters (> 2 devices)
SCSI-3 Ultra 320 (320MB/Sec) 12 meters (> 2 devices)

[fishbulb]

The Aztek setup guide recommends 10 feet (3 m) or less. The 4500 Users Guide recommends 19 feet (5.8 m) or less in the entire SCSI daisy chain.