SCSI switch

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SCSI switch

A device that cross connects computers to SCSI devices and overcomes certain SCSI limitations. The regular SCSI interface is a shared bus architecture, but a SCSI switch provides the full bandwidth between any two devices, greatly increasing overall throughput. This is the same concept as shared Ethernet versus an Ethernet switch.

SCSI switches also double the cable distance between devices and minimize access contention, because the devices are not subject to a priority by their ID numbers. In addition, the 7-device or 15-device limit gives way to any number of devices, because the switches can be cascaded. See SCSI.

Shared Vs. Switched
Switched SCSI eliminates many limitations, including bandwidth, cable distance and number of devices. The switch has a backplane capable of handling the full SCSI bandwidth at each of its ports.

Extending the Limitations
GigaLabs pioneered the SCSI switch, but later went out of business. This JigSaw 8-slot model provided 16 non-blocking ports between SCSI devices. (Image courtesy of GigaLabs, Inc.)
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The rack mount version of the SCSI SWITCH can be installed in a standard 19 inch (EIA unit) rack.
In addition, up to thirty two (32) SCSI SWITCH racks can be cascaded together and controlled from one computer, offering a selection of up to 224 SCSI devices.
The SCSI SWITCH supports 10 MBytes/sec and 20 MBytes/sec FAST SCSI devices on 8-bit (narrow) and 16-bit (wide) versions respectfully.