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[ The PC Guide | Systems and Components Reference Guide | Hard Disk Drives | Hard Disk Interfaces and Configuration | Small Computer Systems Interface (SCSI) | SCSI Data Transfer Modes and Feature Sets ] Wide Ultra SCSI Description: Wide Ultra SCSI refers to devices that use 20 MHz SCSI bus speed on a wide, 16-bit bus, allowing for throughput of up to 40 MB/s. This is sometimes called Fast-20 Wide SCSI in reference to the Fast-20 signaling specification that defines Ultra SCSI speed. It is also sometimes called Ultra Wide SCSI. Defining Standard: SCSI-3 / SPI (including Fast-20 addendum). Special Features: None. Bus Width: Wide (16-bit). Signaling Method: SE or HVD. Signaling Speed and Bus Throughput: 20 MHz bus speed; 40 MB/s. Number of Devices Supported: 16 if HVD signaling is used; 8 if SE signaling is used with a maximum cable length of 1.5m; 4 if SE signaling is used with a cable length of over 1.5m. Termination: For SE, either active or forced perfect termination. For HVD, HVD termination. Cabling and Maximum Cable Length: "P" cable (68 pins). Maximum of 3m for SE if no more than 4 devices are used, otherwise 1.5m; 25m for HVD.
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