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Installing the A4800A Adapter
Connecting SCSI Peripheral Devices
Chapter 2 25
Connecting SCSI Peripheral Devices
Connect multiple SCSI devices by chaining them together with shielded,
68-pin, High-Density (HD) cables. The connectors on these cables are
keyed to ensure proper pin-1 to pin-1 registration. Refer to the
peripheral manual for instructions on attaching SCSI cables. Peripheral
storage devices are normally shipped with the required SCSI cables.
Table 2-3 below shows the SCSI bus widths and speeds that have been
established by the SCSI Trade Association (STA).
You can connect up to eight SCSI, Fast SCSI, and Ultra SCSI devices on
a single-ended Ultra SCSI bus if they are evenly spaced on a 1.5 m Ultra
2 SCSI cable (0.19 m between devices).
Table 2-3 SCSI Bus Widths and Speeds
Type
(1)
SCSI Bus
Width (in Bits)
SCSI Bus Speed
Maximum Data
Rate (in
MBytes/Second)
SCSI-1 8 5
Fast SCSI 8 10
Fast Wide SCSI 16 20
Ultra SCSI 8 20
Wide Ultra SCSI 16 40
Ultra2 SCSI 8 40
Wide Ultra2
SCSI
16 80
(1)
Absence of the word “Wide” means an 8-bit bus width;
using the term “Narrow” to avoid ambiguity is acceptable,
too.