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Hardware Specifications and Features
If both SE and LVD devices are attached to the same channel/bus, the entire bus must
operate at the single ended mode speed of the slower device. See
maximum cable length distances that apply to each mode.
Table 3-3. Supported SCSI Device Standards
SCSI Drive
Standard
(2)
SCSI-1
Fast SCSI
Fast Wide SCSI
Ultra SCSI
Ultra SCSI
Wide Ultra SCSI
Wide Ultra SCSI
Wide Ultra SCSI
Ultra 2 SCSI
Wide Ultra 2
Ultra160 (Ultra 3)
Ultra320
Notes:
(1) May be exceeded in Point-to-Point and engineered specific applications.
(2) Use of the word "Narrow", preceding SCSI, Ultra SCSI, or Ultra2 SCSI (i.e. Narrow SCSI) is op-
tional.
(3) LVD was not defined in the original SCSI standards for this speed. If all devices on the bus sup-
port LVD, then 12-meters operation is possible at this speed. However, if any device on the bus is
singled-ended only, then the entire bus switches to single-ended mode and the distances in the sin-
gle-ended column apply.
(4) Single-ended is not defined for speeds beyond Ultra.
After Ultra 2 all new speeds are wide only.
The preceding information is based on the 'STA-Endorsed Terms & Terminology for SCSI
Parallel Interface Technology' specification published by the SCSI Trade Association. It
can be viewed at:
24
Bus Speed
(MB/Sec)
5
(2)
10
20
(2)
20
(2)
20
40
40
40
(2, 4)
40
(4)
80
160
320
http://www.scsita.org/terms/scsiterms.html
Maximum Cable
Length (meters)
Bus Width
(in Bits)
Single-
Ended
8
6
8
3
16
3
8
1.5
8
3
16
N/A
16
1.5
16
3
(4)
8
(4)
16
16
(4)
16
(4)
Hardware Installation and User's Guide
Table 3-3
for the
(1)
Maximum Devices
per SCSI Channel
LVD
(3)
8
(3)
8
(3)
16
(3)
8
N/A
4
(3)
16
N/A
8
N/A
4
12
8
12
16
12
16
12
16
.
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