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Table A: SCSI Bus Width and Maximum Data Rates

Bus Width (bits)
Maximum Data Transfer Rate (MBytes/sec)
SCSI-1
8
5
Fast SCSI
8
10
Wide SCSI
16
10
Fast Wide SCSI
16
20
Ultra SCSI
8
20
Wide Ultra SCSI
16
40
Ultra2 SCSI
8
40
Wide Ultra2 SCSI
16
80

Table B: SCSI Maximum Bus Length and Device Addressing.

SCSI Type
Single Ended (meters)
Differential (meters)
LVD (meters)
Number of Nodes
SCSI-1
6
25
12
8
Fast SCSI
3
25
12
8
Fast Wide SCSI
3
25
12
16
Ultra SCSI
1.5
25
12
8
Wide Ultra SCSI
-
25
12
16
Wide Ultra SCSI
1.5 or 3
-
-
8 or 4
Ultra2 SCSI
not defined
not defined
12
8
Wide Ultra2 SCSI
not defined
not defined
12
16

Table C: Cable Lengths Meters and Feet
SCSI Type Maximum Cable Length
Single Ended - SCSI 1, Fast Narrow 6 Meters / 19.7 Feet
Single Ended - Fast Wide 3 Meters* / 9.8 Feet
Ultra - Narrow, Wide 1.5 Meters / 4.9 Feet
Differential (All types) 25 Meters / 82 Feet
Low Voltage Differential - LVD (All types) 12 Meters / 39.4 Feet

Table D: SCSI Technologies: Comparison of Maximums:

Data Transfer Rate (MBytes/sec)
Number of Nodes
Bus Length (meters)
SCSI-1
5
8
25
Fast SCSI
10
8
25
Wide Fast
20
16
25
Ultra SCSI
20
8
12
Wide Ultra SCSI
40
18
12
P1394
12.5
63
248
SSA
40 - 80
127
600
Fibre Channel
100
128
>1000

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