Dell 3 User Manual
Page 28
26
Over view
w
w
w
.d
e
ll
.co
m
|
s
u
p
p
o
rt
.d
e
ll.c
o
m
PERC 3/SC has one ultra-high-density 68-pin external connector for the
external storage subsystem and one high-density 68-pin internal connector.
Single-Ended and LVD SCSI Buses
The SCSI standard defines two electrical buses: a single-ended bus and an
LVD bus. PERC 3 supports both standards.
Maximum Cable Length for SCSI Standards
Table 1-1 displays the maximum length of cable that you can use for various
SCSI standards.
SCSI Bus Widths and Maximum Throughput
Table 1-2 displays the SCSI bus widths and maximum throughput for each
of the SCSI standards.
Ta b l e 1 - 1 . M a x i m u m C a b l e L e n g t h f o r S C S I S t a n d a r d s
SCSI Standard
Single-ended
LVD
Maximum # of
Drives
SCSI I
6 m
12 m
7
Fast SCSI
6 m
12 m
7
Fast Wide SCSI
6 m
12 m
15
Ultra SCSI
1.5 m
12 m
7
Ultra SCSI
3 m
12 m
3
Wide Ultra SCSI
N/A
12 m
15
Wide Ultra SCSI
1.5 m
12 m
7
Wide Ultra SCSI
3 m
12 m
3
Ultra 2 SCSI
N/A
25 m
1
Ultra 2 SCSI
N/A
12 m
7
Wide Ultra 2 SCSI
N/A
25 m
1
Wide Ultra 2 SCSI
N/A
12 m
15