Seagate BARRACUDA 36 ST136475LW/LC User Manual

Page 26

Barracuda 36 Installation Guide, Rev. B

[1] For environments where all elements of the bus (cables, device inter-

faces, environmental noise and other parameters) are controlled to
be better than minimally required, it may be possible to extend the
path length and device count.

[2] Extending the device count beyond eight requires specification con-

trol beyond the minimum specified in the ANSI T10/1142D docu-
ment. It is recommended that the devices be uniformly spaced
between terminators with the end devices located as close as possi-
ble to the terminators.

[3] Values specified by data rate shall apply even if a slower data rate is

negotiated.

Table 4a.

Cable characteristics for single-ended I/O
circuits

Number of attached SCSI
devices

Maximum distance between
terminators (meters) [1] [3]

Fast-5 Fast-10 Fast-20 Fast-40

1 to 4 maximum capacitance
(25 pF) SCSI devices

N/A

5 to 8 maximum capacitance
(25 pF) SCSI devices

1.5

N/A

9 to 16 maximum capacitance
(25 pF) SCSI devices

[2]

N/A