Barracuda 36 Installation Guide, Rev. B

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Table 4b. Cable characteristics for differential I/O circuits

 

Maximum distance between

 

terminators (meters) [1] [3]

 

 

 

 

 

Interconnect

Fast-5

Fast-10

Fast-20

Fast-40

 

 

 

 

 

Point-to-point interconnect

 

 

 

 

(2 devices)

25

25

25

25 [2]

 

 

 

 

 

Daisy-chain interconnect

 

 

 

 

(up to 16 devices) [4]

15

15

15

12

 

 

 

 

 

[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]SCSI devices shall be within a stub length of the termination (.1 meter).

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

[4]Loads spaced at least eight inches (20.3 cm) apart (cables). (Refer to SCSI EPI T10/1143D specification.)

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Seagate ST136475LW/LC manual Cable characteristics for differential I/O circuits