Seagate ST34501WD, ST34501DC, ST34501WC, ST34501N Cable characteristics for single-ended circuits

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24

Cheetah 4LP Installation Guide, Rev. B

Figures 3a, 3b, 3c, and 3d show typical drive connections. The following table lists the maximum cable lengths and number of devices with single-ended I/O circuits allowed on a daisy-chain cable for 5 and 20 Mbytes/sec I/O data transfer rates.

Table 4. Cable characteristics for single-ended circuits

I/O transfer

Maximum number of

Maximum cable

rate

devices on line

length allowed

 

 

 

 

 

5

Mbytes/s

8

(reg. SCSI bus)

6 meters (19.7 ft.)

 

 

 

 

 

5

Mbytes/s

16

(wide SCSI bus)

6 meters (19.7 ft.)

 

 

 

 

 

20

Mbytes/s

4

(reg. SCSI bus)

3 meters (9.8 ft.)

 

 

 

 

 

20

Mbytes/s

8

(reg. SCSI bus)

1.5 meters (4.9 ft.)

 

 

 

 

 

20

Mbytes/s

 

(wide SCSI bus)1

1

1See system documentation. ANSI spec does not specify a value here.

For devices having differential I/O circuits, a maximum cable length of 25 meters (82 feet) is allowed. A maximum of 8 devices can be connected on an 8-bit wide data bus, and a maximum of 16 devices can be connected on a 16-bit wide data bus.

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Contents ST34501N/W/WC/WD/DC Contents Preface Electrostatic discharge protection Important safety information and precautions Cheetah 4LP Installation Guide, Rev. B Wichtige Sicherheitshinweise Cheetah 4LP Installation Guide, Rev. B Page Electromagnetic compliance Regulatory agency complianceElectromagnetic susceptibility Electromagnetic compliance for the European Union Australian C-TickSeagate technical support services Online servicesSeagate CompuServe forum FAX services SeaFAXDirect-support services Seagate technical supportCustomer service centers Manufacturer’s representativesGeneral description Drive characteristics Additional drive characteristics DC power requirements Amps ST34501 WC models WD, DC models +12V8 +5V8 Voltage regulation5 ± 5% ± 5%2Dimensions of the drive Drive models General informationScsi ID jumpers Drive termination Terminator power Circuits and data path widthsCable characteristics for single-ended circuits Pin I/O connection to drive Multiple drive connection to host adapter Multiple-drive connection to host adapter Scsi I/O Providing adequate cooling Kühlung des Systems Suggested air flow Abbildung 4. Empfohlener LuftstromverlaufMounting the drive and connecting cables Installation des Laufwerkes und Anschluß der KabelPage Pin Power Pin GleichstromHinweis Cheetah 4LP Installation Guide, Rev. B Mounting configuration dimensions Formatting the drive Quick reference desktop system notesSetting the Scsi ID jumpers Setting the Scsi ID on model N drivesTerminating the drive Terminating the driveSetting terminator power jumpers Other applicable jumper options Additional jumper optionsWD drives Model W and WD drive alternate ID select and LED connection Terminating the drive W model shown Drive Front Other option jumpers are available as illustrated below WC/DC drives Applicable jumper options Jumper optionsDrive Active indicator Drive Active LED indicator connectionsPage Page