Seagate ST423451N/W/WD manual Terminating the drive ST423451W shown

Page 41

Elite 23 Installation Guide, Rev. A

39

W/WD drives

Terminating the drive

ST423451W drives are terminated with permanently mounted IC active terminators. If you install one of these drives and it is not on the end of the SCSI bus, disable the terminators by removing the TE jumper from pins 19 and 20 of connector J4A. If you install the drive on the end of the SCSI bus, enable termination by installing a jumper on pins 19 and 20 of connector J4A (see Figure 12).

Note. Use active (ANSI SCSI-2 Alternative 2) terminators when terminating the bus.

ST423451WD drives do not have internal terminators or any other way of adding internal termination to the drive. You must provide external differential termination to these drives when ter- mination is required.

J4A

Pin 1

J4B

Pin 1

J4A	Pin 19
J4A
Pin 1

Terminator Enabled (TE)

Terminator Disabled (TE)

Figure 12. Terminating the drive (ST423451W shown)

Image 41

Contents Elite Disc Drive ST423451N/W/WD Contents Electrostatic discharge protection PrefaceImportant safety information and precautions Page Wichtige Sicherheitshinweise Page European Union Compliance Page SeaNET Seagate Technology Online servicesSeaFONE at 1-800-SEAGATE Seagate Technology Forum on CompuServe SeaBOARDBBS Location Modem number SeaFAX Seagate Technology FAX servicesLocation Telephone number Seagate technical support FAXSeaTDD Seagate technical support lineGeneral description Drive characteristics Elite 23 Installation Guide, Rev. a Dimensions of the drive General information Drive modelsScsi ID jumpers Drive termination Circuits and data path widths Terminator powerCable characteristics for single-ended circuits Fifty-pin I/O connection to drive Multiple drive connection to host adapter Multiple-drive connection to host adapter Providing adequate cooling Kühlung des Systems Suggested air flow Abbildung 4. Empfohlener Luftstromverlauf Installation des Laufwerkes und Anschluß der Kabel Mounting the drive and connecting cablesElite 23 Installation Guide, Rev. a Pin Gleichstrom Pin PowerHinweis Page Mounting configuration dimensions Quick reference desktop system notes Formatting the driveSetting the Scsi ID on N models Setting the Scsi ID jumpersTerminating the drive Terminating the driveSetting terminator power jumpers on N models Additional jumper options Other applicable jumper optionsWD drives Terminating the drive ST423451W shown Setting terminator power jumpers on W models Other option jumpers are available as illustrated below LED indicator connections for all drive models Active, Ready, and Fault indicatorsPage Page