8.1.2Function description
J2 |
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jumper |
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installation | Jumper function description |
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SE |
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On |
| Forces drive to use | |
Off |
| Drive can operate on the interface in low voltage differential mode or | |
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| ing on the voltage state of the I/O “DIFFSNS” lineDefault. | is SE jumper not installed. |
DS | ME |
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Off | Off | Spindle starts immediately after power up - Default setting. | |
Off | On | Drive spindle does not start until Start Unit command received from host. | |
On | Off | Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0 | |
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| spindle starts immediately when DC power connected, drive 1 starts after 12 second delay, | |
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| drive 2 starts after 24 second delay, etc. |
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On | On | Drive spindle starts when Start Unit command received from host. Delayed start feature is | |
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| overridden and does not apply when ME jumper is installed. | |
WP |
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On |
| Entire drive is write protected. |
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Off |
| Drive is not write protected. Default is WP jumper not installed. | |
PD |
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On |
| Parity checking and parity error reporting by the drive is disabled. | |
Off |
| Drive checks for parity and reports result of parity checking to host. | |
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| Default is PD jumper not installed. |
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RES |
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Off |
| Reserved jumper position. Default is no RES jumper installed. | |
TP |
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Off |
| The drive does not supply terminator power to external terminators or to the SCSI bus I/O | |
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| cable. |
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On |
| Drive supplies power to SCSI bus I/O cable. When drives have differential I/O circuits, a | |
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| jumper on the TP position may be needed to power external terminators (see system docu- | |
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| mentation). These drives do not have terminator circuits on the drive. | |
Note. | J2 does not exist on LC models and is supported on LW models only. | ||
Cheetah 10K.7 SCSI Product Manual, Rev. D | 49 |
