Acer AcceleRAID 352 ユーザーズマニュアル

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Installation Process
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AcceleRAID 352 Installation Guide
6. Termination - Only Internal or Only External Devices 
Check that the drive channel is properly terminated according to 
drawings below. The AcceleRAID 352 controller is equipped with 
automatic SCSI termination circuitry which handles automatic 
enabling and disabling of on-board termination. For example, if the 
controller is at the end of the SCSI bus, it automatically enables 
on-board termination.
If all the SCSI devices on a channel are connected either to the 
internal connector or
 to the external connector, the end of the SCSI 
bus farthest from the controller must have a terminator installed; the 
controller automatically enables on-board termination.
See Figure 2-10 for an example of an internal drive configuration. 
See Figure 2-11 for an example of an external drive configuration.
Figure 2-10. Termination with Internal Drive Configuration
Figure 2-11. Termination with External Drive Configuration