IBM eServer 250 xSeries, Руководство пользователя

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IBM® xSeries 250: User’s Reference
Ultra2 (LVD) SCSI ports
Your server supports an optional IBM ServeRAID adapter. This adapter provides
three independent SCSI channels. A 16-bit (wide) LVD SCSI cable connects the hard
disk drive backplane to one channel of the ServeRAID adapter. Two 68-pin SCSI
connectors for two additional channels are on the rear of the server. Refer to the
information that comes with your ServeRAID adapter for additional details.
Your server has a dual-channel Ultra2 small computer system interface (SCSI)
controller. This controller supports two independent SCSI channels: one external and
one internal. Each channel supports up to 15 SCSI devices. You can use the external
LVD SCSI channel connector on the rear of your server to connect different types of
SCSI devices, such as drives or printers.
SCSI cabling requirements
If you plan to attach external SCSI devices, you must order additional SCSI cables. To
select and order the correct cables for use with external devices, contact your IBM
reseller or IBM marketing representative.
For information about the maximum length of SCSI cable between the terminated
ends of the cable, refer to the American National Standards Institute (ANSI) SCSI
standards on the ANSI Web site at http://www.ansi.org on the World Wide Web.
Adhering to these standards will help ensure that your server operates properly.
Pin Signal
1 Data
2 Not connected
3 Ground
4 +5 V dc
5 Clock
6 Not connected
Table 9. Auxiliary-device connector pin-number assignments.