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System Cabling Configurations C-3
BSU Cable Configuration
The BSU is cabled using a single channel on-board IDE Controller and dual
channel on-board Adaptec 7899 SCSI Controller.
The on-board IDE controller supports the standard internally mounted CD-ROM
as its master device.
The AIC 7899 contains two independent SCSI channels that share a single PCI
bus master interface. Each channel is capable of operations using either 8- or 16-
bit SCSI providing 160 MB/s (Ultra 160/m) or 80 MB/s (Ultra2-Wide)
throughput. As implemented on the system I/O board controller B attaches to an
Ultra-160/m SCSI backplane that supports up to two 160/m SCA drives.
Controller A can be used to support SCSI devices in the 5 1/4-inch removable
media bays. A 68 pin to 50 pin converter is also available to be used when
installing SCSI narrow devices.
A 3.5-inch floppy diskette drive is also installed in the system and interfaces
separately to the I/O riser board, which is plugged into the system I/O board.
Referring to Figure C-1 a 68-pin Ultra-160/m SCSI interface cable (K) is
connected to the SCSI connector (L) on the system I/O board. This cable
connects to the rear of the hard disk drive's SCSI backplane (H). Another 68-pin
Ultra-160/m SCSI interface cable (Q) is connected to the SCSI connector (P) on
the system I/O board. This cable connects to an external SCSI connector (S)
located on the rear of the BSU chassis.
The IDE interface cable (G) is connected to the IDE connector (M) on the
system I/O board. This cable connects to the rear of the internally mounted CD-
ROM drive (F).
Optional internally mounted SCSI removable media devices (A) may be
connected to the SCSI controller connector (N) with Ultra2-Wide SCSI interface
cable (B).
The diskette drive interface cable (D) is connected to the diskette drive
connector (O) on the I/O riser board. This cable connects to the rear of the
internally mounted diskette drive (C).