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Disk Drive Bay
The disk drive bay includes the disk drive cage and a Small Computer Systems Interface (SCSI)
backplane. This assembly is always replaced as one unit.
The SCSI backplane is a Low Voltage Differential Signal (LVDS) SCSI compliant backplane. It
is designed to connect up to four SCSI devices to a system in which the backplane is installed.
These SCSI devices must use the Single Connection Attach (SCA)-2 connectors that incorporate
connections for power and status lines, as well as the signals comprising the wide SCSI bus.
Cable Routing and Pinouts
The following picture shows the jumpers on the SCSI backplane.
J7
J21
J15
J1
J9
J8
SCSI drive connection is made through connectors J1 – 4. These are the only connectors on the
front of the backplane. Connection for an optional SCSI Accessible Fault-Tolerant Enclosure
(SAF-TE) card is through J18, which is a 72-pin SIMM connector.
CAUTION
J18 is designed to connect only to a SAF-TE card. Do not connect a single inline
memory module (SIMM) to this location.
J15 and J14 are the 68-pin SCSI connectors for connecting the backplane to an LVDS SCSI
controller. J15 is the input connector. J14 is only used to daisy-chain multiple disk drive bay
backplanes.
J5, J6,
J10, J11
J2
J3
J18
J17
J20
J16
U7, U8, U9
J19
J4
J14
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