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4
Orient the SNC so that the SCSI ports are on the bottom and the handle is on the left.
5
Slide the SNC into the bay until it matches with the connector and power receptacle. Then tighten the
thumbscrews.
6
Ensure that the AC power cord is plugged into the proper AC source outlet.
The SNC should be left on to keep the battery charged. If the SNC is left
Note
unpowered for long periods of time, you may need to reset the time and date.
For instructions, refer to
Connecting the SCSI Ports
SNC SCSI ports are used to connect SCSI storage devices (drives) and media changers. Each SCSI port
is independent from the other SCSI port.
Because each bus is independent, each bus is capable of supporting 15 devices and transfer rates of 40,
80, or 160 MB/sec. (Ultra, Ultra2, or Ultra3). When using a SNC 4500 or SNC 4501, one tape drive per SCSI
bus is recommended for the Scalar 24 and two tape drives per bus is recommended for the Scalar 100.
Each SCSI bus auto-negotiates the appropriate sync rates with connected drives. If slower single-ended
(SE) drives are mixed with faster low voltage differential (LVD) drives, the bus communicates at the rate of
the slowest drive, thus wasting the performance capabilities of the faster drives. Connect slower SE drives
to one SCSI port and connect faster LVD drives to the other port.
Cables and drives must be chosen to maximize performance and minimize the electrical noise from the
high-speed data transfers available with the SCSI protocol. Cabling and termination methods become
important considerations for proper performance. SCSI cables and drives are subject to specific length and
number limitations to deal with electrical problems that arise at increased operating speeds.
SNC 450x User's Guide
Setting the Date and Time
on page 26.
11
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