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SentinelRAID 170 Installation and Hardware Reference Manual
1-8 Optional Items
1.4.2 SCSI Cables
SCSI cables are required to connect the 68-pin connectors on the backplane to the SCSI-
320 drives and SCSI-320 hosts. When purchasing SCSI-320 cables, select cables of the
highest quality that are produced by a reputable manufacturer. To ensure optimum SR
controller performance it is necessary to use proper, high quality, durable SCSI-320
cables. Failure to do so will result in downgraded performance. Please contact the SR
controller vendor for a list of compatible cables.
1.4.3 Power Connector
Two four-pin power cord connectors are located on the right and left sides at the back of
the controller board. These connectors facilitate the power supply connection.
1.4.4 I
2
C Signal Compatible Cables
These cables are required for enclosure device monitoring.
1.5. Optional Items
1.5.1 Battery Backup Unit (BBU)
The controller operates using cache memory. However, if the controller operates with
write-back caching and a power failure occurs, the cache memory may contain buffered
data that has not been made permanent on hard disks.
The buffered data is not retrievable when power returns unless backup power has been
provided. The combination of the optional, separately purchased IFT-9070D battery
charger board (Figure 1-7) and IFT-9010D BBU module (Figure 1-6) allows two battery
packs to be daisy-chained for longer backup time and each BBU can sustain the cache
memory for 72 hours. The IFT-9519D extension cable can be used to cascade multiple
cell packs or to extend the connection between the controller and cell pack.
Each battery in the cell pack has a storage capacity of 3A/H when fully charged, and
three cells are used for a total of 3.6V source. The charger circuit on the IFT-9070D
provides a 160mA charge until either a ninety-minute time limit has been surpassed or
the temperature limit of 65ºC is reached. After fast charging, the charger will shift to a
trickle stage until the charge is full.