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Chapter 4: Controller Connections and Operation
SentinelRAID Connection 4-1
Chapter 4
Controller Connections and
Operation
4.1. SentinelRAID Connection
4.1.1 I/O Channel Configuration
All of the I/O channels can be configured as either host channels or drive channels. Note
that at least one I/O channel on the SR 170 controller must be configured as a host
channel and the other channels can all be configured as drive channels.
4.1.2 SCSI Cables
Separately purchased SCSI-320 compatible cables, not longer than 12 meters, must be
used for host and drive connection. Purchase SCSI-320 cables of the highest quality
produced by a reputable manufacture. It is necessary to use proper, high quality, durable
SCSI-320 cables in order to ensure optimum SR controller performance. Failure to do so
will result in downgraded performance.
SCSI cables that are used to connect the SR 170 controller to external SCSI-320 devices
should be in compliance with the specifications shown in Table 4-1.
Electrical
Impedance
120ΩΚ10%
Capacitance 15.9 pf / ft @ 1MHz
Propagation Delay 1.59ns / ft nom
DC Resistance
95Ω / 1000 ft @ 20°C
Delay Skew 0.035ns / ft (max.)
Table 4-1: SCSI-320 Cable Electrical Specifications
4.1.3 Host Connection
I/O channels configured as host channels can be connected to a SCSI-320 host computer
using an industry-standard SCSI-320 cable.