Infortrend SentinelRAID 170 320ML/sec SCSI-to-SCSI RAID Controller manual SentinelRAID Connection

Chapter 4: Controller Connections and Operation

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.

SentinelRAID Connection 4-1