APC RAID Subsystem SCSI-SATA II Specifications Page 18

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Chapter 1: Introduction
1.2.4 Controller Module Interfaces
All I/O and management interfaces that connect to external devices are located on the
controller module faceplate. The interfaces are listed below.
VHDCI ports: The subsystem’s two (2) host channels are interfaced through four
(4) VHDCI ports. Although an ordinary SCSI bus has no direction criteria, due to
the internal trace layout design, connection to the SCSI ports should be made as
follows:
IN ports: connects to SCSI initiators (including clustered servers)
OUT ports: connects to a cascaded enclosure
Another consideration is that you should disable SCSI bus termination if your SCSI
port is not the last device on a SCSI bus and the termination has been activated
through firmware configuration settings. Please refer to the associated discussion
in Chapter 4.
RS-232C (Audio Jack): All controller modules come with two (2) RS-232C (audio
jack) serial ports. The serial ports can be used for terminal emulation and
uninterruptible power supply (UPS) support.
Ethernet port: A single 10/100BaseT Ethernet port is used for remote management
through a TCP/IP network.
Drive: All models come with twenty-four (24) SATA drive channels that are
connected to the backplane through back-end connectors. (NOTE: Drive interfaces
are not accessed through the controller module faceplate.)
1.2.5 DIMM Module
Each controller module comes with a pre-installed 256MB DDR RAM DIMM module.
The controller module supports memory modules with sizes from 256MB to 2GB. The
DIMM module is mounted on the controller board within a metal chassis.
Subsystem Components
1-9
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