NEC NEAX Express, User Manual

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System Overview 1-7
Power Supply
The ATX300 watt power supply is switch-selectable for 115 or 230 Vac at an operating
frequency of 50/60 Hz. It is designed to comply with existing emission standards and
provides sufficient power for a fully loaded system configuration. The power supply
voltage selection switch is factory set to 115Vac for systems used in the United States;
it is set to 230Vac for systems used in Europe.
Peripheral Bays
The system supports a variety of standard PC AT-compatible peripheral devices. The
chassis includes these peripheral bays:
„
A 3.5-inch front panel bay for mounting the standard 3.5" diskette drive (supports
720 KB and 1.44 MB diskette media)
„
Four 5.25-inch removable media front panel bays for mounting half-height 5.25-inch
peripheral devices: standard CD ROM drive and optional tape drives, etc.
„
Seven hot-swap SCSI hard disk drive bays for mounting up to seven SCSI hard disk
drives in easily removable drive carriers.
Note: The SCSI hard disk drive bays contain a hot-swap back
plane that require an 80-pin single connector attachment (SCA)
connector on the drives that you install.
SAF-TE Board
The system has a SAF-TE (SCSI Accessed Fault Tolerant Enclosure) board that
provides an interface for the disk subsystem to automatically integrate with peripheral
packaging that supports status signals, hot swapping drives, and enclosure monitoring.
The transport mechanism for the standardized alert detection and status reporting is the
SCSI bus. Disk drives, power supplies, cooling fans, and temperature are continually
monitored and the conditions then reported over the SCSI bus to the system. When used
with RAID management software the user can be alerted of impending or imminent
disk conditions requiring attention. This allows the user to react to conditions that could
normally go unnoticed until data loss.
System Board Features
The system board offers a “flat” design with the processor and memory subsystems
residing on the board. This figure shows the major components on the system board.
The following subsections describe the system board major components.