Sun Microsystems Enterprise 250 Owner's Manual page 21

A 5.25-inch half-height (1.6-inch) bay is provided at the front of the system, which
may be used to house a removable media SCSI device—such as an 8-mm tape drive,
a 4-mm DDS-2 or DDS-3 tape drive, or a quarter-inch cassette tape drive. For
additional details, see "About the SCSI Removable Media Bays and the External
SCSI Port" on page 67.
Up to four external tape devices can be attached to the standard 68-pin Fast/Wide
SCSI port provided on the system's rear panel. Additional external tape devices can
be supported with appropriate PCI host adapter cards.
The Enterprise 250 server can easily be connected to either a 10-Mbps or a 100-Mbps
Ethernet by means of an auto-sensing Ethernet interface provided on the system's
main logic board. Additional Ethernet interfaces or connections to other networks,
such as FDDI, ATM, or token ring, can be provided by installing the appropriate PCI
interface cards. For more information, see "Administration and Networking" on
page 171.
The system console device can be either a standard ASCII character terminal or a
local windowing subsystem. The ASCII terminal connects to the one of the system's
two serial ports, while a local graphics console requires installation of a PCI frame
buffer card, monitor, keyboard, and mouse. System administration can also be
performed from a remote workstation connected to the Ethernet.
The Enterprise 250 server provides two serial communications ports through a pair
of DB-25 connectors located on the rear panel. It also provides one external, 2-Mbyte
per second, bidirectional, Centronics-compatible, EPP parallel port for connecting
the system to a local printer or other compatible parallel device.
Power is provided by one or two 360-watt power supplies. System configurations
with two power supplies provide both N+1 redundancy and full hot swap
capability. For more information about the power supplies, see "About Power
Supplies" on page 57.
The Enterprise 250 server can easily be installed in a standard 19-inch rack.
An optional rackmounting kit is available for installing the server into any 29- to
34-inch deep EIA 19-inch rack with at least 6 rack units (10.5 inches) of vertical
mounting space and sufficient load-bearing capacity.
System reliability, availability, and serviceability are enhanced by features
that include:
Error correcting code on memory and all data paths
Parity checking on all address buses
Front panel status indicator lights
Disk drive health indicator lights
Hot-pluggable disk drives with easy front access
Support for RAID 0, 1, and 5 implementations
Chapter 1 System Overview 3