About The Standard Ethernet Port - Sun Microsystems Enterprise 250 Owner's Manual

Two LED indicators on the rear of the power supply display power status and fault
conditions. For additional details, see "Power Supply LEDs" on page 259.
Note -
Enterprise 250 power supplies will shut down automatically in response to
certain over-temperature and power fault conditions (see "Environmental Monitoring
and Control" on page 71). To recover from an automatic shutdown, you must
disconnect the AC power cord, wait roughly 10 seconds, and then reconnect the
power cord.

About the Standard Ethernet Port

The system's main logic board provides an auto-sensing, switchable 10BASE-T/
100BASE-TX Ethernet interface conforming to the IEEE 802.3u Ethernet standard. The
interface configures itself automatically for either 10-Mbps or 100-Mbps operation,
depending on network characteristics.
Two rear panel connectors provide access to the Ethernet interface:
4 One RJ-45 connector for connecting a category-5 twisted-pair Ethernet (TPE) cable
4 One Media Independent Interface (MII) connector for connecting an external
MII transceiver
Note -
You can use only one of the main logic board Ethernet connectors;
you cannot connect to the TPE and MII connectors at the same time.
The Media Independent Interface lets you connect the system to a variety of external
100BASE-TX (Fast) Ethernet transceivers, providing compatibility with different
Ethernet wiring types. When an external transceiver is connected to the MII, the
system automatically activates the MII port and disables the TPE port.
Sun Microsystems offers an MII-to-AUI transceiver as a separately orderable option
(order number X467A). A number of third-party MII transceivers are also available
for connecting to TX, T4, FX, and AUI-type Ethernet networks.
For instructions on configuring the main logic board Ethernet interface, see "How to
Configure the Standard Ethernet Interface" on page 196.
For connector diagrams and pin assignments, see "Reference for the Twisted-Pair
Ethernet (TPE) Connector" on page 283 and "Reference for the Media Independent
Interface (MII) Ethernet Connector" on page 284.
For information about operating characteristics and configuration parameters for the
hme Fast Ethernet device driver, please see Platform Notes: The hme Fast Ethernet
Device Driver. This document is available on Solaris on Sun Hardware AnswerBook,
which is provided on the SMCC Supplement CD for the Solaris release you are
running.
89
Hardware Configuration