10/100Mbps Link Up Using Mii Interface Connector; Link Integrity Test - Sun Microsystems SunFastEthernet Adapte User Manual

Sun microsystems user's guide sunfast ethernet adapter

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5.1.2 10/100Mbps Link Up Using MII interface Connector

5-2

Note – If you do not see a "10 or 100Mbits/sec Link Up" message, then the

link is down and the probable cause could be a disconnected cable, transceiver

or hub.

If your SunFastEthernet channel is connected to a 10 or 100 Mbps network

through the MII interface connector you will receive a Link Up message

whenever you boot the system or disconnect and then reconnect to the

network.

For 10Mbps the message is:

# be<num>: Using External Transceiver

10 Mbits/sec Link Up

For 100Mbps the message is:

# be<num>: Using External Transceiver

100 Mbits/sec Link Up

Note – If you do not see a "10 or 100Mbits/sec Link Up" message, then the link

is down and the probable cause could be a disconnected cable, transceiver or

hub.

The link integrity test feature is always enabled on SunFastEthernet cards. The

link integrity test feature is a requirement of the IEEE 10Base-T standard. The

purpose of the test feature is to enable a 10Base-T node to detect a link failure.

The standard requires that on a periodic basis, each station on the net transmit

link pulses whenever it is not transmitting valid packets. Sampling the link

pulses, the receiver will assume that the network connection (link) is intact and

assumes a link pass state.

SunFastEthernet Adapter User Guide—November 1994

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