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Forum: 3Com PCMCIA Ethernet Adapter Issues
Re: Question What do "flipped to 10baseT" and "lost link beat" mean? (Steve Snyder)
Date: 2000, Jun 21
From: David Hinds <dhinds@pcmcia.sourceforge.org>

The "lost link beat" message means that the 3C562 reported that it was
no longer seeing a valid 10baseT link beat signal.  The "flipped to
10baseT" messages mean that the driver was probing the transceiver
type (10base2 or 10baseT) and settled on 10baseT after detecting a
link beat.

If you will always be using 10baseT for this card, you can set that
explicitly in /etc/pcmcia/network.opts (IFPORT="10baseT").  The driver
will still report if it sees the link beat come and go, but will not
ever try to autodetect 10base2 versus 10baseT.

I'm not sure what the deal is with why you might be losing link beat.
Maybe it is a feature of your SDSL router; maybe it drops link beat
when it is having connection problems on the SDSL line?

In any case, I don't think the transceiver messages are a major
problem.  If the driver sets the transceiver incorrectly, it would not
cause degraded performance: you would see no traffic at all.

I'd think your 486 would be able to handle this network load since one
side is effectively throttled to 192 kb/sec.  You can also watch your
ifconfig stats for receive overruns.

-- Dave

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