> -----Original Message-----
> From: pic microcontroller discussion list
> Subject: Re: [EE]: Faulty 100 mBps Ethernet LAN - Help desparately
> needed


> He does have the software disc that comes with the network cards,
> right? My
> memories of dealing with 3Com cards is that there is diagnostic
> software on
> the disk or CD that will test the card in the machine. One of the
> tests is a
> loopback test, which does an internal loopback connection within
> the card so
> that it can test the transmit encoding/receive decoding without going out
> onto the cable.
>
> If that works alright, then change the port on the hub he is connected to.
> If he now works OK then the port on the hub is stuffed, else his network
> card is stuffed. Between those two items you know if it is the hub or
> network card and it cannot be anything else as everyone else works
> correctly.
>

If he has the disk / CD, it should also have an option in the test utility
to run a local and remote loop back, in remote loop back the same software
is run on two machines (ideally the server and his pc) and shows errors that
occur when the two communicate. I have never used 3 com cards, I use ACER
and aopen (although supplier has changed their brands) and sometimes SMC,
and all had the diagnostic utilities.

Regards,

Kat.


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