I sent a friend a setup to run fiber from his house to his detached garage. Along with the terminated fiber, I sent him 2 Digi MIL-140 media converters. I tested the setup completely before I sent it to him, and he installed everything with no problem. Shortly (2-3 hours?) after his system was up and functional, it locked up on him.

The MIL-140 in the garage is showing a "Collision UTP" red light (which I guess would be losing link on RX), while the one connected to his router (D-Link DIR-655) is not showing any collision.

Should we set the dip switches 2 & 3 on the second unit (garage) to the down position? I can't recall ever having to mess with the dip switches on these, but it's been a while since i worked with them.

I'm gonna let this one simmer for a day or two and see if someone with specific experience answers you or not.

In the meantime, my suggestion is to chase that UTP demon. We all know what TCP's job is and UTP doesn't have the same responsibility.

The other thing to worry about, of course, is what you pushed across on your bench test versus what's really going on in this customer's LAN. I know you're not gonna belive this, but I had a customer called Robertson's Ready-Mix that still had old Windows 95 machines on their network that were broadcasting IPX packets. And this was only like five years ago!

I'd play with dips for a minute and then put WhatsUp Gold or other sniffer in promiscuous mode and find out what the traffic looks like.

make sure your speed and duplex as setup correctly on both sides.

eg. if your media converter is setup to auto make sure the equipment connected to it is set to auto. if it's hard set to 100 full make sure the equipment connected to it is also set to 100 full. typically you see collisions when there is a speed/duplex mis match.

Look at the note on page 5 about the DIP switches.

ftp://ftp.milan.com/pub/MCSys/manuals/man140RM.pdf

Just curious but why did you install 10 meg converters?