But your reference to the DB-15 port on the same card is puzzling. It sounds as if it is an AUI port, an older standard port style for ethernet. It should have clasps instead of nuts to hold a cable's connector snug and secure. Does it? Farallon's cattle-dog number for the card might help us to diagnose it and help you. Is the other port an RJ-45 (wider than a telephone socket) or an RJ-11?
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As usual, you've provided some great info - thanks again!

Regarding this particular card, it does indeed have an RJ-45 socket, along with a bright green LED that lit up when I plugged in my Ethernet cable (coming from my AirPort Extreme's wired socket), and a DB-15 connection with some funky clasps. Along the top of the card, there's one socketed IC (looks like a standard ROM chip) with a sticker reading "P/N 160126." Also, near the bottom of the card (about an inch in front of the NuBus socket) there's a 3-pin jumper labeled "LINK BEAT E100," and it's currently jumpered in the "ON" position.

Anyway, this card is somewhat curious, as I can't find any reference to that part number on the Net. Again, thanks for your endless patience with my often newbie-level questions. You guys are the best.

Huxley