On Aug 19, 12:10, Mike Ford wrote: back card? Almost certainly. The RJ45 will be 10baseT and the DA15 will be an AUI connector (sometimes called 10base5 because they'd often be connected by a drop cable to a thick wire transceiver, but in fact you could connect a 10base2 or 10baseT transceiver instead). There may be links to set which is the active port, though modern cards sometimes do that under software control, or autodetect a live link on the 10baseT when they power up. The AUI connector usually has a clip mechanism rather than screwposts, though. An ordinary miniature transceiver won't fit onto the screwposts. The only other cards you're likely to see that are similar, is a few old ISDN cards. They have an RJ45 for the S-bus (ISDN) connection, and one make did use DA15 for a serial port, but they always had one more modular jack (or 600-series jack) for a phone, too. They usually have a large (2-3" x 3-4") covered section with the telecomms section isolated inside it. Ethernet cards usually have a much smaller (1" square or so) monolithic voltage converter/isolator to generate the isolated 10V supply for the network driver. -- Pete Peter Turnbull Dept. of Computer Science University of York