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I replaced R17 on two DaynaPORT E/II-3 cards, changing it from 100K to 200K, and they both now work with my TP-LINK TL-SG1016DE ethernet switch. Image with the location of R17 highlighted attached. Larger resistor values like 220K, 270K, or higher, should also work.

This is by no means the general case, there are cards like the Asante MacCon+IIET that have automatic media detection and don't have this problem. The problem cards I've seen all use the DP83902, which doesn't have built in support for automatic media selection, and then try to add on 10base-T...

Here is a picture of an unmodified DaynaPORT E/II-3, and a schematic I've made. The link detection circuit seems similar to the Asante MC3NB, with R17 setting the timing for link detection. I've ordered some surface mount resistors, when they arrive I will try changing R17 to 220K. There are...

Here is what I have done to fix an Asante MCiLC. The card I have looks like it was designed for both TP and coax, but then a version of it was made with the coax components removed. Unfortunately that version still has the media detection and switching circuitry present, which suffers from...

Here are schematics I've made of the media sections of the Rev B2 and Rev G To do a full conversion of a Rev G to remove coax and the problematic TP link detection circuit, it looks like the AUI/TPI pin of the DP83902 can be connected to the AUI detection circuit by removing the link at R45...

Another solution, the problematic link detection circuit can be made to work by changing R28 from 36K to 220K. This increases the time allowed between detected link pulses to be long enough to allow for Auto MDI-X. I've tested this on a Rev B2 and a Rev G card, with a TP-Link TL-SG1016DE...

I have a Rev G I also want to modify. Your hack is good, it is the most direct way to force TP only. One refinement I think makes sense, is to actually install JP1. The way JP1 appears to work is to disable the coax circuitry when it is installed. With JP1 off it is dynamically disabled by the...

There is probably a way to modify the Rev G so that the jumper JP1 can still switch between AUI and TPI. With the Rev B1, do you know if it auto switches between AUI and TPI, or does that have to use the jumper JP1? The problem with cards like these not working with anything but old ethernet...