I wired up a bunch of those in my room. IIRC, it's the T, R, and S lugs that bear the signals from a TRS plug. TN, RN, SN are switching connectors for normalling (eg, TN = "Tip Normaling") When you don't have a 1/4" plug inserted into it, the switches are closed--T connected to TN, etc. When you insert the plug, they disconnect. The switches only work for 1/4" plugs. Inserting an XLR don't affect the normalling switches. (I wish it did--I wanted to use those for a panel of normally hard-wired mic connections that could be overridden by plugging a mic cable into it. Oh well...)

If you are running it to a device that has both line and mic inputs and provides a means to switch between them other than the act of unplugging the line input plug, I'd run separate cables for XLR and TRS. Otherwise, just strap 2 to T, 3 to R and 1 to S and run one.

The G is the XLR shell connection. (Sadly, the ones I have don't actually have a lug in the space marked GN -- it may have come in handly for controlling a switching circuit to make it do what I wanted.)

Hope that helps

--Bob

So, if I'm understanding correctly, dont use the normalling pins at all, just the T,R,S? Do the T,R,S pins conduct both the XLR and TRS?
Also, are you saying wire Pin G to Pin G, or jump to the sleeve pin?

OK -- I had to get the project done last night, so I took a guess. I did jump the pins 1, 2, & 3 to SN, TN, & RN (respectively). I left the ground pins alone. It works like a charm! Phantom power works fine, and you can stick an XLR in one side and a TRS in the other, and it transfers straight through. Thanks all for your help.