I am actually going to go ahead and confirm this. And it is actually really good to know, because I feel like the 3 con 1/8" jacks are much easier to find than the 3, even though I know URC uses the 4 con (with a dead RD (the tip)).
Here's what I have.
Elan HA-CB-308 (DB9 Female to RJ 45).
With a cat 5 terminated T568A, the pin out would be:
pin 2 = white blue pin 3 = orange pin 5 = blue
(if you prefer B)
pin 2 = white blue pin 3 = green pin 5 = blue
I have a URC standard 3.5mm"-3.5mm" stereo mini cable used for their RF antennas. It pins out as follows: (Top to bottom)
Tip: White Ring 1 = Red Sleeve = Black
So to my cat 5:
white to white blue red to orange black to blue.
Connect with Keyspan USA-19HS and have a functional pronto TS1000 replacement cable.
I'm sure everyone's been holding their breath since 1998. I certainly appreciate the help as my ring #1 stopped working on my pronto cable.