I don't really have any working DCC links, only because I have been using it for 25 years and the links are gone dead, but there are groups for the different systems out there. I used to follow the NCE DCC Yahoo group, and the JMRI Yahoo group, but those are all defunct now with the end of Yahoo Groups. Here on Trainboard there is a DCC forum that has stuff going back almost 20 years. The key thing to remember about Z Scale DCC, is other than the decoder size, it's the same DCC as other scales use. Some people also fear motor damage and lower the DCC voltage by using diodes inline with the DCC track power.