I used CAT5 in my own house to connect numerous APADs. Crestron has a specific data sheet for this connection. I suggest you go online or contact support to get a copy. As mentioned in an earlier post, they specify sharing pairs for power, but I’m not sure about data.

I do NOT love the APAD as an interface. They have the new TPMC-4SM that is POE, is designed for a single CAT5 and will blow the doors off the APAD if you can handle the price. Did I mention that I didn’t love the APAD? I meant to say, I can’t imagine ever designing one into a new job.