I think it's really a second data modem (not a second router) where Xfinity Home's router uses its own (the second data) modem to access the Internet (Xfinity would have to provision that modem and NOT CHARGE YOU FOR THE MODEM OR INTERNET CONNECTION FOR IT AS THE NEED IS FOR XH TO FUNCTION WITHOUT DESTROYING THE FUNCTIONALITY OF Xfinity Internet). This isolates the XH connection from your XI connection, and eliminates its interference with same.