ARLINGTON, Va.--(BUSINESS WIRE)--The Telecommunications Industry Association (TIA), the leading association representing the manufacturers and suppliers of high-tech communications networks, today announced that the TIA Board of Directors has approved eight companies as new members, including the addition of AT&T and Comcast. The approval of these new members follows the appointment of Scott Belcher as Chief Executive Officer (CEO) late last year, along with the addition of a new CTO, Senio